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Document Title: 10
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.
• If the above steps have taken more than two minutes, the receiver may have started
to scan through the permitted range of frequency bins. Reset or reboot the receiver to
start the signal search in the central frequency bin.
• Select the desired aiding mode (using the AM command).
• Set other operations parameters (e.g. output rates, elevation mask, etc.) as desired.
The receiver should now be indicating proper tracking and a valid 3D navigation fix as part of
the periodic navigation and status messages.
3.1.5 Output Selection
The output of the GPS Orion-S/HD receiver can, to a limited degree, be configured according
to the user needs. All relevant commands and the available output messages are described
in full detail in Chap. 4 of this User’s Guide.
In start-up configuration
1
the receiver outputs an F00 (geodetic) and F40 (Cartesian) naviga-
tion message with time, position and velocity as well as the number of tracked satellites once
per second. Channel status information is available as part of the F03 or F43 message that is
likewise issued at the 1 Hz update rate. Navigation and status data belong to a class of peri-
odic receiver messages that can be controlled using the DR (Data Rate) command. It sets
the output interval of a specified message number in multiples of the navigation interval. Fur-
thermore messages can be polled once or disabled completely. The data rate selection is
available for the F00/03/04/05/08 WinMon messages (i.e. the standard Mitel message set of
the original Orion receiver firmware), the F40/41/42/43/45/46/47/48 WinMon messages (spe-
cific for the Orion-S and/or –HD receiver) as well as a limited set of standard and proprietary
NMEA type navigation and status messages.
Dedicated commands are available for polling specific configuration and operations parame-
ter on demand. These comprise the SA command (Send Almanac, ephemerides and
iono/UTC data), the TA command (Transmit Almanac), the TE command (Transmit Ephem-
eris), the TO command (transmit orbit) and the TT (Transmit Trajectory) command.
Aside from the periodic and polled outputs, the receiver autonomously issues various mes-
sages on the occasion of special events:
• At start-up, a boot message (F99 format) is transmitted that identifies the current
software version.
• Upon reception and processing of most commands a response message (F98 format)
is issued.
• Broadcast ephemeris parameters (F14 message) are transmitted in the Orion-S at
start-up and whenever new values become available as part of the GPS navigation
message.
These messages are cannot be deactivated and may result in temporary output buffer over-
flows, when the communication channel does not provide a sufficient bandwidth for all peri-
odic and non-periodic data.
1
On customer request, other default configurations may be implemented in the firmware of project specific soft-
ware releases.