What is satellite jamming?
Satellite jamming is the deliberate use of radio transmitters to overpower or corrupt a satellite's signal with interfering noise, denying the signal to legitimate receivers. It is one of the oldest and most accessible forms of electronic warfare: a sufficiently powerful jammer operating near the target receiver requires no access to the satellite or ground infrastructure. Jamming can target the satellite's uplink (from a ground transmitter toward the satellite) or its downlink (near the user terminal).
Types of jamming
Noise jamming (barrage): Broadcasts wideband noise across the entire frequency band, crude but effective. Spot jamming: Concentrates power on a specific carrier frequency for more efficient disruption with less transmit power. GPS/GNSS jamming: Particularly impactful because GPS receivers operate at very low power levels (−130 dBm) — a cheap handheld jammer can disrupt GPS across a wide area. GPS jamming events are recorded daily in contested regions (Black Sea, Eastern Mediterranean, Baltic).
Real-world incidents
GPS jamming near the Kaliningrad exclave disrupted aircraft navigation across the Baltic region from 2018 onwards. During the 2023–2024 conflicts in the Middle East, GPS jamming affected commercial aviation across a broad region. Following the Viasat attack in 2022, Starlink terminals deployed in Ukraine reported jamming attempts. Starlink's phased-array antennas provide some inherent anti-jamming advantage through beam nulling and frequency hopping.
Anti-jamming countermeasures
Effective anti-jamming techniques include: directional antennas that receive signal only from the satellite's direction, rejecting ground-based jammers; spread-spectrum transmission that distributes the signal across a wide bandwidth, making it harder to jam efficiently; adaptive null steering in phased arrays that place a null in the antenna pattern toward the jammer; and encryption that prevents an adversary from distinguishing legitimate signals from jamming noise.