GNSS interference used to be a theoretical concern. Today, a cheap dashboard jammer can knock out satellite reception across a city block, and a deliberate attacker can deny position, navigation, and timing to drones, ground vehicles, and critical infrastructure. Two anti-jamming antennas — the BNT2504 7-element anti-jamming antenna and the BNTSN8EA satellite navigation 8-element anti-jamming antenna — are designed for exactly this kind of contested RF environment.
Substation Timing Holds During a Local GPS Jammer
A regional power utility noticed phase measurement errors at a substation outside a logistics hub. The cause was a portable GPS jammer plugged into a truck’s cigarette lighter. The substation’s legacy GNSS timing receiver lost lock, and grid synchronization began to drift.
The utility replaced the legacy antenna with the BNT2504 7-element anti-jamming antenna at the timing node. Even with a single-tone jammer active nearby, the seven-element array formed spatial nulls toward the interference source. Because the BNT2504 covers BDS-B1i/B1c, GPS-L1, GLONASS-G1, and Galileo-E1, the receiver also gained multi-constellation signal diversity.
The internal receiver kept outputting standard NMEA 0183 sentences over the anti-jamming UART, so the existing timing board needed no custom driver. Timing accuracy stayed within ≤100 ns at 95%, even with the jammer running. Installation used the J30J-9ZK connector and the module’s 6–33 V DC power input. The 10 W continuous-wave tolerance and overvoltage protection gave the utility margin against stronger local interference.
Pipeline Inspection UAV Flies Through a Seven-Jammer Corridor
An energy services company operated a fixed-wing UAV for pipeline inspection along a route that crossed several industrial areas. During one flight, onboard spectrum monitoring detected seven separate jamming signals — a mix of broadband noise and pulsed interference from illegal GPS repeaters.
The UAV’s standard GNSS module lost position fix twice before the team switched to the BNTSN8EA 8-element anti-jamming antenna. The eight-element array created up to seven independent spatial nulls. Each jammer direction received its own null, while satellite signals from other directions passed through to the Ublox X20P receiver.
With seven jammers active, the unit maintained NMEA 0183 output over RS422 at 115200 baud, and the 1PPS line remained stable. At 670 grams and a 20 mm profile, the BNTSN8EA did not disrupt the airframe balance. The drone completed the pipeline survey without manual takeover. For the company, that meant no lost flight day and no re-fly cost.
Choosing Between the 7-Element and 8-Element Anti-Jamming Antenna
For timing nodes, ground robots, and small UAVs that need up to six interference suppression paths plus serial or RF output, the BNT2504 is a compact fit. Its SMA connector can output combined L1/B1/G1/E1 signals at −60 to −40 dBm if an external receiver chain is preferred.
For missions where seven simultaneous jammers are possible — and weight or drag are critical — the BNTSN8EA is the stronger choice. Both units cover the same single-band civil frequencies and reject narrowband, broadband, pulsed, swept, and Gaussian interference.
In contested RF environments, losing GNSS is not an acceptable failure mode. Spatial filtering through multi-element arrays keeps satellite signals usable when a single-antenna receiver would already be blind.