COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
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It cannot be duplicated or distributed without expressed written consent.
3.6.7. Storage of Ranging Messages
Ranging messages can be stored in two FIFO-structured files (circular buffers) on the hard disk.
The first file is for storing ranging request messages, primary acknowledgement messages and secondary
acknowledgement messages.
The second file is for storing ranging transaction response messages (phase and/or time measurements).
TCP-IP messages are not divisible: if a message cannot be entirely stored at the end of a file (not enough space
left), it will be stored from the beginning of the file.
The storage function can be enabled/disabled and the file size and access path modified in the Windows registry.
Records format (see Annex 1 for a detailed description of the ranging messages):
Range data: as per STI100013_TTC, Tables 55 (Time & Phase) or 56 (Time only)
Range request: as per STI100013_TTC, Table 52, modified as follows (time-tag adding):
Offset 0-2 TCP-IP message header
Offset 3-4 Time-tag (CORTEX CRT Quantum format)
Offset 5-7 as per offset 3-5 in Table 52
Acknowledgement: as per STI100013_TTC, Tables 53-54, modified as follows (time-tag adding):
Offset 0-2 TCP-IP message header
Offset 3-4 Time-tag (CORTEX CRT Quantum format)
Offset 5-6 as per offset 3-4 in Table 52
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