Selective Availability Anti-spoofing Module (SAASM) test platform

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Selective Availability Anti-spoofing Module (SAASM) test platform

Comprehensive testing of SAASM for classified military applications

Military GPS receivers can use a Selective Availability Anti-Spoofing Module (SAASM) to enable decryption of precise positioning data. Selective Availability (SA) refers to a discontinued practice by the U.S. government to degrade the civil signal to prevent full accuracy. Since May 1, 2000, Selective Availability has not been operational.

However, Anti-spoofing (AS) is still applied to the military signal to guard against fake transmissions of satellite data—by encrypting the P-Code to form the Y-Code. Authorized Precise Positioning Service (PPS) receivers acquire and track the Y-Code by using the SAASM security architecture. Test and evaluation of PPS receiver functions requires SAASM-capable simulation equipment.

Spirent’s SimSAAS enables authorized users of the GSS9000 to test all elements of SAASM receivers, as well as the ability to change the system security clearance requirement via removable hard drive. SimSAAS has been granted Space and Missile Systems Center Security Approval for classified military applications.

  • Intentional Satellite Clock Noise (ISCN) – unclassified SA testing may be performed using open literature models such as a first or second order Gauss Markov model. This does not require authorization from US government.
  • SA/A-S functions – all SAASM functions are fully supported
  • Embedded Auxiliary Output Chip (AOC) design
  • Authorized keys can be loaded through fill port on simulator PC
  • Simulator classification can be upgraded or downgraded with removable hard drives
  • GSS9000 – the most powerful simulation system in the world
  • CRPA Test System – wavefront Controlled Reception Pattern Antenna (CRPA) test system
  • GSS9790 – multi-output, multi-GNSS wavefront simulation
GSS9000 Simulation Product


The most powerful PNT/GNSS simulator/test system

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Pentagon PNT Government Defense

PNT for Government & Defense

M-Code, Y-Code, SAASM testing for MGUE

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GPS Interference Jamming Spoofing Solution page thumbnail

GNSS Interference, Jamming, & Spoofing

Interference & spoofing threat analysis & mitigation

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