urn:nasa:pds:mess-rs-raw:data-odf:mess_rs_11341_342_odf 1.0 1.13.0.0 Product_Observational Verma, A. K.; Perry, M. E.; Lemoine, F. G.; Smith, D. E.; Ensor, S.; Reid, M. R. 2020 MESSENGER Radio Science Orbit Data File 2020-10-12 1.0 This data file has been migrated from PDS3 PRODUCT_ID MESS_RS_11341_342_ODF.DAT in data set MESS-V/H-RSS-1-EDR-RAWDATA-V1.0 to PDS4. The data file has not been changed; a new PDS4 label was created as part of the migration process. 2011-12-07T21:00:03.500000Z 2011-12-08T17:30:26.500000Z Science Raw MESSENGER raw radio tracking data Radio Science MErcury Surface, Space ENvironment, GEochemistry, and Ranging Mission Mission urn:nasa:pds:context:investigation:mission.messenger data_to_investigation MESSENGER Spacecraft urn:nasa:pds:context:instrument_host:spacecraft.mess is_instrument_host RSS Instrument urn:nasa:pds:context:instrument:rss.mess is_instrument NASA Deep Space Network Observatory urn:nasa:pds:context:facility:observatory.dsn is_facility DSN Instrumentation Instrument urn:nasa:pds:context:instrument:dsn.rss is_instrument DSN Antenna DSS 15 Telescope urn:nasa:pds:context:telescope:goldstone.dss15_34m is_telescope DSN Antenna DSS 26 Telescope urn:nasa:pds:context:telescope:goldstone.dss26_34m is_telescope DSN Antenna DSS 45 Telescope urn:nasa:pds:context:telescope:canberra.dss45_34m is_telescope DSN Antenna DSS 55 Telescope urn:nasa:pds:context:telescope:madrid.dss55_34m is_telescope Mercury Planet urn:nasa:pds:context:target:planet.mercury data_to_target urn:nasa:pds:radiosci.documentation:dsn.trk-2-18:2008-02-29 data_to_document Reference document for the Orbit Data File (ODF) data. For data collected earlier or later than this document, consult other document products in the same collection. ODFs were produced by the NASA/JPL Multi-Mission Navigation Radio Metric Data Conditioning Team for use in determining spacecraft trajectories, gravity fields affecting them, and radio propagation conditions. Each ODF consists of many 36-byte logical records, which fall into 7 primary groups plus an End-of-File Group. An ODF usually contains most groups, but may not have all. The first record in each of the 7 primary groups is a header record; depending on the group, there may be from zero to many data records following each header. MESS-V/H-RSS-1-EDR-RAWDATA-V1.0:MESS_RS_11341_342_ODF.DAT data_to_raw_source_product PDS Geosciences Node The value for external_source_product_identifier is constructed from the PDS3 DATA_SET_ID, an ASCII colon character, and the PDS3 PRODUCT_ID. mess_rs_11341_342_odf.dat 2020-10-12T12:02:51 403200 ceb41aecad58d98c0ec8a8435fe802f6 ODF File Label Group Header 0 1 The File Label Group is usually the first of several groups of records in an Orbit Data File (ODF). It identifies the spacecraft, the file creation time, the hardware, and the software associated with the ODF. The File Label Group Header is the first record in the File Label Group. It is one 36-byte record and is followed by one 36-byte data record. Occasionally, the File Label Group is omitted from an ODF. The row suffix bytes in the File Label Group Header are set to 0. 4 0 36 Primary Key 1 1 SignedMSB4 4 Item 1: The Primary Key indicates the type of data records to follow. In the File Label Group Header this field is set to 101. Secondary Key 2 5 UnsignedMSB4 4 Item 2: The Secondary Key is not used in the ODF. It is set to 0. Logical Record Length 3 9 UnsignedMSB4 4 Item 3: The Logical Record Length gives the number of 36-byte physical records making up each logical record in a File Label Group data record. For the File Label Group it is set to 1. Group Start Packet Number 4 13 UnsignedMSB4 4 Item 4: The Group Start Packet Number gives the number of the ODF packet containing the File Label Group Header. Set to 0, since the File Label Group Header, when it appears, is always first. ODF File Label Group Data 36 1 The File Label Group is usually the first of several groups of records in an Orbit Data File (ODF). It identifies the spacecraft, the file creation time, the hardware, and the software associated with the ODF. The File Label Group data record is the second record in the File Label Group. It is one 36-byte