java.lang.Object
- java.lang.Enum<Keyword>
- - org.orekit.files.ccsds.Keyword

All Implemented Interfaces:

Serializable, Comparable<Keyword>
```
public enum Keyword
extends Enum<Keyword>
```
Keywords for CCSDS Navigation Data Messages.
Only these should be used.
The enumeration is split in 3 parts:
- Common NDM keywords;
- Orbit Data Messages (ODM) specific keywords;
- Tracking Data Messages (TDM) specific keywords.
References:
- CCSDS 502.0-B-2 recommended standard ("Orbit Data Messages", Blue Book, Issue 2.0, November 2009).
- CCSDS 503.0-B-1 recommended standard ("Tracking Data Message", Blue Book, Issue 1.0, November 2007).

Since:

6.1

Author:

sports, Maxime Journot

Enum Constant Summary

Enum Constants
Enum Constant	Description
`ANGLE_1`	Data: ANGLE_1 in degrees and in [-180, +360[ [deg].
`ANGLE_2`	Data: ANGLE_2 in degrees and in [-180, +360[ [deg].
`ANGLE_TYPE`	Meta-data: The ANGLE_TYPE keyword shall indicate the type of antenna geometry represented in the angle data (ANGLE_1 and ANGLE_2 keywords).
`ARG_OF_PERICENTER`	Orbit argument of pericenter.
`body`	Body keyword.
`BSTAR`	SGP/SGP4 drag-like coefficient.
`CARRIER_POWER`	Data: Carrier power [dBW].
`CCSDS_OEM_VERS`	File creation date in UTC.
`CCSDS_OMM_VERS`	CCSDS OMM format version.
`CCSDS_OPM_VERS`	CCSDS OPM format version.
`CCSDS_TDM_VERS`	Header: TDM format version in the form of ‘x.y’, where ‘y’ shall be incremented for corrections and minor changes, and ‘x’ shall be incremented for major changes.
`CENTER_NAME`	Origin of reference frame.
`CLASSIFICATION_TYPE`	Classification type.
`CLOCK_BIAS`	Data: Clock bias [s].
`CLOCK_DRIFT`	Data: Clock drift [s/s].
`COMMENT`	Comments specific to a ODM file.
`CORRECTION_ANGLE_1`	Meta-data: Correction angle 1.
`CORRECTION_ANGLE_2`	Meta-data: Correction angle 2.
`CORRECTION_DOPPLER`	Meta-data: Correction Doppler.
`CORRECTION_RANGE`	Meta-data: Correction Range.
`CORRECTION_RECEIVE`	Meta-data: Correction receive.
`CORRECTION_TRANSMIT`	Meta-data: Correction transmit.
`CORRECTIONS_APPLIED`	Meta-data: Correction applied ? YES/NO
`COV_REF_FRAME`	Coordinate system for covariance matrix.
`COVARIANCE_START`	This keyword must appear before the first line of the covariance matrix data.
`COVARIANCE_STOP`	This keyword must appear after the last line of the covariance matrix data.
`CREATION_DATE`	CCSDS OEM format version.
`CX_DOT_X`	Covariance matrix [4, 1] element.
`CX_DOT_X_DOT`	Covariance matrix [4, 4] element.
`CX_DOT_Y`	Covariance matrix [4, 2] element.
`CX_DOT_Z`	Covariance matrix [4, 3] element.
`CX_X`	Covariance matrix [1, 1] element.
`CY_DOT_X`	Covariance matrix [5, 1] element.
`CY_DOT_X_DOT`	Covariance matrix [5, 4] element.
`CY_DOT_Y`	Covariance matrix [5, 2] element.
`CY_DOT_Y_DOT`	Covariance matrix [5, 5] element.
`CY_DOT_Z`	Covariance matrix [5, 3] element.
`CY_X`	Covariance matrix [2, 1] element.
`CY_Y`	Covariance matrix [2, 2] element.
`CZ_DOT_X`	Covariance matrix [6, 1] element.
`CZ_DOT_X_DOT`	Covariance matrix [6, 4] element.
`CZ_DOT_Y`	Covariance matrix [6, 2] element.
`CZ_DOT_Y_DOT`	Covariance matrix [6, 5] element.
`CZ_DOT_Z`	Covariance matrix [6, 3] element.
`CZ_DOT_Z_DOT`	Covariance matrix [6, 6] element.
`CZ_X`	Covariance matrix [3, 1] element.
`CZ_Y`	Covariance matrix [3, 2] element.
`CZ_Z`	Covariance matrix [3, 3] element.
`data`	Data keyword.
`DATA_QUALITY`	Meta-data: Data quality.
`DATA_START`	Keyword used to delineate the start of a Data block in Keyvalue files.
`DATA_STOP`	Keyword used to delineate the end of a Data block in Keyvalue files..
`DOPPLER_INSTANTANEOUS`	Data: Doppler instantaneous [km/s].
`DOPPLER_INTEGRATED`	Data: Doppler integrated [km/s].
`DOR`	Data: DOR [s].
`DRAG_AREA`	Drag area.
`DRAG_COEFF`	Drag coefficient.
`ECCENTRICITY`	Orbit eccentricity.
`ELEMENT_SET_NO`	Element set number of the satellite.
`EPHEMERIS_TYPE`	Ephemeris type.
`EPOCH`	Epoch of state vector and optional Keplerian elements.
`FREQ_OFFSET`	Meta-data: Frequency offset.
`GM`	Gravitational coefficient.
`header`	Header keyword.
`INCLINATION`	Orbit inclination.
`INTEGRATION_INTERVAL`	Meta-data: Integration interval.
`INTEGRATION_REF`	Meta-data: Integration reference.
`INTERPOLATION`	The interpolation method to be used.
`INTERPOLATION_DEGREE`	The interpolation degree.
`MAN_DELTA_MASS`	Mass change during maneuver (value is < 0).
`MAN_DURATION`	Maneuver duration (If = 0, impulsive maneuver).
`MAN_DV_1`	First component of the velocity increment.
`MAN_DV_2`	Second component of the velocity increment.
`MAN_DV_3`	Third component of the velocity increment.
`MAN_EPOCH_IGNITION`	Epoch of ignition.
`MAN_REF_FRAME`	Coordinate system for velocity increment vector.
