From the earliest days of the GPS program, the US government intentionally degraded the civil signal to prevent full accuracy. This practice was referred to as Selective Availability (SA), and could be overcome by acquiring and processing the military signal. SA was officially discontinued on May 1, 2000 by presidential directive and is no longer a requirement for newly launched GPS satellites.

Anti-Spoofing (AS) is 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 GPS SAASM security architecture. Test and evaluation of PPS receiver functions requires SAASM-capable simulation equipment.*

Spirent systems provide products to mitigate the key validation and deployment issues for SA/A-S testing

• SA/A-S functions-all SAASM functions are fully supported*
• Simulator classification can be upgraded or downgraded with removable hard drives
• Spirent Federal’s SimSAAS software has been granted GPS Wing security approval*
• Flexible software allows full control over SA/A-S functions*
  *Authorized users only

Spirent's Value for SAASM Testing

Spirent’s classified module enables lab-based SAASM functionality testing. Please get in touch with us for further information.

eBooks

• The Role of Simulation in the Integration of GNSS Receivers
  Adding location awareness.

White Papers

• Why Simulate?
  What is a GNSS Simulator? Why should you use one for testing?
• What is GNSS Simulation?
  How can simulation help reduce your time to market?

Brochures

• Test Solutions for Interference, Anti-Jam, GPS/inertial, Interference Mitigation
  Spirent has extensive experience of test systems for GPS in the presence of interference and of related mitigation techniques.