record and is preceded by one 36-byte File Label Group header record. Occasionally, the File Label Group is omitted from an ODF. 7 0 36 System ID 1 1 ASCII_String 8 Items 1: A character string identifying the hardware on which the ODF was created. Left-justified and padded with blanks. Program ID 2 9 ASCII_String 8 Items 2: A character string identifying the program under which the ODF was created. Left-justified and padded with blanks. Spacecraft ID Number 3 17 UnsignedMSB4 4 Item 3: ID number for the spacecraft. These are specified in DSN document 820-013, OPS-6-21. Representative values include Magellan 18 Voyager 1 31 Voyager 2 32 JUNO 61 Clementine 64 Galileo Orbiter 77 Cassini 82 Mars Global Surveyor 94 Dawn 203 MESSENGER 236. File Creation Date (YYMMDD) 4 21 UnsignedMSB4 4 Item 4: The date on which the ODF was created, given as a single number of the form YYMMDD. where YY is the two least significant digits of the year MM is the month (01 through 12) DD is the day of month (01 through 31). File Creation Time (hhmmss) 5 25 UnsignedMSB4 4 Item 5: The time at which the ODF was created, given as a single number of the form HHMMSS. where HH is the two-digit hour (00 through 23) MM is the two-digit minute (00 through 59) SS is the two-digit second (00 through 59). File Reference Date (YYYYMMDD) 6 29 UnsignedMSB4 4 Item 6: The reference date for ODF time tags -- for example, 19500101 for EME50. Older files which have reference dates of zero will be assumed to be EME50. File Reference Time (HHMMSS) 7 33 UnsignedMSB4 4 Item 7: The reference time for ODF time tags in the format HHMMSS. ODF Identifier Group Header 72 1 The Identifier Group is usually the second of several groups of records in an Orbit Data File (ODF). It is sometimes used to identify contents of data records that follow. The Identifier Group Header is the first record in the Identifier Group. It is one 36-byte record and is followed by one 36-byte Identifier Group data record. Occasionally the Identifier Group is omitted from an ODF. The row suffix bytes in the Identifier Group Header are set to 0." 4 0 36 Primary Key 1 1 SignedMSB4 4 Item 1: The Primary Key indicates the type of data records to follow. In the Identifier Group Header this field is set to 107. Secondary Key 2 5 UnsignedMSB4 4 Item 2: The Secondary Key is not used in the ODF. It is set to 0. Logical Record Length (in packets) 3 9 UnsignedMSB4 4 Item 3: The Logical Record Length gives the number of 36-byte physical records making up each logical record in an Identifier Group data record. For the Identifier Group it is set to 1. Group Start Packet Number 4 13 UnsignedMSB4 4 Item 4: The Group Start Packet Number gives the number of the ODF packet containing the Identifier Group Header. Usually set to 2, since the Identifier Group usually follows the Label Group immediately in the ODF. ODF Identifier Group Data 108 1 The Identifier Group is usually the second of several groups of records in an Orbit Data File (ODF). It is sometimes used to identify contents of data records that follow. The Identifier Group data record is the second record in the Identifier Group. It is one 36-byte record and is preceded by one 36-byte Identifier Group header record. Occasionally the Identifier Group is omitted from an ODF. 3 0 36 Identifier 1 1 1 ASCII_String 8 Items 1: A character string sometimes used to identify contents of data records to follow. Set to the ASCII characters 'TIMETAG' followed by one ASCII 'blank'. Identifier 2 2 9 ASCII_String 8 Items 2: A character string sometimes used to identify contents of data records to follow. Set to the ASCII characters 'OBSRVBL' followed by one ASCII 'blank'. Identifier 3 3 17 ASCII_String 20 Item 3: A character string sometimes used to identify contents of data records to follow. Set to the ASCII characters 'OD-SAMPL-ID FRQ RSD' followed by one ASCII blank. ODF Orbit Data Group Header 144 1 The Orbit Data Group is usually the third of several groups of records in an Orbit Data File (ODF). It contains the majority of the data included in the file. The Orbit Data Group Header is the first record in the Orbit Data Group; it is usually followed by many Orbit Data Group data records, ordered by time. All records in the Orbit Data Group have 36 bytes. The row suffix bytes in the Orbit Data Group Header are set to 0. This Orbit Data Group follows TRK-2-18, Revision E of 29 February 2008. 