`MASS`	Spacecraft mass.
`MEAN_ANOMALY`	Orbit mean anomaly.
`MEAN_ELEMENT_THEORY`	Mean element theory.
`MEAN_MOTION`	Mean Motion.
`MEAN_MOTION_DDOT`	Second Time Derivative of the Mean Motion.
`MEAN_MOTION_DOT`	First Time Derivative of the Mean Motion.
`META_START`	Keyword used to delineate the start of a Meta-data block.
`META_STOP`	Keyword used to delineate the end of a Meta-data block.
`metadata`	Meta-data keyword.
`MODE`	Meta-data: Tracking mode associated with data section of the segment.
`NORAD_CAT_ID`	NORAD catalogue number.
`OBJECT_ID`	Object identifier of the object for which the orbit state is provided.
`OBJECT_NAME`	Spacecraft name for which the orbit state is provided.
`observation`	Observation keyword.
`ORIGINATOR`	Creating agency or operator.
`PARTICIPANT_1`	Meta-data: PARTICIPANT_n, n = {1, 2, 3, 4, 5}.
`PARTICIPANT_2`	Participant 2.
`PARTICIPANT_3`	Participant 3.
`PARTICIPANT_4`	Participant 4.
`PARTICIPANT_5`	Participant 5.
`PATH`	Meta-data: The PATH keywords shall reflect the signal path by listing the index of each PARTICIPANT in order, separated by commas, with no inserted white space.
`PATH_1`	Path 1.
`PATH_2`	Path 2.
`PC_N0`	Data: Carrier power to noise spectral density ratio (Pc/No) [dBHz].
`PR_N0`	Data: Ranging power to noise spectral density ratio (Pr/No) [dBHz].
`PRESSURE`	Data: Pressure [hPa].
`RA_OF_ASC_NODE`	Orbit right ascension of ascending node.
`RANGE`	Data: Range value [km, s or RU].
`RANGE_MODE`	Meta-data: Range mode.
`RANGE_MODULUS`	Meta-data: Range modulus.
`RANGE_UNITS`	Meta-data: The RANGE_UNITS keyword specifies the units for the range observable.
`RECEIVE_BAND`	Meta-data: Frequency band for received frequencies.
`RECEIVE_DELAY_1`	Meta-data: Receive delays list.
`RECEIVE_DELAY_2`	Second.
`RECEIVE_DELAY_3`	Second.
`RECEIVE_DELAY_4`	Second.
`RECEIVE_DELAY_5`	Second.
`RECEIVE_FREQ`	Data: Received frequency [Hz].
`RECEIVE_FREQ_1`	Data: Received frequencies [Hz].
`RECEIVE_FREQ_2`	Received frequency 2.
`RECEIVE_FREQ_3`	Received frequency 3.
`RECEIVE_FREQ_4`	Received frequency 4.
`RECEIVE_FREQ_5`	Received frequency 5.
`REF_FRAME`	Name of the reference frame in which the state vector and optional Keplerian element data are given.
`REF_FRAME_EPOCH`	Epoch of reference frame, if not intrinsic to the definition of the reference frame.
`REFERENCE_FRAME`	Reference frame in which data are given: used in combination with ANGLE_TYPE=RADEC.
`REV_AT_EPOCH`	Revolution Number.
`RHUMIDITY`	Data: Relative humidity [%].
`segment`	Segment keyword.
`SEMI_MAJOR_AXIS`	Orbit semi-major axis.
`SOLAR_RAD_AREA`	Solar radiation pressure area.
`SOLAR_RAD_COEFF`	Solar radiation pressure coefficient.
`START_TIME`	Start of total time span covered by:
`STEC`	Data: STEC - Slant Total Electron Count [TECU].
`STOP_TIME`	End of total time span covered by:
`tdm`	TDM first keyword.
`TEMPERATURE`	Data: Temperature [K].
`TIME_SYSTEM`	Time system used for state vector, maneuver, and covariance data.
`TIMETAG_REF`	Meta-data: Timetag reference.
`TRANSMIT_BAND`	Frequency band for transmitted frequencies.
`TRANSMIT_DELAY_1`	Meta-data: Transmit delays list (up to 5).
`TRANSMIT_DELAY_2`	Second.
`TRANSMIT_DELAY_3`	Second.
`TRANSMIT_DELAY_4`	Second.
`TRANSMIT_DELAY_5`	Second.
`TRANSMIT_FREQ_1`	Data: Transmitted frequencies [Hz].
`TRANSMIT_FREQ_2`	Transmitted frequency 2.
`TRANSMIT_FREQ_3`	Transmitted frequency 3.
`TRANSMIT_FREQ_4`	Transmitted frequency 4.
`TRANSMIT_FREQ_5`	Transmitted frequency 5.
`TRANSMIT_FREQ_RATE_1`	Data: Transmitted frequencies rates [Hz/s].
`TRANSMIT_FREQ_RATE_2`	Transmitted frequency rate 2.
`TRANSMIT_FREQ_RATE_3`	Transmitted frequency rate 3.
`TRANSMIT_FREQ_RATE_4`	Transmitted frequency rate 4.
`TRANSMIT_FREQ_RATE_5`	Transmitted frequency rate 5.
`TROPO_DRY`	Data: TROPO DRY [m].
`TROPO_WET`	Data: TROPO WET [m].
`TRUE_ANOMALY`	Orbit true anomaly.
`TURNAROUND_DENOMINATOR`	Meta-data: Turn-around ratio denominator.
`TURNAROUND_NUMERATOR`	Meta-data: Turn-around ratio numerator.
`USEABLE_START_TIME`	Start of useable time span covered by ephemerides data, it may be necessary to allow for proper interpolation.
`USEABLE_STOP_TIME`	End of useable time span covered by ephemerides data, it may be necessary to allow for proper interpolation.
`USER_DEFINED_X`	User defined parameter, where X is replaced by a variable length user specified character string.
`VLBI_DELAY`	Data: VLBI delay [s].
`X`	Position vector X-component.
`X_DOT`	Velocity vector X-component.
`Y`	Position vector Y-component.
`Y_DOT`	Velocity vector Y-component.
`Z`	Position vector Z-component.
`Z_DOT`	Velocity vector Z-component.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static Keyword`	`valueOf(String name)`	Returns the enum constant of this type with the specified name.
