TopShield enables reliable GPS/GNSS navigation even in the most challenging military environments: the CRPA TopShield is an anti-jamming device for aircraft, helicopters, missiles, UAV, fighters, navy, vehicles…
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TopShield, the ultimate GPS anti-jam solution

Effective anti-jamming protection in many scenarios:

As GPS systems are becoming more and more vulnerable to jamming threats and that we are increasingly dependent on GPS, having a CRPA is now crucial to ensure safety. TopShield is effective in these scenarios:
  • Multiple low-cost jammers
  • Airborne jammers
  • High power ground jammers

A single solution for multiple platforms

TopShield is a multi-application solution (aircraft, helicopters, missiles, UAV, fighters, navy, and vehicles). It can be operated with all GNSS (Global Navigation Satellite Systems) receivers, including Galileo. It is designed to operate as a standalone unit on board any military platform.

Why TopShield?

  • Multi-platform applications: aircraft, helicopters, missiles, UAV, fighters, navy, vehicles
  • Compact
  • High anti-jamming performance for military GPS signal on L1 and L2 with Space Time Adaptive Processing algorithm (STAP)
  • High dynamics in severe environments
  • Compatible with any GPS receiver and with any standard or miniature 4-element L1/L2 antenna
  • Algorithm immune to rotor blade modulation effect
  • Galileo PRS Compatible
  • Also adapted for critical infrastructures such as airport, port, etc.

CRPA basics: how does TopShield work?

The very low power levels associated with GNSS signals make them vulnerable to jamming, whether intentional or not. This is a particular concern for military users on missions where the availability of GNSS information is critical. Since conventional antennas are non-directional, they are not aimed at any particular point in space. Interference is received in the same way as satellite signals.

The principle behind controlled radiation pattern antennas (CRPAs) involves modifying the non-directional antenna pattern to form a dynamically controlled pattern that optimises the GNSS signal-to-noise ratio. The technique of interference rejection is when the antenna is controlled to minimise the power level of interference sources (“nulls” are introduced into the antenna pattern in the direction of the jammers).

GNSS Products Line

  • TopShield, how does it work?
    Thales TopShield is an ITAR-free anti-jamming device allowing reliable GPS / GNSS positioning for aircraft, helicopters, missiles, submarines… How does it work?
  • TopStar M, military GPS/GNSS receivers for mission success
    TopStar M is a set of military GNSS receivers with high anti-jamming and spoofing performance levels for fighter, helicopter, missile, UAV, surface ship.
  • TopStar C: The certified GNSS localization solution for a safe journey
    Thales TopStar C is a high performing certified GPS/GNSS receiver thanks to functions that allow a precise navigation to aircraft as LPV, RNP, GBAS & ADS-B.
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