4 0 36 Primary Key 1 1 SignedMSB4 4 Item 1: The Primary Key indicates the type of data records to follow. In the Orbit Data Group Header this field is set to 109. Secondary Key 2 5 UnsignedMSB4 4 Item 2: The Secondary Key is not used in the ODF. It is set to 0. Logical Record Length (in packets) 3 9 UnsignedMSB4 4 Item 3: The Logical Record Length gives the number of 36-byte physical records making up each logical record in an Orbit Data Group data record. For the Orbit Data Group it is set to 1. Group Start Packet Number 4 13 UnsignedMSB4 4 Item 4: The Group Start Packet Number gives the number of the ODF packet containing the Orbit Data Group Header. Since the Orbit Data Group usually follows immediately after the File Label Group and the Identifier Group, it is usually set to 4. ODF Orbit Data Group Data 180 10697 The Orbit Data Group is usually the third of several groups of records in an Orbit Data File (ODF). It contains the majority of the data included in the file. The Orbit Data Group Header is the first record in the Orbit Data Group; it is usually followed by many Orbit Data Group data records, ordered by time. All records in the Orbit Data Group have 36 bytes. Their format and content follow the specification in TRK-2-18, Revision E of 29 February 2008. 7 0 36 Record Time Tag, integer part 1 1 UnsignedMSB4 4 Item 1: The integer part of the record time tag in seconds, measured from the File Reference Date and Time in the ODF File Label Group Data (usually 0 hours UTC on 1 January 1950). The fractional part of the time tag is in the next Field_Binary. Items 2-3 2 5 UnsignedBitString 4 Items 2-3 of the ODF Orbit Data Group Data. 2 Record Time Tag, fractional part 1 1 10 UnsignedBitString Item 2: The fractional part of the record time tag (see Item 1) in milliseconds. Primary Receiving Station Downlink Delay 2 11 32 UnsignedBitString Item 3: Downlink delay for the primary receiving station in nanoseconds. Observable, integer part 3 9 SignedMSB4 4 Item 4: The integer part of the observable. The fractional part is in Field 4 (Item 5). See Item 10 for the data type stored in these fields. A Doppler observable (in Hertz) is computed according to the following equation. The time tag tr is the mid-point of the compression interval ti to tj. Observable = [B/|B|]*[(Nj-Ni)/(tj-ti) - |Fb*K + B|] where: B = bias placed on receiver Ni = Doppler count at time ti Nj = Doppler count at time tj ti = start time of interval tj = end time of interval K = spacecraft transponder turnaround ratio, which varies with band used (see Item 11); set to 1 for S-band receivers 11/3 for X-band receivers 176/27 for Ku-band receivers 209/15 for Ka-band receivers (Note: future spacecraft transponders may require different values of K) Fb = (X1/X2)*(X3*Fr + X4) -Fsc + R3 for one-way Doppler = (X1/X2)*(X3*Fr + X4) -(T1/T2)*(T3*Ft + T4) for all other Doppler where: Fr = receiver (VCO) frequency at time tr Fsc = spacecraft (beacon) frequency Ft = transmitter frequency at time tr-RTLT R3 = 0 for S-band receivers = 0 for X-band receivers = 0 for Ku-band receivers = 0 for Ka-band receivers T1 = 240 for S-band transmitters (see Item 12) = 240 for X-band transmitters = 142 for Ku-band transmitters = 14 for Ka-band transmitters T2 = 221 for S-band transmitters = 749 for X-band transmitters = 153 for Ku-band transmitters = 15 for Ka-band transmitters T3 = 96 for S-band transmitters = 32 for X-band transmitters = 1000 for Ku-band transmitters = 1000 for Ka-band transmitters T4 = 0 for S-band transmitters = 6.5 10^9 for X-band transmitters = -7.0 10^9 for Ku-band transmitters = 1.0 10^10 for Ka-band transmitters X1 to X4 have the same values as T1 to T4 but are dependent on the exciter band (Item 13) RTLT is the round-trip light time For Doppler data the residual (sometimes called the pseudo-residual) is the observed Doppler minus the predicted Doppler A range observable is computed as follows: Observable = R - C + Z - S where: R = range measurement C = station