`static Keyword[]`	`values()`	Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- Enum Constant Detail
  - COMMENT
```
public static final Keyword COMMENT
```
    Comments specific to a ODM file.
  - CREATION_DATE
```
public static final Keyword CREATION_DATE
```
    CCSDS OEM format version.
  - ORIGINATOR
```
public static final Keyword ORIGINATOR
```
    Creating agency or operator.
  - TIME_SYSTEM
```
public static final Keyword TIME_SYSTEM
```
    Time system used for state vector, maneuver, and covariance data.
  - EPOCH
```
public static final Keyword EPOCH
```
    Epoch of state vector and optional Keplerian elements. Or epoch of a TDM observation.
  - START_TIME
```
public static final Keyword START_TIME
```
    Start of total time span covered by:
    - Ephemerides data and covariance data;
    - Tracking data session.
  - STOP_TIME
```
public static final Keyword STOP_TIME
```
    End of total time span covered by:
    - Ephemerides data and covariance data;
    - Tracking data session.
  - USER_DEFINED_X
```
public static final Keyword USER_DEFINED_X
```
    User defined parameter, where X is replaced by a variable length user specified character string. Any number of user defined parameters may be included, if necessary to provide essential information that cannot be conveyed in COMMENT statements.
  - META_START
```
public static final Keyword META_START
```
    Keyword used to delineate the start of a Meta-data block.
  - META_STOP
```
public static final Keyword META_STOP
```
    Keyword used to delineate the end of a Meta-data block.
  - CCSDS_OPM_VERS
```
public static final Keyword CCSDS_OPM_VERS
```
    CCSDS OPM format version.
  - CCSDS_OMM_VERS
```
public static final Keyword CCSDS_OMM_VERS
```
    CCSDS OMM format version.
  - CCSDS_OEM_VERS
```
public static final Keyword CCSDS_OEM_VERS
```
    File creation date in UTC.
  - OBJECT_NAME
```
public static final Keyword OBJECT_NAME
```
    Spacecraft name for which the orbit state is provided.
  - OBJECT_ID
```
public static final Keyword OBJECT_ID
```
    Object identifier of the object for which the orbit state is provided.
  - CENTER_NAME
```
public static final Keyword CENTER_NAME
```
    Origin of reference frame.
  - REF_FRAME
```
public static final Keyword REF_FRAME
```
    Name of the reference frame in which the state vector and optional Keplerian element data are given.
  - REF_FRAME_EPOCH
```
public static final Keyword REF_FRAME_EPOCH
```
    Epoch of reference frame, if not intrinsic to the definition of the reference frame.
  - MEAN_ELEMENT_THEORY
```
public static final Keyword MEAN_ELEMENT_THEORY
```
    Mean element theory.
  - X
```
public static final Keyword X
```
    Position vector X-component.
  - Y
```
public static final Keyword Y
```
    Position vector Y-component.
  - Z
```
public static final Keyword Z
```
    Position vector Z-component.
  - X_DOT
```
public static final Keyword X_DOT
```
    Velocity vector X-component.
  - Y_DOT
```
public static final Keyword Y_DOT
```
    Velocity vector Y-component.
  - Z_DOT
```
public static final Keyword Z_DOT
```
    Velocity vector Z-component.
  - SEMI_MAJOR_AXIS
```
public static final Keyword SEMI_MAJOR_AXIS
```
    Orbit semi-major axis.
  - MEAN_MOTION
```
public static final Keyword MEAN_MOTION
```
    Mean Motion.
  - ECCENTRICITY
```
public static final Keyword ECCENTRICITY
```
    Orbit eccentricity.
  - INCLINATION
```
public static final Keyword INCLINATION
```
    Orbit inclination.
  - RA_OF_ASC_NODE
```
public static final Keyword RA_OF_ASC_NODE
```
    Orbit right ascension of ascending node.
  - ARG_OF_PERICENTER
```
public static final Keyword ARG_OF_PERICENTER
```
    Orbit argument of pericenter.
  - TRUE_ANOMALY
```
public static final Keyword TRUE_ANOMALY
```
    Orbit true anomaly.
  - MEAN_ANOMALY
```
public static final Keyword MEAN_ANOMALY
```
    Orbit mean anomaly.
  - GM
```
public static final Keyword GM
```
    Gravitational coefficient.
  - MASS
```
public static final Keyword MASS
```
    Spacecraft mass.
  - SOLAR_RAD_AREA
```
public static final Keyword SOLAR_RAD_AREA
```
    Solar radiation pressure area.
  - SOLAR_RAD_COEFF
```
public static final Keyword SOLAR_RAD_COEFF
```
    Solar radiation pressure coefficient.
  - DRAG_AREA
```
public static final Keyword DRAG_AREA
```
    Drag area.
  - DRAG_COEFF
```
public static final Keyword DRAG_COEFF
```
    Drag coefficient.
  - EPHEMERIS_TYPE
```
public static final Keyword EPHEMERIS_TYPE
```
    Ephemeris type.
