Fundamental Technologies

Galileo Spacecraft Pages

2. LGA Processor Inputs

2.1  LGA EPD Packets

The LGA packets are described in detail in Steve Jaskulek's document EPD SBAND Mission Software Requirements, Rev. H, dated February 22, 1996. Additional details regarding the LGA packet format are found in the JPL document GLL-3-280 Rev. D, Appendix D, section 3.10.5.4.

**Known deficiency of this document: "Need to include a summary of the format of the LGA packets, including temporal and spatial resolution descriptions; description of channel maps; bit offsets of LGA packet data and data format." See other documents on this website.

2.2 SFDU for Galileo Project

The data packets are enclosed in a Standard Formated Data Unit. The main reference for this section is a compilation of three documents created by Betsy Wilson.

2.3 MAG Data

Magnetometer data is to be included in the LGA archive (section 3.1.7). Magnetic field information is supplied by the magnetometer team in the form of an ASCII file containing time and magnetic field components in spacecraft coordinates.

2.4 SPICE

Position and orientation information of the Galileo spacecraft is included in the EPD header block (section 3.1) of the LGA archive file. The data will be obtained from AACS packets and SPICE kernels. Appendix B contains information on how the coordinate systems are defined.

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Updated 12/21/04, T. Hunt-Ward
tizby@ftecs.com