delay calibration Z = Z correction, which is the delay resulting from DSN station optics that is not included in routine closed loop calibrations (C) S = spacecraft delay Observable, fractional part 4 13 SignedMSB4 4 Item 5: The fractional part of the observable. Multiply the value in this field by 10^-9 and add the result to the result in Field 3. See DESCRIPTION under Field 3 for details. Items 6-14 5 17 UnsignedBitString 4 Items 6-14 of the ODF Orbit Data Group Data. 9 Format ID 1 1 3 UnsignedBitString Item 6: The Format ID. Set to 2. If this value is 1, the ODF was created on or before 1997-04-14 and will not be accurately described by this set of object definitions. In that case, see: JPL/DSN Document 820-13; Rev A DSN System Requirements Detail Interface Design TRK-2-18 DSN Tracking System Interfaces Orbit Data File Interface Mark IVA Effective Date: May 15, 1984 Receiving Station ID 2 4 10 UnsignedBitString Item 7: The ID number of the primary receiving antenna. Numbers can be found in DSN document 810-047, DSN Antenna and Facility Identifiers, DSN Standard Practice. Transmitting Station ID 3 11 17 UnsignedBitString Item 8: The ID number of the transmitting antenna. Set to zero if no transmitter was involved (quasar VLBI, one-way (Doppler, phase, or range), or angles data. Numbers can be found in DSN document 810-047, DSN Antenna and Facility Identifiers, DSN Standard Practice. Network ID 4 18 19 UnsignedBitString Item 9: Network ID Number for the transmitting antenna: Set to: 0 for DSN 1 for other 2 for UPL (Uplink Tracking and Command System) Data Type ID 5 20 25 UnsignedBitString Item 10: Data Type ID Number. Allowed data type values include: 01 = Delta Differential One-way Doppler (D-DOD), Doppler mode, in Hz 02 = Delta Differential One-way Doppler (D-DOD), phase mode, in cycles 03 = Delta Differential One-way Doppler (D-DOD), Doppler mode, in Hz 04 = Delta Differential One-way Doppler (D-DOD), phase mode, in cycles 05 = Delta Differential One-way Ranging (D-DOR), in nanoseconds 06 = Delta Differential One-way Ranging (D-DOR), in nanoseconds 11 = One-way Doppler, in Hertz 12 = Two-way Doppler, in Hertz 13 = Three-way Doppler, in Hertz 37 = Sequential Range, in Range Units (RU) 41 = RE (Tone) Range, in nanoseconds 51 = Azimuth angle, in degrees 52 = Elevation angle, in degrees 53 = Hour angle, in degrees 54 = Declination angle, in degrees 55 = X angle (where +X is east), in degrees 56 = Y angle (where +X is east), in degrees 57 = X angle (where +X is south), in degrees 58 = Y angle (where +X is south), in degrees Downlink Band ID 6 26 27 UnsignedBitString Item 11: Downlink Band ID. Allowed values include: 0 = Not applicable if angle data, Ku-band otherwise 1 = S-band 2 = X-band 3 = Ka-band Uplink Band ID 7 28 29 UnsignedBitString Item 12: Uplink Band ID. Allowed values include: 0 = Not applicable if angle data or 1-way data, Ku-band otherwise 1 = S-band 2 = X-band 3 = Ka-band Reference Frequency Band ID 8 30 31 UnsignedBitString Item 13: Reference frequency band ID. Allowed values include: 0 = Not applicable if angle data, Ku-band otherwise 1 = S-band 2 = X-band 3 = Ka-band Data Validity Indicator 9 32 32 UnsignedBitString Item 14: The data validity flag. Values are: 0 = valid 1 = invalid Items 15-19 6 21 UnsignedBitString 8 Items 15-19 of the ODF Orbit Data Group Data. 5 Item 15 1 1 7 UnsignedBitString Item 15: If data type (Item 10) is: 01-06, the ID number of the second receiving antenna, per 810-047; 11-13, the receiver channel number (0-24); 37, the ranging component with the lowest frequency (1-24); 41, integer seconds of the observable; 51-58, reserved (set to 0). Item 16 2 8 17 UnsignedBitString Item 16: If data type (Item 10) is: 01-06, the Quasar ID (per DSN document 810-005 Module 107 or the Spacecraft ID (per DSN document 820-013, OPS-6-21); 11-58, the Spacecraft ID (per DSN document 820-013, OPS-6-21). Item 17 3 18 18 UnsignedBitString Item 17: If data type (Item 10) is: 01-04, the Phase Point Indicator (set to 0); 05-06, the Modulus Indicator (0 = modded, 1 = unmodded); 11-13, a flag that indicates whether ramps (if available) should be used to replace the receiver reference frequency (0 = both transmitter