KPL/FK FILE: dss_30_itrf93_210201.tf This file was created by PINPOINT. PINPOINT Version 3.2.0 --- September 6, 2016 PINPOINT RUN DATE/TIME: 2021-02-01T16:08:46 PINPOINT DEFINITIONS FILE: dss_30_itrf93_210201.cmt PINPOINT PCK FILE: earthstns_itrf93_201023.tpc PINPOINT SPK FILE: dss_30_itrf93_210201.bsp The input definitions file is appended to this file as a comment block. Body-name mapping follows: \begindata NAIF_BODY_NAME += 'DSS-30' NAIF_BODY_CODE += 399030 \begintext Reference frame specifications follow: Topocentric frame DSS-30_TOPO The Z axis of this frame points toward the zenith. The X axis of this frame points North. Topocentric frame DSS-30_TOPO is centered at the site DSS-30, which at the epoch 2021 JAN 21 00:00:00.000 TDB has Cartesian coordinates X (km): -0.3854373744123E+04 Y (km): 0.3427836338495E+04 Z (km): 0.3741812872551E+04 and planetodetic coordinates Longitude (deg): 138.3521283430469 Latitude (deg): 36.1409828715320 Altitude (km): 0.1655994180053E+01 These planetodetic coordinates are expressed relative to a reference spheroid having the dimensions Equatorial radius (km): 6.3781370000000E+03 Polar radius (km): 6.3567523142478E+03 All of the above coordinates are relative to the frame ITRF93. \begindata FRAME_DSS-30_TOPO = 1399030 FRAME_1399030_NAME = 'DSS-30_TOPO' FRAME_1399030_CLASS = 4 FRAME_1399030_CLASS_ID = 1399030 FRAME_1399030_CENTER = 399030 OBJECT_399030_FRAME = 'DSS-30_TOPO' TKFRAME_1399030_RELATIVE = 'ITRF93' TKFRAME_1399030_SPEC = 'ANGLES' TKFRAME_1399030_UNITS = 'DEGREES' TKFRAME_1399030_AXES = ( 3, 2, 3 ) TKFRAME_1399030_ANGLES = ( -138.3521283430469, -53.8590171284680, 180.0000000000000 ) \begintext Definitions file dss_30_itrf93_210201.cmt -------------------------------------------------------------------------------- SPK for DSS-30 ===================================================================== Original file name: dss_30_itrf93_210201.bsp Creation date: 2021-02-02 16:10 Created by: Nat Bachman (NAIF/JPL) Introduction ===================================================================== This file provides geocentric states---position and velocity---as a slowly varying function of time for DSS-30, which is the JAXA 54m "Misasa" station located at Usuda, Japan. Note that this station is not located near the city of Misasa, Japan. Station position vectors point from the earth's barycenter to the station; the vectors are expressed in the ITRF93 terrestrial reference frame. Station velocities are estimates of the derivative with respect to time of these vectors; in this file, velocity is constant. The station velocity has magnitude on the order of a few cm/year. States obtained from this file are given 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 -------------------- This kernel should be used together with a 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. NAIF also provides a low-accuracy, long-term predict binary Earth PCK file. See the path cited above for this file and accompanying documentation. Associated frame kernels ------------------------ The frame kernel having (original) file name dss_30_itrf93_210201.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 ===================================================================== The data provided here are taken from [1] Email communication Connie Dang, containing Excel spreadsheet from Bill Folkner, dated 2021-01-14. Coordinates were converted by Bill Folkner to the "JPL ITRF93" frame at epoch 2015 Jan. 1. begindata SITES += 'DSS-30' DSS-30_FRAME = 'ITRF93' DSS-30_CENTER = 399 DSS-30_IDCODE = 399030 DSS-30_EPOCH = @2015-JAN-01/00:00 DSS-30_BOUNDS = ( @1950-JAN-01/00:00, @2050-JAN-01/00:00 ) DSS-30_XYZ = ( -3854.373623 3427.836393 3741.812921 ) begintext By convention the topocentric frame epoch is set to a recent date. Compared to use of the epoch of the location, when the two differ, this provides more accurate topocentric frame orientation for computations performed for epochs near the present date, since the topocentric frame orientation relative to the ITRF93 frame is implemented as a fixed offset (TK) frame. begindata DSS-30_TOPO_EPOCH = @2021-JAN-21/00:00 DSS-30_UP = 'Z' DSS-30_NORTH = 'X' DSS-30_DXYZ = ( -0.02 -0.009 -0.008 ) begintext begintext [End of definitions file]