  - CLASSIFICATION_TYPE
```
public static final Keyword CLASSIFICATION_TYPE
```
    Classification type.
  - NORAD_CAT_ID
```
public static final Keyword NORAD_CAT_ID
```
    NORAD catalogue number.
  - ELEMENT_SET_NO
```
public static final Keyword ELEMENT_SET_NO
```
    Element set number of the satellite.
  - REV_AT_EPOCH
```
public static final Keyword REV_AT_EPOCH
```
    Revolution Number.
  - BSTAR
```
public static final Keyword BSTAR
```
    SGP/SGP4 drag-like coefficient.
  - MEAN_MOTION_DOT
```
public static final Keyword MEAN_MOTION_DOT
```
    First Time Derivative of the Mean Motion.
  - MEAN_MOTION_DDOT
```
public static final Keyword MEAN_MOTION_DDOT
```
    Second Time Derivative of the Mean Motion.
  - COV_REF_FRAME
```
public static final Keyword COV_REF_FRAME
```
    Coordinate system for covariance matrix. Its value can either be RSW, RTN (both indicating /* "Radial, Transverse, Normal") or TNW.
  - CX_X
```
public static final Keyword CX_X
```
    Covariance matrix [1, 1] element.
  - CY_X
```
public static final Keyword CY_X
```
    Covariance matrix [2, 1] element.
  - CY_Y
```
public static final Keyword CY_Y
```
    Covariance matrix [2, 2] element.
  - CZ_X
```
public static final Keyword CZ_X
```
    Covariance matrix [3, 1] element.
  - CZ_Y
```
public static final Keyword CZ_Y
```
    Covariance matrix [3, 2] element.
  - CZ_Z
```
public static final Keyword CZ_Z
```
    Covariance matrix [3, 3] element.
  - CX_DOT_X
```
public static final Keyword CX_DOT_X
```
    Covariance matrix [4, 1] element.
  - CX_DOT_Y
```
public static final Keyword CX_DOT_Y
```
    Covariance matrix [4, 2] element.
  - CX_DOT_Z
```
public static final Keyword CX_DOT_Z
```
    Covariance matrix [4, 3] element.
  - CX_DOT_X_DOT
```
public static final Keyword CX_DOT_X_DOT
```
    Covariance matrix [4, 4] element.
  - CY_DOT_X
```
public static final Keyword CY_DOT_X
```
    Covariance matrix [5, 1] element.
  - CY_DOT_Y
```
public static final Keyword CY_DOT_Y
```
    Covariance matrix [5, 2] element.
  - CY_DOT_Z
```
public static final Keyword CY_DOT_Z
```
    Covariance matrix [5, 3] element.
  - CY_DOT_X_DOT
```
public static final Keyword CY_DOT_X_DOT
```
    Covariance matrix [5, 4] element.
  - CY_DOT_Y_DOT
```
public static final Keyword CY_DOT_Y_DOT
```
    Covariance matrix [5, 5] element.
  - CZ_DOT_X
```
public static final Keyword CZ_DOT_X
```
    Covariance matrix [6, 1] element.
  - CZ_DOT_Y
```
public static final Keyword CZ_DOT_Y
```
    Covariance matrix [6, 2] element.
  - CZ_DOT_Z
```
public static final Keyword CZ_DOT_Z
```
    Covariance matrix [6, 3] element.
  - CZ_DOT_X_DOT
```
public static final Keyword CZ_DOT_X_DOT
```
    Covariance matrix [6, 4] element.
  - CZ_DOT_Y_DOT
```
public static final Keyword CZ_DOT_Y_DOT
```
    Covariance matrix [6, 5] element.
  - CZ_DOT_Z_DOT
```
public static final Keyword CZ_DOT_Z_DOT
```
    Covariance matrix [6, 6] element.
  - MAN_EPOCH_IGNITION
```
public static final Keyword MAN_EPOCH_IGNITION
```
    Epoch of ignition.
  - MAN_DURATION
```
public static final Keyword MAN_DURATION
```
    Maneuver duration (If = 0, impulsive maneuver).
  - MAN_DELTA_MASS
```
public static final Keyword MAN_DELTA_MASS
```
    Mass change during maneuver (value is < 0).
  - MAN_REF_FRAME
```
public static final Keyword MAN_REF_FRAME
```
    Coordinate system for velocity increment vector. Its value can either be RSW, RTN (both indicating "Radial, Transverse, Normal") or TNW.
  - MAN_DV_1
```
public static final Keyword MAN_DV_1
```
    First component of the velocity increment.
  - MAN_DV_2
```
public static final Keyword MAN_DV_2
```
    Second component of the velocity increment.
  - MAN_DV_3
```
public static final Keyword MAN_DV_3
```
    Third component of the velocity increment.
  - COVARIANCE_START
```
public static final Keyword COVARIANCE_START
```
    This keyword must appear before the first line of the covariance matrix data.
  - USEABLE_START_TIME
```
public static final Keyword USEABLE_START_TIME
```
    Start of useable time span covered by ephemerides data, it may be necessary to allow for proper interpolation.
  - USEABLE_STOP_TIME
```
public static final Keyword USEABLE_STOP_TIME
```
    End of useable time span covered by ephemerides data, it may be necessary to allow for proper interpolation.
  - INTERPOLATION
```
public static final Keyword INTERPOLATION
```
    The interpolation method to be used.
  - INTERPOLATION_DEGREE
```
public static final Keyword INTERPOLATION_DEGREE
```
    The interpolation degree.
  - COVARIANCE_STOP
```
public static final Keyword COVARIANCE_STOP
```
