123519 Fix taken at 12:35:19 UTC
A Status: A=active or V=Void.
4807.038,N Latitude 48 deg 07.038' N
01131.000,E Longitude 11 deg 31.000' E
22.4 Speed over the ground in knots
84.4 Track angle in degrees True
230394 Date—23rd of March 1994
003.1,W Magnetic Variation
*6A The checksum data, always begins with
*
5.4.15 GSSIP Message Format
The GSSIP
1
format includes 3ICD-GPS-153C messages which are used to support
emulation of a SAASM GPS used in a SINCGARS interface. The messages are the
Buffer Box (253), Time Transfer (5101), and the Current Status (5040).
The ICD-GPS-153C protocol defines the format of these messages. The Current
Status and Time Transfer are sent once per second (1Hz). The Buffer Box is sent
once every 6 seconds (1/6 Hz).
The purpose of these three messages is to emulate a SINCGARS interface con-
nection to a SAASM GPS. SecureSync generates these messages emulating the
Time and 1PPS transfer behavior of the SINCGARS interface. An external device
compatible with the SINCGARS interface can attach to an ASCII Output from
SecureSync and receive time and 1PPS as if communicating with and ICD-GPS-
153C compatible SAASM GPS.
These commands are emulated only and contain only time information; position
and velocity information is zeroed out. No controlled data is included in the mes-
sages, hence no SAASM GPS receiver is required.
The ASCII Output supports two configurations for supporting SINCGARS:
1
GSSIP = GPS STANDARD SERIAL INTERFACE PROTOCOL
584 SecureSync 2400 User Manual
APPENDIX
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