GNSS jamming

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GNSS jamming, including GPS jamming, is an act of communications interference to overwhelm global navigation satellite system (GNSS) receivers with powerful radio signals that drown out the navigation signals from GPS, GLONASS, BeiDou, or Galileo satellite constellations. It renders the receiver unable to calculate its position or time accurately. A common tactic of modern warfare, such jamming can disrupt various GNSS-dependent devices, from vehicle and aircraft navigation systems to precision agriculture and mobile phone networks. In civil aviation, GPS jamming can disrupt ADS-B transmission. Under ITU rules, countries are obliged to eliminate harmful interference from GPS jamming and GPS spoofing, but the ITU lacks effective enforcement measures. The ICAO legal framework requires that countries should implement appropriate prevention and mitigation of GPS jamming and spoofing. Under the ICAO's Montreal Convention, countries shall make GPS jamming and spoofing punishable. In the United States, the operation, marketing, or sale of any GPS jamming equipment is prohibited under federal law.