JAJ2-4P 4 Channel Anti-Interference Anti-Jam Antenna GPS Protection Module
The JAJ2-4P is a four-channel anti-jam antenna module that protects a drone's GNSS receiver from interference and spoofing without adding significant weight or requiring changes to the flight controller. It is the compact member of the JAJ2 series, sized for platforms where payload budget is tight but navigation continuity still has to be guaranteed.
Four-Element Controlled Reception Pattern Array
Rather than filtering interference after the receiver has already lost lock, the JAJ2-4P works at the antenna. Four elements form an adaptive array that measures where each incoming signal comes from and steers nulls toward interference while keeping gain on the satellites overhead. A four-element array places up to three independent nulls, which covers the common case of one or two ground-based emitters in the operating area.
Anti-Jam and Anti-Spoof in One Module
Broadband jamming raises the noise floor until the receiver can no longer track satellites. Spoofing is subtler: a coherent counterfeit signal is accepted as genuine and the drone flies to a false position. Both attacks share one weakness, which is that they arrive from a transmitter near the ground rather than from the constellation above. Because the JAJ2-4P discriminates on arrival direction, the same mechanism defeats both.
Where It Fits in the Series
The JAJ2-4P and the 16-channel JAJ2-16 share the same operating principle and differ in how many simultaneous emitters they can handle. Four channels are sufficient for commercial survey and inspection work, incidental interference, and single-jammer scenarios. Sixteen channels are required where an area is defended by multiple emitters covering different sectors, as at airports and military installations.
Key Features
- 4-channel controlled reception pattern antenna array
- Combined anti-jam and anti-spoof protection
- Places up to 3 independent nulls on interference sources
- Direction-of-arrival discrimination, effective where filtering is not
- Compact and lightweight for payload-constrained platforms
- Metal and engineering plastic construction
- Installs in place of the standard passive GNSS antenna
- No flight controller firmware modification required
- Preserves multi-constellation position fix under attack
- Reversible installation, transferable between airframes
- Same operating principle as the 16-channel JAJ2-16
- Suitable for drone defense and security protection roles
Specifications
| Parameter | Value |
|---|---|
| Model | JAJ2-4P |
| Channels | 4 |
| Independent Nulls | up to 3 |
| Function | Anti-Jam and Anti-Spoof |
| Antenna Principle | controlled reception pattern array (CRPA) |
| Material | metal and engineering plastic |
| Installation | replaces standard GNSS antenna, reversible |
| Firmware Change | not required |
| Series | JAJ2 (4-channel and 16-channel variants) |
| Product Type | navigation anti-interference module |
Applications
- Commercial survey and mapping UAV navigation protection
- Powerline, pipeline and rail infrastructure inspection
- Public safety, police and search and rescue flights
- Precision agriculture over large managed areas
- Delivery and logistics drone route reliability
- Operations near incidental or single-source GNSS interference
- Vehicle-mounted GNSS position protection
- GNSS receiver resilience testing
- Security protection and drone defense integration
Installation Notes
Mount the array with an unobstructed upward field of view and keep payloads, landing gear and other antennas out of its line of sight to the sky, since shadowing costs satellite gain in exactly the directions the module needs to protect. Route the feed away from onboard transmitters to avoid self-interference. If the operating area is known to contain more than two emitters, specify the 16-channel JAJ2-16 instead.
Contact us for pricing and delivery:
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