and receiver are ramped, 1 = transmitter is ramped, receiver is not ramped); 37, reserved (set to 1) 41-58, reserved (set to 0) Item 18 4 19 40 UnsignedBitString Item 18: If data type (Item 10) is: 01-41, the Reference Frequency (High-Part), in 2^24 mHz, where Reference Frequency (High-Part) is trunc(1000*Variable/2^24) and Variable is Reference Frequency in Hz; 51-58, reserved (set to 0). Item 19 5 41 64 UnsignedBitString Item 19: If data type (Item 10) is: 01-41, Reference Frequency (Low-Part), in mHz, where Reference Frequency (Low-Part) is trunc((1000*Variable) modulo 2^24) and Variable is Reference Frequency in Hz; 51-58, reserved (set to 0). Items 20-22 7 29 UnsignedBitString 8 Items 20-22 of the ODF Orbit Data Group Data. 3 Item 20 1 1 20 SignedBitString Item 20: If data type (Item 10) is: 01-04, the value is called Composite 1 and is calculated as (Phase Calibration Flag minus 1) times 100000, plus Channel ID times 10000 where Phase Calibration Flag is 1 = no calibration, 2 = default calibration, 3 = quasar calibration only, 4 = spacecraft calibration only, or 5 = quasar and spacecraft calibration; 05-06, the value is called Composite 1 and is calculated as (Channel Sampling Flag minus 1) times 100000, plus Mode ID times 10000 plus Modulus High-Part in 10^-1 nanoseconds where Channel Sampling Flag is 1 = multiplexed, or 2 = parallel, Mode ID is 0 = one-way, or 1 = two-way Modulus High-Part is trunc(Variable*10), and Variable is Modulus in nanoseconds; 11-13, reserved (set to 0); 37, the uplink ranging coder in-phase time offset from the sample time tag, in seconds; 41-58 reserved (set to 0); Item 21 2 21 42 UnsignedBitString Item 21: If data type (Item 10) is: 01-04, the Compression Time, in 0.01 seconds; 05-06, the Modulus (Low-Part), in 10^-7 seconds, where Modulus (Low-Part) is trunc((10^7*Variable) modulo 10^6) and Variable is Modulus in nanoseconds; 11-13, the Compression Time, in 0.01 seconds; 37, the value is called Composite 2 and is calculated as the highest ranging component times 100000, plus the downlink ranging coder in-phase time offset from the sample time tag, in seconds; 41-58, reserved (set to 0). Item 22 3 43 64 UnsignedBitString Item 22: If data type (Item 10) is: 01-06, the second receiving antenna downlink delay, in nanoseconds; 11-41, the transmitting antenna uplink delay, in nanoseconds, which is always zero for one-way; 51-58, reserved (set to 0). If VLBI data: Second Receiving Station Downlink Delay in nanoseconds. If Doppler, phase, or range data: Transmitting Station Uplink Delay in nanoseconds. Otherwise, set to 0. ODF Ramp Group Header (Station 15) 385272 1 Ramp Groups usually begin as the fourth of several groups of records in an Orbit Data File (ODF). They contain information on tuning of receivers or transmitters. There is usually one Ramp Group for each DSN station. The Ramp Group Header is the first record in each Ramp Group. It is one 36-byte record and is followed by one or more 36- byte Ramp Group data records. Data records are time ordered within each Ramp Group. The Ramp Group may be omitted from an ODF. The row suffix bytes in the Ramp Group Header are set to 0. 4 0 36 Primary Key 1 1 SignedMSB4 4 Item 1: The Primary Key indicates the type of data records to follow. In the Ramp Group Header this field is set to 2030. Secondary Key 2 5 UnsignedMSB4 4 Item 2: Set to the Station (antenna) ID Number. Numbers may be found in DSN document 810-047. If not applicable, the value is set to zero. Logical Record Length (in packets) 3 9 UnsignedMSB4 4 Item 3: The Logical Record Length gives the number of 36-byte physical records making up each logical record in a Ramp Group data record. For the Ramp Group it is set to 1. Group Start Packet Number 4 13 UnsignedMSB4 4 Item 4: The Group Start Packet Number gives the number of the ODF packet containing the Ramp Group Header; packet numbering starts with 0 for the File Label Group Header. ODF Ramp Group Data (Station 15) 385308 30 Ramp Groups usually begin as the fourth of several groups of records in an Orbit Data File (ODF). They contain information on tuning of receivers or transmitters. There is usually one Ramp Group for each DSN station. The