    This keyword must appear after the last line of the covariance matrix data.
  - CCSDS_TDM_VERS
```
public static final Keyword CCSDS_TDM_VERS
```
    Header: TDM format version in the form of ‘x.y’, where ‘y’ shall be incremented for corrections and minor changes, and ‘x’ shall be incremented for major changes.
    Obligatory: YES
  - PARTICIPANT_1
```
public static final Keyword PARTICIPANT_1
```
    Meta-data: PARTICIPANT_n, n = {1, 2, 3, 4, 5}.
    Participants in a tracking data sessions (spacecraft(s), ground station(s)...)
    Obligatory: YES (at least 1)
  - PARTICIPANT_2
```
public static final Keyword PARTICIPANT_2
```
    Participant 2.
  - PARTICIPANT_3
```
public static final Keyword PARTICIPANT_3
```
    Participant 3.
  - PARTICIPANT_4
```
public static final Keyword PARTICIPANT_4
```
    Participant 4.
  - PARTICIPANT_5
```
public static final Keyword PARTICIPANT_5
```
    Participant 5.
  - MODE
```
public static final Keyword MODE
```
    Meta-data: Tracking mode associated with data section of the segment.
    - SEQUENTIAL: Applies only for range, Doppler, angles, and LOS ionosphere calibrations. The name implies a sequential signal path between tracking participants;
    - SINGLE_DIFF: Applies for differenced data;
    - In other cases, such as troposphere, weather, clocks, etc., use of the MODE keyword does not apply.
    Obligatory: NO
  - PATH
```
public static final Keyword PATH
```
    Meta-data: The PATH keywords shall reflect the signal path by listing the index of each PARTICIPANT in order, separated by commas, with no inserted white space.
    The first entry in the PATH shall be the transmit participant.
    The non-indexed ‘PATH’ keyword shall be used if the MODE is SEQUENTIAL.
    The indexed ‘PATH_1’ and ‘PATH_2’ keywords shall be used where the MODE is SINGLE_DIFF.
    Examples:
    - 1,2 = one-way;
    - 2,1,2 = two-way;
    - 3,2,1 = three-way;
    - 1,2,3,4 = four-way;
    - 1,2,3,2,1 = turn-around range with 1=primary station, 2=satellite, 3=secondary station.
    Obligatory: NO
  - PATH_1
```
public static final Keyword PATH_1
```
    Path 1.
  - PATH_2
```
public static final Keyword PATH_2
```
    Path 2.
  - TRANSMIT_BAND
```
public static final Keyword TRANSMIT_BAND
```
    Frequency band for transmitted frequencies.
    Obligatory: NO
  - RECEIVE_BAND
```
public static final Keyword RECEIVE_BAND
```
    Meta-data: Frequency band for received frequencies.
    Obligatory: NO
  - TURNAROUND_NUMERATOR
```
public static final Keyword TURNAROUND_NUMERATOR
```
    Meta-data: Turn-around ratio numerator.
    Numerator of the turn-around ratio that is necessary to calculate the coherent downlink from the uplink frequency.
    Obligatory: NO
  - TURNAROUND_DENOMINATOR
```
public static final Keyword TURNAROUND_DENOMINATOR
```
    Meta-data: Turn-around ratio denominator.
    Obligatory: NO
  - TIMETAG_REF
```
public static final Keyword TIMETAG_REF
```
    Meta-data: Timetag reference.
    Provides a reference for time tags in the tracking data.
    It indicates whether the timetag associated with the data is the transmit time or the receive time.
    Obligatory: NO
  - INTEGRATION_INTERVAL
```
public static final Keyword INTEGRATION_INTERVAL
```
    Meta-data: Integration interval.
    Provides the Doppler count time in seconds for Doppler data or for the creation of normal points.
    Obligatory: NO
  - INTEGRATION_REF
```
public static final Keyword INTEGRATION_REF
```
    Meta-data: Integration reference.
    Used in conjunction with timetag reference and integration interval.
    Indicates whether the timetag represents the start, middle or end of the integration interval.
    Obligatory: NO
  - FREQ_OFFSET
```
public static final Keyword FREQ_OFFSET
```
    Meta-data: Frequency offset.
    A frequency in Hz that must be added to every RECEIVE_FREQ to reconstruct it.
    Obligatory: NO
  - RANGE_MODE
```
public static final Keyword RANGE_MODE
```
    Meta-data: Range mode.
    COHERENT, CONSTANT or ONE_WAY.
    Obligatory: NO
  - RANGE_MODULUS
```
public static final Keyword RANGE_MODULUS
```
    Meta-data: Range modulus.
    Modulus of the range observable in the units as specified by the RANGE_UNITS keyword.
    Obligatory: NO
  - RANGE_UNITS
```
public static final Keyword RANGE_UNITS
```
    Meta-data: The RANGE_UNITS keyword specifies the units for the range observable.
    ‘km’ shall be used if the range is measured in kilometers.
    ‘s’ shall be used if the range is measured in seconds.
    'RU' for "range units'
    Obligatory: NO
  - ANGLE_TYPE
```
public static final Keyword ANGLE_TYPE
```
