Authorized GPS AES M-Code testing

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Authorized GPS AES M-Code testing

Validate M-Code functions via AES M-Code protocols for high fidelity secure testing

In order to facilitate greater accuracy and robustness than available in civilian GNSS, the US government has long provided secure signals for authorized users. M-Code is the latest iteration of this process, providing an encrypted and standalone service (unlike the P(Y)-Code). Spirent’s SimMCODE enables authorized users to thoroughly test Military GPS User Equipment (MGUE) in repeatable, lab-based environments, using the commercial encryption algorithm, Advanced Encryption Standard (AES).

Spirent was the first provider to be approved by the GPS Directorate to provide AES M-Code testing, and continues to lead the way in the implementation of new signals and technologies, such as the development and security approval of Spirent’s latest M-Code solution, SimMNSA, using the Modernized Navstar Security Architecture. SimMNSA is not limited in terms of location, date, time, and other critical testing variables. Generating real M-Code on the fly, with no need to use prerecorded data sets, SimMNSA greatly accelerates the receiver evaluation process.

  • M-Noise-Spectrally equivalent M-code modulation to test its effects on tracking and acquisition for legacy L1/L2 signals and the new L2C
  • Advanced Encryption Standard (AES) M-code – enables authorized users to test M-code functions using commercial encryption algorithm (SimMCODE)
  • 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 simulator
  • SimMNSA – comprehensive Modern Navstar Security Algorithm testing
  • SDS M-code – M-code testing with Simulator Data Sets (SDS)
GSS9000 Simulation Product


The most powerful PNT/GNSS simulator/test system

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CRPA Adaptive Antennas Drone Anechoic Chamber

Characterizing CRPAs and Other Adaptive Antennas

Use the GSS9790 to test CRPAs and other advanced GNSS antenna designs

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M-code Simulator

Spirent Federal Announces M-Code Updates

Pleasant Grove, UT, September 15, 2020 – Spirent Federal Systems, the nation’s leading provider of GPS and GNSS simulators, announced today the release of SimMNSA 2.0. This release adds advanced scenario controls that enable full recreation of government test vectors while retaining the simple key and fly option of the initial release. Spirent Federal was the […]

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