Jam Guard
Background Information
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GPS operates on multiple frequencies L1 (1575.42 +/-7.5 MHz), L2 (1227.60 +/- 5.5 MHz), and L5 ( 1176.45 +/- 6.25MHz)
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GPS signals reach Earth at very low power levels (typically -130 dBm)
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Broadband Noise Jammers (most common) work by overwhelming a frequency range, overwhelming the signal
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While Jamming is the most common method of GPS interference, spoofing and meaconing are more sophisticated forms of signal disruption
Conceptual Solutions
Spatial Filtering
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Spatial filtering uses multiple elements(antennas) and emphasizes phase control to separate signals based on the direction they come from
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Beamforming directs antenna gain toward GPS signals
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Null-Steering suppresses interference by creating nulls toward the direction of a jammer
Temporal Filtering
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Temporal filtering process a signal based off time or frequency of the signal
Pre/Post Correlation
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Pre-correlation filtering removes broadband noise and interference from a signal
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Post-correlation filtering enhances signal quality by removing jamming effects and any residual noise
Existing Solutions
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Tualaj 4200 Mini GPS/GNSS Anti-Jam CRPA System
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Military grade system that requires a quite for purchase
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Anti-jamming device infiniDome GPSdome-SunStone – dual-band GNSS signal protection, compact design
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High end anti jamming system priced at $2700
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Orolia GPSdome 1.02B Anti-Jammer
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Quote required- only non-ITAR
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Tualaj 4200 Mini