    Meta-data: The ANGLE_TYPE keyword shall indicate the type of antenna geometry represented in the angle data (ANGLE_1 and ANGLE_2 keywords).
    The value shall be one of the following:
    - AZEL for azimuth, elevation (local horizontal);
    - RADEC for right ascension, declination or hour angle, declination (needs to be referenced to an inertial frame);
    - XEYN for x-east, y-north;
    - XSYE for x-south, y-east.
    Obligatory: NO
  - REFERENCE_FRAME
```
public static final Keyword REFERENCE_FRAME
```
    Reference frame in which data are given: used in combination with ANGLE_TYPE=RADEC.
    Obligatory: NO
  - TRANSMIT_DELAY_1
```
public static final Keyword TRANSMIT_DELAY_1
```
    Meta-data: Transmit delays list (up to 5).
    Specifies a fixed interval of time, in seconds, for the signal to travel from the transmitting electronics to the transmit point. Each item in the list corresponds to the each participants.
    Obligatory: NO
  - TRANSMIT_DELAY_2
```
public static final Keyword TRANSMIT_DELAY_2
```
    Second.
  - TRANSMIT_DELAY_3
```
public static final Keyword TRANSMIT_DELAY_3
```
    Second.
  - TRANSMIT_DELAY_4
```
public static final Keyword TRANSMIT_DELAY_4
```
    Second.
  - TRANSMIT_DELAY_5
```
public static final Keyword TRANSMIT_DELAY_5
```
    Second.
  - RECEIVE_DELAY_1
```
public static final Keyword RECEIVE_DELAY_1
```
    Meta-data: Receive delays list.
    Specifies a fixed interval of time, in seconds, for the signal to travel from the tracking point to the receiving electronics. Each item in the list corresponds to the each participants.
    Obligatory: NO
  - RECEIVE_DELAY_2
```
public static final Keyword RECEIVE_DELAY_2
```
    Second.
  - RECEIVE_DELAY_3
```
public static final Keyword RECEIVE_DELAY_3
```
    Second.
  - RECEIVE_DELAY_4
```
public static final Keyword RECEIVE_DELAY_4
```
    Second.
  - RECEIVE_DELAY_5
```
public static final Keyword RECEIVE_DELAY_5
```
    Second.
  - DATA_QUALITY
```
public static final Keyword DATA_QUALITY
```
    Meta-data: Data quality.
    Estimate of the quality of the data: RAW, DEGRADED or VALIDATED.
    Obligatory: NO
  - CORRECTION_ANGLE_1
```
public static final Keyword CORRECTION_ANGLE_1
```
    Meta-data: Correction angle 1.
    Angle correction that has been added or should be added to the ANGLE_1 data.
    Obligatory: NO
  - CORRECTION_ANGLE_2
```
public static final Keyword CORRECTION_ANGLE_2
```
    Meta-data: Correction angle 2.
    Angle correction that has been added or should be added to the ANGLE_2 data.
    Obligatory: NO
  - CORRECTION_DOPPLER
```
public static final Keyword CORRECTION_DOPPLER
```
    Meta-data: Correction Doppler.
    Doppler correction that has been added or should be added to the DOPPLER data.
    Obligatory: NO
  - CORRECTION_RANGE
```
public static final Keyword CORRECTION_RANGE
```
    Meta-data: Correction Range.
    Range correction that has been added or should be added to the RANGE data.
    Obligatory: NO
  - CORRECTION_RECEIVE
```
public static final Keyword CORRECTION_RECEIVE
```
    Meta-data: Correction receive.
    Receive correction that has been added or should be added to the RECEIVE data.
    Obligatory: NO
  - CORRECTION_TRANSMIT
```
public static final Keyword CORRECTION_TRANSMIT
```
    Meta-data: Correction transmit.
    Transmit correction that has been added or should be added to the TRANSMIT data.
    Obligatory: NO
  - CORRECTIONS_APPLIED
```
public static final Keyword CORRECTIONS_APPLIED
```
    Meta-data: Correction applied ? YES/NO
    Indicate whethers or not the values associated with the CORRECTION_* keywords have been applied to the tracking data.
    Obligatory: NO
  - CARRIER_POWER
```
public static final Keyword CARRIER_POWER
```
    Data: Carrier power [dBW].
    Strength of the radio signal transmitted by the spacecraft as received at the ground station or at another spacecraft.
  - DOPPLER_INSTANTANEOUS
```
public static final Keyword DOPPLER_INSTANTANEOUS
```
    Data: Doppler instantaneous [km/s].
    Instantaneous range rate of the spacecraft.
  - DOPPLER_INTEGRATED
```
public static final Keyword DOPPLER_INTEGRATED
```
    Data: Doppler integrated [km/s].
    Mean range rate of the spacecraft over the INTEGRATION_INTERVAL specified in the meta-data section.
  - PC_N0
```
public static final Keyword PC_N0
```
    Data: Carrier power to noise spectral density ratio (Pc/No) [dBHz].
  - PR_N0
```
public static final Keyword PR_N0
```
    Data: Ranging power to noise spectral density ratio (Pr/No) [dBHz].
  - RANGE
```
public static final Keyword RANGE
```
    Data: Range value [km, s or RU].
    
