KPL/FK Preliminary Frame Kernel for the SRT, DSN ID 69 ===================================================================== Original file name: dss_69_prelim_itrf93_201215.tf Creation date: 2020-12-17 13:08 Created by: Nat Bachman (NAIF/JPL) Introduction ===================================================================== This file provides a topocentric reference frame specification for the Sardinia Radio Telescope (SRT) operated by the Istituto Nazionale di Astrofisica (INAF), and identified by the DSN by the numeric code 69. A body name-ID mapping assignment for this station, which associates the station name and ID code 'DSS-69' 399069 is also provided in this kernel. The reference frame is based on a preliminary estimated geocentric state--- location and velocity---of the station, determined for the epoch 2013 Dec. 1, and extrapolated to the epoch of the reference frame: 2020 Dec. 14. The station position vector points from the earth's barycenter to the station. The station velocity is an estimate of the derivative with respect to time of this vector; in this file, velocity is constant. The station velocity has magnitude on the order of a few cm/year. The topocentric frame orientation specified in this file is expressed as a rotation relative to the terrestrial reference frame ITRF93. Using this kernel ===================================================================== Kernel loading -------------- In order for a SPICE-based program to make use of this kernel, the kernel must be loaded via the SPICE routine FURNSH. If you are running application software created by a third party, see the documentation for that software for instructions on kernel management. See also "Associated frame kernels" and "Associated PCK files" below. Associated PCK files -------------------- For high-accuracy work, this kernel should be used together with a high-precision, binary earth PCK file. NAIF produces these kernels on a regular basis; they can be obtained via anonymous ftp from the NAIF server naif.jpl.nasa.gov The PCK is located in the path pub/naif/generic_kernels/pck The file name is of the form earth_000101_yymmdd_yymmdd.bpc The first two dates are the file's start and stop times; the third is the epoch of the last datum in the EOP file: data from this epoch forward are predicted. The file's coverage starts at a fixed date (currently chosen to be 2000 Jan. 1) and extends to the end of the predict region, which has a duration of roughly 3 months. Associated SPK files -------------------- The SPK file having (original) file name dss69_prelim_itrf93_201215.bsp provides station position and velocity data, specified relative to the ITRF93 terrestrial reference frame. Epoch ----- The epoch of the topocentric reference frame specified by this kernel is 2020 December 14 TDB The position of the station at that epoch was used to define the center and axis directions of the frame. Note that this epoch is not that of the original state data, which is 2013 December 1 TDB. Data sources ===================================================================== Data used in this file were taken from an email message from Dustin Buccino to Connie Dang, sent on December 6, 2020. That message states The coordinates in ITRF2008 are: Reference Frame: ITRF08 Position: X = 4865183.218, Y = 791922.442, Z = 4035136.181 (m) Velocity: VX = -0.0147, VY = 0.0185, VZ = 0.0156 (m/y) Epoch: December 2013 Reference point: Intersection between Elevation and Azimuth axes, at 35 m from the base of the antenna at the ground level. Not Invariant point These inputs were translated to the ITRF93 frame by N. Bachman (JPL/NAIF). Parameters used in the transformation were obtained from [1]. The resulting station state at epoch 2013 Dec 1 were: 4865.1830944493478 791.92252600171813 4035.1362126478120 -2.1047837864086309E-002 2.2274286620987818E-002 1.7622377458614742E-002 Units are km and m/year. [1] IERS Technical Note 36. 4 Terrestrial Reference Systems and Frames. Data ===================================================================== FILE: dss_69_prelim_itrf93_201215.tf This file was created by PINPOINT. PINPOINT Version 3.2.0 --- September 6, 2016 PINPOINT RUN DATE/TIME: 2020-12-17T13:05:47 PINPOINT DEFINITIONS FILE: dss_69_prelim_itrf93_201215.cmt PINPOINT PCK FILE: pck00010.tpc PINPOINT SPK FILE: dss_69_prelim_itrf93_201215.bsp The input definitions file is appended to this file as a comment block. Body-name mapping follows: \begindata NAIF_BODY_NAME += 'DSS-69' NAIF_BODY_CODE += 399069 \begintext Reference frame specifications follow: Topocentric frame DSS-69_TOPO The Z axis of this frame points toward the zenith. The X axis of this frame points North. Topocentric frame DSS-69_TOPO is centered at the site DSS-69, which at the epoch 2020 DEC 14 00:00:00.000 TDB has Cartesian coordinates X (km): 0.4865182946336E+04 Y (km): 0.7919226826996E+03 