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Within the Department of Defense (DoD) ecosystem, an acts as the definitive design blueprint for resolving compatibility between disparate physical systems. The ICD-GPS-153 protocol defines the software and register-level messaging rules for command, control, and data readout between a User Equipment (UE) GPS receiver —such as the legacy Defense Advanced GPS Receiver (DAGR) or a modern Ground-Based GPS Receiver Application Module (GB-GRAM) —and its host vehicle, aircraft, tactical radio, or time server.
: Provides slower background system updates. It transfers long-term telemetry data and configuration states without overcrowding the serial data bus. Tactical Implementation and System Integration
Providing precise time (1PPS) to other equipment.
: In many defense environments, timing servers use this protocol to emulate legacy tactical radio connections (such as the SINCGARS radio interface) to distribute timing packets securely across a network. Protocol Structure and Architecture icd-gps-153 protocol
The , also known as the GPS Standard Serial Interface Protocol (GSSIP) , is a critical technical specification governing how GPS receivers—specifically those with secure military capabilities—communicate with other defense systems. As an Interface Control Document (ICD), it defines the precise data structures, message formats, and timing required for interoperability between GPS hardware and tactical equipment.
: The GLI-FLO device acts as a secure PNT distribution hub, compliant with ICD-GPS-153. It can receive a secure GPS signal from a single DAGR receiver and simultaneously distribute that precise PNT data to multiple weapon systems, communication suites, or other platforms using the ICD-GPS-153 format. This ensures all connected systems have timing synchronized to a common, trusted source.
While the exact mathematical details are classified, the unclassified architecture of ICD-GPS-153 is well-understood. Within the Department of Defense (DoD) ecosystem, an
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A receiver built to ICD-GPS-153 does not simply "listen." It engages in a classified handshake.
, the official interface control document for communicating with standard Department of Defense (DoD) GPS receivers. 1. Overview of ICD-GPS-153 ICD-GPS-153 Protocol Structure and Architecture The , also known
The ICD-GPS-153 protocol stands as a cornerstone of military GPS integration. It provides a standardized, secure interface that connects SAASM GPS receivers to SINCGARS radios, DAGR handheld units, and a wide array of weapon and communication systems.
Tactical GPS systems and ground-based receiver modules (GB-GRAM) often feature multiple serial ports, where some are dedicated to ICD-GPS-153 for control/status and others to NMEA for standard position data. Accessing the Specification
This disciplined transmission schedule ensures that any system interfacing with an ICD-GPS-153 compliant device receives a steady, predictable data stream for real-time PNT processing.