    See Also:
    
    RANGE_UNITS
  - RECEIVE_FREQ_1
```
public static final Keyword RECEIVE_FREQ_1
```
    Data: Received frequencies [Hz].
    The RECEIVE_FREQ keyword shall be used to indicate that the values represent measurements of the received frequency.
    The keyword is indexed to accommodate a scenario in which multiple downlinks are used.
    RECEIVE_FREQ_n (n = 1, 2, 3, 4, 5)
  - RECEIVE_FREQ_2
```
public static final Keyword RECEIVE_FREQ_2
```
    Received frequency 2.
  - RECEIVE_FREQ_3
```
public static final Keyword RECEIVE_FREQ_3
```
    Received frequency 3.
  - RECEIVE_FREQ_4
```
public static final Keyword RECEIVE_FREQ_4
```
    Received frequency 4.
  - RECEIVE_FREQ_5
```
public static final Keyword RECEIVE_FREQ_5
```
    Received frequency 5.
  - RECEIVE_FREQ
```
public static final Keyword RECEIVE_FREQ
```
    Data: Received frequency [Hz].
    Case without an index; where the frequency cannot be associated with a particular participant.
  - TRANSMIT_FREQ_1
```
public static final Keyword TRANSMIT_FREQ_1
```
    Data: Transmitted frequencies [Hz].
    The TRANSMIT_FREQ keyword shall be used to indicate that the values represent measurements of a transmitted frequency, e.g., from an uplink operation.
    The TRANSMIT_FREQ keyword is indexed to accommodate scenarios in which multiple transmitters are used.
    TRANSMIT_FREQ_n (n = 1, 2, 3, 4, 5)
  - TRANSMIT_FREQ_2
```
public static final Keyword TRANSMIT_FREQ_2
```
    Transmitted frequency 2.
  - TRANSMIT_FREQ_3
```
public static final Keyword TRANSMIT_FREQ_3
```
    Transmitted frequency 3.
  - TRANSMIT_FREQ_4
```
public static final Keyword TRANSMIT_FREQ_4
```
    Transmitted frequency 4.
  - TRANSMIT_FREQ_5
```
public static final Keyword TRANSMIT_FREQ_5
```
    Transmitted frequency 5.
  - TRANSMIT_FREQ_RATE_1
```
public static final Keyword TRANSMIT_FREQ_RATE_1
```
    Data: Transmitted frequencies rates [Hz/s].
    The value associated with the TRANSMIT_FREQ_RATE_n keyword is the linear rate of change of the frequency TRANSMIT_FREQ_n starting at the timetag and continuing until the next TRANSMIT_FREQ_RATE_n timetag (or until the end of the data).
    TRANSMIT_FREQ_RATE_n (n = 1, 2, 3, 4, 5)
  - TRANSMIT_FREQ_RATE_2
```
public static final Keyword TRANSMIT_FREQ_RATE_2
```
    Transmitted frequency rate 2.
  - TRANSMIT_FREQ_RATE_3
```
public static final Keyword TRANSMIT_FREQ_RATE_3
```
    Transmitted frequency rate 3.
  - TRANSMIT_FREQ_RATE_4
```
public static final Keyword TRANSMIT_FREQ_RATE_4
```
    Transmitted frequency rate 4.
  - TRANSMIT_FREQ_RATE_5
```
public static final Keyword TRANSMIT_FREQ_RATE_5
```
    Transmitted frequency rate 5.
  - DOR
```
public static final Keyword DOR
```
    Data: DOR [s].
    the DOR keyword represents the range measured via PATH_2 minus the range measured via PATH_1.
  - VLBI_DELAY
```
public static final Keyword VLBI_DELAY
```
    Data: VLBI delay [s].
    The observable associated with the VLBI_DELAY keyword represents the time of signal arrival via PATH_2 minus the time of signal arrival via PATH_1.
  - ANGLE_1
```
public static final Keyword ANGLE_1
```
    Data: ANGLE_1 in degrees and in [-180, +360[ [deg].
    The value assigned to the ANGLE_1 keyword represents the azimuth, right ascension, or ‘X’ angle of the measurement, depending on the value of the ANGLE_TYPE keyword.
    The angle measurement shall be a double precision value as follows: -180.0 ≤ ANGLE_1 < 360.0
    Units shall be degrees.
    See meta-data keyword ANGLE_TYPE for the definition of the angles.
  - ANGLE_2
```
public static final Keyword ANGLE_2
```
    Data: ANGLE_2 in degrees and in [-180, +360[ [deg].
    The value assigned to the ANGLE_2 keyword represents the elevation, declination, or ‘Y’ angle of the measurement, depending on the value of the ANGLE_TYPE keyword.
    The angle measurement shall be a double precision value as follows: -180.0 ≤ ANGLE_2 < 360.0.
    Units shall be degrees.
    See meta-data keyword ANGLE_TYPE for the definition of the angles.
  - CLOCK_BIAS
```
public static final Keyword CLOCK_BIAS
```
    Data: Clock bias [s].
    The CLOCK_BIAS keyword can be used by the message recipient to adjust timetag measurements by a specified amount with respect to a common reference.
  - CLOCK_DRIFT
```
public static final Keyword CLOCK_DRIFT
```
    Data: Clock drift [s/s].
    The CLOCK_DRIFT keyword should be used to adjust timetag measurements by an amount that is a function of time with respect to a common reference, normally UTC (as opposed to the CLOCK_BIAS, which is meant to be a constant adjustment).
  - STEC
```
public static final Keyword STEC
```
    Data: STEC - Slant Total Electron Count [TECU]. The STEC keyword shall be used to convey the line of sight, one way charged particle delay or total electron count (TEC) at the timetag associated with a tracking measurement, which is calculated by integrating the electron density along the propagation path (electrons/m2).
  - TROPO_DRY
```
public static final Keyword TROPO_DRY
```
    Data: TROPO DRY [m].
    Dry zenith delay through the troposphere measured at the timetag.
  - TROPO_WET
```
public static final Keyword TROPO_WET
```
    Data: TROPO WET [m].
    Wet zenith delay through the troposphere measured at the timetag.
  - PRESSURE
```
public static final Keyword PRESSURE
```
    Data: Pressure [hPa].
    Atmospheric pressure observable as measured at the tracking participant.
  - RHUMIDITY
```
public static final Keyword RHUMIDITY
```
    Data: Relative humidity [%].
    Relative humidity observable as measured at the tracking participant.
  - TEMPERATURE
```
public static final Keyword TEMPERATURE
```
    Data: Temperature [K].
    Temperature observable as measured at the tracking participant.
  - DATA_START
```
public static final Keyword DATA_START
```
    Keyword used to delineate the start of a Data block in Keyvalue files.
  - DATA_STOP
```
public static final Keyword DATA_STOP
```
    Keyword used to delineate the end of a Data block in Keyvalue files..
  - tdm
```
public static final Keyword tdm
```
    TDM first keyword.
  - header
```
public static final Keyword header
```
    Header keyword.
  - body
```
public static final Keyword body
```
    Body keyword.
  - segment
```
public static final Keyword segment
```
    Segment keyword.
  - metadata
```
public static final Keyword metadata
```
    Meta-data keyword.
  - data
```
public static final Keyword data
```
    Data keyword.
  - observation
```
public static final Keyword observation
```
    Observation keyword.
- Method Detail
  - values
```
public static Keyword[] values()
```
    Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
    for (Keyword c : Keyword.values()) System.out.println(c);
    Returns:
    
