Gssip Message Format - Safran SecureSync 2400 User Manual

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GSSIP Message Format

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:

GSSIP = GPS STANDARD SERIAL INTERFACE PROTOCOL

Fix taken at 12:35:19 UTC

Status: A=active or V=Void.

Latitude 48 deg 07.038' N

Longitude 11 deg 31.000' E

Speed over the ground in knots

Track angle in degrees True

Date—23rd of March 1994

Magnetic Variation

The checksum data, always begins with

format includes

3 ICD-GPS-153C

messages which are used to support

SecureSync 2400 User Manual