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 emu-
lation 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 connection to a
SAASM GPS. SecureSync generates these messages emulating the Time and 1PPS trans-
fer 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 velo-
city information is zeroed out. No controlled data is included in the messages, hence no
SAASM GPS receiver is required.
The ASCII Output supports two configurations for supporting SINCGARS:
A configuration of Time Transfer as Message Format1 and Current Status as Format2
causes the SINCGARS protocol to be emulated and the machine state to be initializated.
1
GSSIP = GPS STANDARD SERIAL INTERFACE PROTOCOL
SecureSync 2400 User Manual 543
APPENDIX
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