    an array containing the constants of this enum type, in the order they are declared
  - valueOf
```
public static Keyword valueOf(String name)
```
    Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
    
    Parameters:
    
    name - the name of the enum constant to be returned.
    
    Returns:
    
    the enum constant with the specified name
    
    Throws:
    
    IllegalArgumentException - if this enum type has no constant with the specified name
    
    NullPointerException - if the argument is null

Enum Keyword

Enum Constant Summary

Method Summary

Methods inherited from class java.lang.Enum

Methods inherited from class java.lang.Object

Enum Constant Detail

COMMENT

CREATION_DATE

ORIGINATOR

TIME_SYSTEM

EPOCH

START_TIME

STOP_TIME

USER_DEFINED_X

META_START

META_STOP

CCSDS_OPM_VERS

CCSDS_OMM_VERS

CCSDS_OEM_VERS

OBJECT_NAME

OBJECT_ID

CENTER_NAME

REF_FRAME

REF_FRAME_EPOCH

MEAN_ELEMENT_THEORY

X

Y

Z

X_DOT

Y_DOT

Z_DOT

SEMI_MAJOR_AXIS

MEAN_MOTION

ECCENTRICITY

INCLINATION

RA_OF_ASC_NODE

ARG_OF_PERICENTER

TRUE_ANOMALY

MEAN_ANOMALY

GM

MASS

SOLAR_RAD_AREA

SOLAR_RAD_COEFF

DRAG_AREA

DRAG_COEFF

EPHEMERIS_TYPE

CLASSIFICATION_TYPE

NORAD_CAT_ID

ELEMENT_SET_NO

REV_AT_EPOCH

BSTAR

MEAN_MOTION_DOT

MEAN_MOTION_DDOT

COV_REF_FRAME

CX_X

CY_X

CY_Y

CZ_X

CZ_Y

CZ_Z

CX_DOT_X

CX_DOT_Y

CX_DOT_Z

CX_DOT_X_DOT

CY_DOT_X

CY_DOT_Y

CY_DOT_Z

CY_DOT_X_DOT

CY_DOT_Y_DOT

CZ_DOT_X

CZ_DOT_Y

CZ_DOT_Z

CZ_DOT_X_DOT

CZ_DOT_Y_DOT

CZ_DOT_Z_DOT

MAN_EPOCH_IGNITION

MAN_DURATION

MAN_DELTA_MASS

MAN_REF_FRAME

MAN_DV_1