Document Title:
30
User’s Manual for the GPS Orion-S/-HD Receiver
Document No.
Issue 1.0
GTN-MAN-0110
June 22, 2003
DLR/GSOCNo part of this document shall be reproduced in any form or disclosed to third parties without prior authorization.
4.3.4.3
LO – Load Orbit
Twoline orbital elements for aiding the Orion receiver onboard a LEO satellite are loaded
using the LO command. One command each is required to upload the first and second line of
orbital parameters. Upon successful reception of the first command, an information message
I-LO-Twoline elements line 1 received
is issued. Upon successful reception of the second command, acceptance of the new ele-
ment set is confirmed by the message
I-LO-Twoline elements line 2 received
An inconsistent commanding is reported by an
E-LO-Ignored inconsistent twoline elements
error message.
CmdID Chars. Format
Description
LO
75
Load Orbital Elements
1 x
<STX>
2 xx
Command Id (=LO)
69 69*x
Twoline elements (line 1 or 2)
2 xx
Checksum
1 x
<ETX>
Examples:
<STX>
LO1 12345U 01999 A 01309.99984954 -.00020228 00000-0 -46117-3 0 04
21<ETX>
<STX>
LO2 12345 87.0008 134.9419 0012185 296.6516 63.3393 15.42601037 09
3B<ETX>
4.3.4.4
TO – Transmit Orbit
The TO command initiates the output of an F52 message providing the mean orbital ele-
ments of the user spacecraft used for receiver aiding in low Earth orbits.
CmdID Chars. Format
Description
TO
6
Transmit Orbital Elements
1 x
<STX>
2 xx
Command Id (=TO)
2 xx
Checksum
1 x
<ETX>
Example:
<STX>
TO
1B<ETX>
Dump current orbital elements