Ramp Group Header is the first record in each Ramp Group. It is one 36-byte record and is followed by one or more 36- byte Ramp Group data records. Data records are time ordered within each Ramp Group. The Ramp Group may be omitted from an ODF. 9 0 36 Ramp Start Time, integer part 1 1 UnsignedMSB4 4 second Item 1: The integer part of the ramp start time, measured in seconds from the Reference Time (usually 0 hours UTC on 1 January 1950). Ramp Start Time, fractional part 2 5 UnsignedMSB4 4 nanosecond Item 2: The fractional part of the ramp start time - see field 1 (Item 1). Ramp Rate, integer part 3 9 SignedMSB4 4 Hz/second Item 3: The integer part of the ramp rate. Ramp Rate, fractional part 4 13 SignedMSB4 4 nanohertz/second Item 4: The fractional part of the ramp rate, in units of 10^-9 of field 3i (Item 3). Items 5-6 5 17 UnsignedBitString 4 Items 5-6 of the ODF. 2 Ramp Start Frequency, integer GHz 1 1 22 UnsignedBitString GHz Item 5: Ramp Start Frequency, integer GHz. Transmitting Station ID 2 23 32 UnsignedBitString Item 6:Transmitting Station ID number. Numbers can be found in DSN document 810-047. Ramp Start Frequency, integer part modulo 10^9 6 21 UnsignedMSB4 4 Hertz Item 7: The integer part of the Ramp Start Frequency, modulo 10^9. Ramp Start Frequency, fractional part 7 25 UnsignedMSB4 4 Item 8: The fractional part of the Ramp Start Frequency, in units of 10^-9 of field 6 (Item 7). Ramp End Time, integer part 8 29 UnsignedMSB4 4 second Item 9: The integer part of the ramp end time, measured from the Reference Time (usually 0 hours UTC on 1 January 1950). Ramp End Time, fractional part 9 33 UnsignedMSB4 4 nanosecond Item 10: The fractional part of the ramp end time (see field 8, Item 9). ODF Ramp Group Header (Station 26) 386388 1 Ramp Groups usually begin as the fourth of several groups of records in an Orbit Data File (ODF). They contain information on tuning of receivers or transmitters. There is usually one Ramp Group for each DSN station. The Ramp Group Header is the first record in each Ramp Group. It is one 36-byte record and is followed by one or more 36- byte Ramp Group data records. Data records are time ordered within each Ramp Group. The Ramp Group may be omitted from an ODF. The row suffix bytes in the Ramp Group Header are set to 0. 4 0 36 Primary Key 1 1 SignedMSB4 4 Item 1: The Primary Key indicates the type of data records to follow. In the Ramp Group Header this field is set to 2030. Secondary Key 2 5 UnsignedMSB4 4 Item 2: Set to the Station (antenna) ID Number. Numbers may be found in DSN document 810-047. If not applicable, the value is set to zero. Logical Record Length (in packets) 3 9 UnsignedMSB4 4 Item 3: The Logical Record Length gives the number of 36-byte physical records making up each logical record in a Ramp Group data record. For the Ramp Group it is set to 1. Group Start Packet Number 4 13 UnsignedMSB4 4 Item 4: The Group Start Packet Number gives the number of the ODF packet containing the Ramp Group Header; packet numbering starts with 0 for the File Label Group Header. ODF Ramp Group Data (Station 26) 386424 193 Ramp Groups usually begin as the fourth of several groups of records in an Orbit Data File (ODF). They contain information on tuning of receivers or transmitters. There is usually one Ramp Group for each DSN station. The Ramp Group Header is the first record in each Ramp Group. It is one 36-byte record and is followed by one or more 36- byte Ramp Group data records. Data records are time ordered within each Ramp Group. The Ramp Group may be omitted from an ODF. 9 0 36 Ramp Start Time, integer part 1 1 UnsignedMSB4 4 second Item 1: The integer part of the ramp start time, measured in seconds from the Reference Time (usually 0 hours UTC on 1 January 1950). Ramp Start Time, fractional part 2 5 UnsignedMSB4 4 nanosecond Item 2: The fractional part of the ramp start time - see field 1 (Item 1). Ramp Rate, integer part 3 9 SignedMSB4 4 Hz/second Item 3: The integer part of the ramp rate. Ramp Rate, fractional part 4 13 SignedMSB4 4 nanohertz/second Item 4: The fractional part of the ramp rate, in units of 10^-9 of field 3i (Item 3). Items 5-6 5 17 UnsignedBitString 4 Items 5-6 