Active tracking, Acquisition, or Error states. Satellite Information: Number of satellites being tracked. Time of Week (TOW): Precise GPS time. B. Time Transfer Message (Message 5101)
Understanding the ICD-GPS-153 Protocol: Architecture, Messages, and Military PNT Applications
Often encapsulated within the framework, ICD-GPS-153 defines the syntax and timing of three critical ASCII messages:
ICD-GPS-153 compliant interfaces are standard on most ruggedized, military-grade GPS receivers. 1. DAGR and SAASM Receivers icd-gps-153 protocol
Often referred to as the , it ensures interoperability between military receivers (such as the Defense Advanced GPS Receiver - DAGR or PLGR ) and host vehicle systems or mission computers. Key Aspects of ICD-GPS-153
The protocol is a critical military standard interface specification governing data communication between Department of Defense (DoD) Standard GPS Radio Receivers and external equipment. While commercial GPS units rely on NMEA 0183, ICD-GPS-153 is tailored for the stringent security and accuracy needs of military platforms, often used with Selective Availability Anti-Spoofing Module (SAASM) GPS receivers.
The ICD-GPS-153 protocol has a wide range of applications, including: Active tracking, Acquisition, or Error states
The Global Positioning System (GPS) relies on precise communication between satellites, control segments, and user equipment. While many users are familiar with application-level protocols like NMEA 0183, military and specialized aerospace systems require highly secure, robust, and deterministic communication. This is where the protocol becomes essential.
The ICD-GPS-153 protocol message structure consists of:
This article is for informational purposes. Actual implementation of ICD-GPS-153 requires authorization from the U.S. Department of Defense and adherence to ITAR/EAR regulations. DAGR and SAASM Receivers Often referred to as
Transmitted once per second (1 Hz), this provides the operational state of the receiver.
The Current Status message is sent once per second to provide the most recent PNT data, including: (often in radians). Altitude . Time of Week (TOW) . Fix Quality Indicators . 2. Time Transfer (1Hz)
Known as GSSIP (GPS Standard Serial Interface Protocol).
The protocol is structured around specific messages, with common implementations (such as ICD-GPS-153C) using three core messages to provide necessary data: A. Current Status Message (Message 5040)
: The specialized binary dataset matching the Message ID specifications.