When a regional inspection fleet and a utility timing network expanded into a high-interference urban corridor, GNSS reliability became the top concern. Portable jammers, telecom repeaters, and industrial RF sources caused repeated satellite lock loss. The project team deployed two complementary anti-jamming antennas: the BNT2504 7-element anti-jamming antenna for fixed timing nodes and the BNT009ProB3 high performance anti-jamming antenna for UAVs and ground robots.
The Challenge: Multiple Jammers in a Contested RF Environment
The operating area included a container terminal, a telecom switching yard, and a drone inspection route over a power line corridor. Field surveys recorded narrowband, broadband, pulsed, and swept interference. Single-antenna GNSS receivers frequently lost lock, and timing boards drifted when jamming overlapped with BDS, GPS, GLONASS, or Galileo L1/B1/G1/E1 signals.
Solution: BNT2504 for Timing Nodes, BNT009ProB3 for Mobile Platforms
BNT2504 7-Element Anti-Jamming Antenna at Fixed Sites
Three BNT2504 units were installed at power grid timing cabinets and telecom synchronization racks. The seven-element array forms multiple spatial nulls and suppresses up to six simultaneous jammers. With six active interferers, jammer-to-signal ratio remains above 100 dB; with three interferers, J/S stays above 110 dB. Continuous-wave tolerance is 10 W minimum.
The internal receiver outputs standard NMEA 0183 sentences, so existing timing boards read position, velocity, and time without custom drivers. For RF distribution, the SMA connector provides combined L1/B1/G1/E1 signals at −60 to −40 dBm. The J30J-9ZK connector carries power, TTL serial for firmware upgrades, and the anti-jamming UART. Power is supplied via XT30 at 6–33 V DC, with a maximum draw of 25 W.
BNT009ProB3 High Performance Anti-Jamming Antenna on UAVs and UGVs
The inspection drones and ground robots received the BNT009ProB3. This 4-element circular array uses adaptive spatial nulling to detect the angle of arrival of each jammer and place deep nulls in those directions. It covers BeiDou B1, BeiDou B3, and GPS L1, providing triple-frequency redundancy.
The BNT009ProB3 delivers up to 105 dBc single-jammer suppression and handles three simultaneous interferers. It automatically identifies band-limited Gaussian white noise, spread-spectrum, pulse, sweep, and mixed interference, then adjusts its nulling strategy without user intervention. At 150×130×26.5 mm and 500 g, it fits standard drone payload rails and UGV roofs. The 9–36 V DC input and ≤17 W power draw suit most autonomous platforms.
Field Results
After a two-week deployment, the project team recorded measurable improvements:
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UAV missions completed with no GNSS dropouts along routes that previously failed twice per week.
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BNT2504 timing nodes maintained ≤100 ns timing accuracy even when six test jammers were active.
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Horizontal positioning accuracy stayed ≤1.5 m on drones using the BNT009ProB3 near known interference sources.
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Ground robots kept stable navigation in areas where standard GNSS receivers lost lock within seconds.
The multi-constellation design proved valuable. When a jammer targeted one frequency band, the receivers continued tracking the remaining constellations, avoiding mission aborts.
Integration Notes
The BNT2504 and BNT009ProB3 use different outputs, so installation is straightforward:
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BNT2504: Choose NMEA serial output for timing boards or SMA RF output for existing receivers. Serial and RF paths are mutually exclusive. Do not feed more than 5 V back into external RF ports.
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BNT009ProB3: Connect SMA output to the GNSS receiver’s L1/B3 input. Keep cable loss under 2 dB. Supply 9–36 V DC via the JST connector. No external ground plane is required.
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Avoid hot-plugging USB-TTL adapters during firmware upgrades.
Why This Anti-Jamming Setup Works
The BNT2504 7-element anti-jamming antenna is a six-null blocker designed for multi-constellation reception in a single housing. It covers BDS-B1i/B1c, GPS-L1, GLONASS-G1, and Galileo-E1, making it suitable for critical timing nodes. The BNT009ProB3 high performance anti-jamming antenna adds B1/B3/L1 protection in a compact, lightweight form factor for mobile platforms.
For power grids, telecom networks, UAV fleets, and industrial automation, this combination provides clean PNT under stress. If your operations face intentional or accidental GNSS interference, a layered anti-jamming antenna deployment can reduce dropouts and keep navigation and timing stable.