Z (km): 0.4035136336627E+04 and planetodetic coordinates Longitude (deg): 9.2451508354804 Latitude (deg): 39.4930656804645 Altitude (km): 0.6716762703499E+00 These planetodetic coordinates are expressed relative to a reference spheroid having the dimensions Equatorial radius (km): 6.3781366000000E+03 Polar radius (km): 6.3567519000000E+03 All of the above coordinates are relative to the frame ITRF93. \begindata FRAME_DSS-69_TOPO = 1399069 FRAME_1399069_NAME = 'DSS-69_TOPO' FRAME_1399069_CLASS = 4 FRAME_1399069_CLASS_ID = 1399069 FRAME_1399069_CENTER = 399069 OBJECT_399069_FRAME = 'DSS-69_TOPO' TKFRAME_1399069_RELATIVE = 'ITRF93' TKFRAME_1399069_SPEC = 'ANGLES' TKFRAME_1399069_UNITS = 'DEGREES' TKFRAME_1399069_AXES = ( 3, 2, 3 ) TKFRAME_1399069_ANGLES = ( -9.2451508354804, -50.5069343195355, 180.0000000000000 ) \begintext Definitions file dss_69_prelim_itrf93_201215.cmt -------------------------------------------------------------------------------- Preliminary SPK for the SRT, DSN ID 69 ===================================================================== Original file name: dss_69_prelim_itrf93_201215.bsp Creation date: 2020-12-17 13:05 Created by: Nat Bachman (NAIF/JPL) Introduction ===================================================================== This file provides a preliminary estimated geocentric ephemeris---location and velocity as a function of time, based on a single state vector and epoch---for the Sardinia Radio Telescope (SRT) operated by the Istituto Nazionale di Astrofisica (INAF), and identified by the DSN by the numeric code 69. The station (i.e. antenna) position vector points from the earth's barycenter to the station. The station velocity is an estimate of the derivative with respect to time of this vector; in this file, velocity is constant. The station velocity has magnitude on the order of a few cm/year. The state vector stored in this file is expressed relative to the terrestrial reference frame ITRF93. Using this kernel ===================================================================== Kernel loading -------------- In order for a SPICE-based program to make use of this kernel, the kernel must be loaded via the SPICE routine FURNSH. If you are running application software created by a third party, see the documentation for that software for instructions on kernel management. See also "Associated frame kernels" and "Associated PCK files" below. Associated PCK files -------------------- For high-accuracy work, this kernel should be used together with a high-precision, binary earth PCK file. NAIF produces these kernels on a regular basis; they can be obtained via anonymous ftp from the NAIF server naif.jpl.nasa.gov The PCK is located in the path pub/naif/generic_kernels/pck The file name is of the form earth_000101_yymmdd_yymmdd.bpc The first two dates are the file's start and stop times; the third is the epoch of the last datum in the EOP file: data from this epoch forward are predicted. The file's coverage starts at a fixed date (currently chosen to be 2000 Jan. 1) and extends to the end of the predict region, which has a duration of roughly 3 months. Associated frame kernels ------------------------ The frame kernel having (original) file name dss_69_prelim_itrf93_201215.tf defines a topocentric reference frame associated with the station covered by this file. That kernel supports computations such as finding the azimuth and elevation of a target as seen from a specified station. Data sources ===================================================================== Data used in this file were taken from an email message from Dustin Buccino to Connie Dang, sent on December 6, 2020. That message states The coordinates in ITRF2008 are: Reference Frame: ITRF08 Position: X = 4865183.218, Y = 791922.442, Z = 4035136.181 (m) Velocity: VX = -0.0147, VY = 0.0185, VZ = 0.0156 (m/y) Epoch: December 2013 Reference point: Intersection between Elevation and Azimuth axes, at 35 m from the base of the antenna at the ground level. Not Invariant point These inputs were translated to the ITRF93 frame by N. Bachman (JPL/NAIF). Parameters used in the transformation were obtained from [1]. The resulting station state at epoch 2013 Dec 1 were: 4865.1830944493478 791.92252600171813 4035.1362126478120 -2.1047837864086309E-002 2.2274286620987818E-002 1.7622377458614742E-002 Units are km and m/year. [1] IERS Technical Note 36. 4 Terrestrial Reference Systems and Frames. begindata SITES += 'DSS-69' DSS-69_FRAME = 'ITRF93' DSS-69_CENTER = 399 DSS-69_IDCODE = 399069 DSS-69_EPOCH = @2013-DEC-01/00:00 DSS-69_BOUNDS = ( @1950-JAN-01/00:00, @2050-JAN-01/00:00 ) DSS-69_XYZ = ( 4865.1830944493478 791.92252600171813 4035.1362126478120 ) DSS-69_TOPO_EPOCH = @2020-DEC-14/00:00 DSS-69_UP = 'Z' DSS-69_NORTH = 'X' DSS-69_DXYZ = ( -0.02105 0.02227 0.01762 ) begintext begintext [End of definitions file]