of the ODF. 2 Ramp Start Frequency, integer GHz 1 1 22 UnsignedBitString GHz Item 5: Ramp Start Frequency, integer GHz. Transmitting Station ID 2 23 32 UnsignedBitString Item 6:Transmitting Station ID number. Numbers can be found in DSN document 810-047. Ramp Start Frequency, integer part modulo 10^9 6 21 UnsignedMSB4 4 Hertz Item 7: The integer part of the Ramp Start Frequency, modulo 10^9. Ramp Start Frequency, fractional part 7 25 UnsignedMSB4 4 Item 8: The fractional part of the Ramp Start Frequency, in units of 10^-9 of field 6 (Item 7). Ramp End Time, integer part 8 29 UnsignedMSB4 4 second Item 9: The integer part of the ramp end time, measured from the Reference Time (usually 0 hours UTC on 1 January 1950). Ramp End Time, fractional part 9 33 UnsignedMSB4 4 nanosecond Item 10: The fractional part of the ramp end time (see field 8, Item 9). ODF Ramp Group Header (Station 45) 393372 1 Ramp Groups usually begin as the fourth of several groups of records in an Orbit Data File (ODF). They contain information on tuning of receivers or transmitters. There is usually one Ramp Group for each DSN station. The Ramp Group Header is the first record in each Ramp Group. It is one 36-byte record and is followed by one or more 36- byte Ramp Group data records. Data records are time ordered within each Ramp Group. The Ramp Group may be omitted from an ODF. The row suffix bytes in the Ramp Group Header are set to 0. 4 0 36 Primary Key 1 1 SignedMSB4 4 Item 1: The Primary Key indicates the type of data records to follow. In the Ramp Group Header this field is set to 2030. Secondary Key 2 5 UnsignedMSB4 4 Item 2: Set to the Station (antenna) ID Number. Numbers may be found in DSN document 810-047. If not applicable, the value is set to zero. Logical Record Length (in packets) 3 9 UnsignedMSB4 4 Item 3: The Logical Record Length gives the number of 36-byte physical records making up each logical record in a Ramp Group data record. For the Ramp Group it is set to 1. Group Start Packet Number 4 13 UnsignedMSB4 4 Item 4: The Group Start Packet Number gives the number of the ODF packet containing the Ramp Group Header; packet numbering starts with 0 for the File Label Group Header. ODF Ramp Group Data (Station 45) 393408 41 Ramp Groups usually begin as the fourth of several groups of records in an Orbit Data File (ODF). They contain information on tuning of receivers or transmitters. There is usually one Ramp Group for each DSN station. The Ramp Group Header is the first record in each Ramp Group. It is one 36-byte record and is followed by one or more 36- byte Ramp Group data records. Data records are time ordered within each Ramp Group. The Ramp Group may be omitted from an ODF. 9 0 36 Ramp Start Time, integer part 1 1 UnsignedMSB4 4 second Item 1: The integer part of the ramp start time, measured in seconds from the Reference Time (usually 0 hours UTC on 1 January 1950). Ramp Start Time, fractional part 2 5 UnsignedMSB4 4 nanosecond Item 2: The fractional part of the ramp start time - see field 1 (Item 1). Ramp Rate, integer part 3 9 SignedMSB4 4 Hz/second Item 3: The integer part of the ramp rate. Ramp Rate, fractional part 4 13 SignedMSB4 4 nanohertz/second Item 4: The fractional part of the ramp rate, in units of 10^-9 of field 3i (Item 3). Items 5-6 5 17 UnsignedBitString 4 Items 5-6 of the ODF. 2 Ramp Start Frequency, integer GHz 1 1 22 UnsignedBitString GHz Item 5: Ramp Start Frequency, integer GHz. Transmitting Station ID 2 23 32 UnsignedBitString Item 6:Transmitting Station ID number. Numbers can be found in DSN document 810-047. Ramp Start Frequency, integer part modulo 10^9 6 21 UnsignedMSB4 4 Hertz Item 7: The integer part of the Ramp Start Frequency, modulo 10^9. Ramp Start Frequency, fractional part 7 25 UnsignedMSB4 4 Item 8: The fractional part of the Ramp Start Frequency, in units of 10^-9 of field 6 (Item 7). Ramp End Time, integer part 8 29 UnsignedMSB4 4 second Item 9: The integer part of the ramp end time, measured from the Reference Time (usually 0 hours UTC on 1 January 1950). Ramp End Time, fractional part 9 33 UnsignedMSB4 4 nanosecond Item 10: The fractional part of the ramp end time (see field 8, Item 9). ODF Ramp Group Header (Station 55) 394884 1 Ramp Groups usually begin as the fourth of several groups of records in an Orbit Data File (ODF). They contain information on tuning of receivers or transmitters. There is usually one Ramp Group for each DSN station. The Ramp Group Header is the first record in each Ramp Group. It is one 36-byte record and is followed by one or more 36- byte Ramp Group data records. Data records are time ordered within each Ramp Group. The Ramp Group may be omitted from an ODF. The row suffix bytes in the Ramp Group Header are set to 0. 4 0 36 Primary Key 1 1 SignedMSB4 4 Item 1: The Primary Key indicates the type of data records to follow. In the Ramp Group Header this field is set to 2030. Secondary Key 2 5 UnsignedMSB4 4 Item 2: Set to the Station (antenna) ID Number. Numbers may be found in DSN document 810-047. If not applicable, the value is set to zero. Logical Record Length (in packets) 3 9 UnsignedMSB4 4 Item 3: The Logical Record Length gives the number of 36-byte physical records making up each logical record in a Ramp Group data record. For the Ramp Group it is set to 1. Group Start Packet Number 4 13 UnsignedMSB4 4 Item 4: The Group Start Packet Number gives the number of the ODF packet containing the Ramp Group Header; packet numbering starts with 0 for the File Label Group Header. ODF Ramp Group Data (Station 55) 394920 32 Ramp Groups usually begin as the fourth of several groups of records in an Orbit Data File (ODF). They contain information on tuning of receivers or transmitters. There is usually one Ramp Group for each DSN station. The Ramp Group Header is the first record in each Ramp Group. It is one 36-byte record and is followed by one or more 36- byte Ramp Group data records. Data records are time ordered within each Ramp Group. The Ramp Group may be omitted from an ODF. 9 0 36 Ramp Start Time, integer part 1 1 UnsignedMSB4 4 second Item 1: The integer part of the ramp start time, measured in seconds from the Reference Time (usually 0 hours UTC on 1 January 1950). Ramp Start Time, fractional part 2 5 UnsignedMSB4 4 nanosecond Item 2: The fractional part of the ramp start time - see field 1 (Item 1). Ramp Rate, integer part 3 9 SignedMSB4 4 Hz/second Item 3: The integer part of the ramp rate. Ramp Rate, fractional part 4 13 SignedMSB4 4 nanohertz/second Item 4: The fractional part of the ramp rate, in units of 10^-9 of field 3i (Item 3). Items 5-6 5 17 UnsignedBitString 4 Items 5-6 of the ODF. 2 Ramp Start Frequency, integer GHz 1 1 22 UnsignedBitString GHz Item 5: Ramp Start Frequency, integer GHz. Transmitting Station ID 2 23 32 UnsignedBitString Item 6:Transmitting Station ID number. Numbers can be found in DSN document 810-047. Ramp Start Frequency, integer part modulo 10^9 6 21 UnsignedMSB4 4 Hertz Item 7: The integer part of the Ramp Start Frequency, modulo 10^9. Ramp Start Frequency, fractional part 7 25 UnsignedMSB4 4 Item 8: The fractional part of the Ramp Start Frequency, in units of 10^-9 of field 6 (Item 7). Ramp End Time, integer part 8 29 UnsignedMSB4 4 second Item 9: The integer part of the ramp end time, measured from the Reference Time (usually 0 hours UTC on 1 January 1950). Ramp End Time, fractional part 9 33 UnsignedMSB4 4 nanosecond Item 10: The fractional part of the ramp end time (see field 8, Item 9). ODF End-of-File Group 396072 1 The End of File Group is usually the last of several groups of records in an Orbit Data File (ODF). It is a single record of 36-bytes and denotes the logical end of the ODF. Row suffix bytes are set to 0. 4 0 36 Primary Key 1 1 SignedMSB4 4 Item 1: The Primary Key indicates the type of data records to follow. In the End of File Group Header this field is set to -1. Secondary Key 2 5 UnsignedMSB4 4 Item 2: The Secondary Key is not used in the ODF. It is set to 0. Logical Record Length (in packets) 3 9 UnsignedMSB4 4 Item 3: The Logical Record Length is set to 0 in the End of File Group, indicating that no logical records follow. Group Start Packet Number 4 13 UnsignedMSB4 4 Item 4: The Group Start Packet Number gives the number of the ODF packet containing the End of File Group; packet numbering starts with 0 for the File Label Group Header.