4-Element Dual Anti-jamming Terminal Anti-jamming Enhanced Anti-Spoofing
Product Introduction
The BGS-4CH-AJAS-01 is a miniaturized, dual-antenna integrated satellite navigation terminal designed for civilian drones and industrial users. It supports dual‑frequency reception of BDS B1i and GPS L1 signals, features anti‑broadband interference capability (up to 3 simultaneous jammers), and provides advanced anti‑spoofing protection. The device integrates a 4‑element antenna array, anti‑jamming processor, and GNSS receiver into a lightweight, compact, and cost‑effective package.
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Key Features
1. RNSS Signal Reception
- Receives BeiDou‑2 and BeiDou‑3 navigation signals
- Civil codes: B1i, L1
2. Anti‑jamming Function
- Suppresses narrowband, broadband, pulse, swept frequency, Gaussian, and other types of jamming on L1/B1
- Maximum simultaneous jammers suppressed: 3
- Unidirectional jamming tolerance: ≥105 dB
- Three‑direction jamming tolerance: ≥95 dB
- Continuous wave survivability: ≥10 W (fire‑resistant design)
3. Anti‑spoofing Function
- Defeats asynchronous, synchronous, and replay spoofing attacks
- Residual spoofing signal CN₀ at output: ≤20 dB
- Delivers clean GNSS signals to the back‑end receiver
4. Software Upgrade
- Field upgradeable via serial port (anti‑jamming module & receiver module)
5. System Self‑test
- Built‑in self‑test and status monitoring
6. Interference Detection
- Real‑time interference detection and jamming power measurement
7. Fire Resistance
- Withstands continuous wave power ≥10 W
8. Security
- Overvoltage protection
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Electrical & Performance Specifications
| Parameter | Value |
|-----------|-------|
| Operating Frequency | L1: 1575.42 MHz / B1: 1561.098 MHz |
| Anti‑jamming (unidirectional) | ≥105 dB |
| Anti‑jamming (3‑direction) | ≥95 dB |
| Anti‑spoofing residual CN₀ | ≤20 dB |
| Positioning accuracy (no jamming) | Horizontal ≤1.5 m |
| Positioning accuracy (with jamming) | Horizontal ≤10 m |
| Velocity accuracy | ≤0.2 m/s (95%) |
| Timing accuracy | ≤100 ns (95%) |
| Operating voltage | 5 – 17 V DC (12 V recommended) |
| Power consumption | ≤13 W |
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Interface Definition
Power / Data Connector (J30J‑9ZK core)
| Pin | Name | Direction | Level | Remarks |
|-----|------|-----------|-------|---------|
| 1,2 | VCC (+) | Input | 5–17 V | 12 V recommended |
| 3,4 | GND (-) | Input | – | Power ground |
| 5 | RXD0 | Input | TTL | Upgrade / receiver serial port |
| 6 | TXD0 | Output | TTL | Position data (NMEA/UBX) |
| 7 | RXD1 | Input | TTL | Anti‑jamming module serial |
| 8 | TXD1 | Output | TTL | Anti‑jamming status |
| 9 | GND | Input | TTL | Signal ground |
RF Interface
- SMA female connector (single coax)
- Output level: L1/B1, -70 ~ -60 dBm
- Provides cleaned RF signal to external GNSS receiver
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Structural Requirements
- Dimensions: 150 mm × 130 mm × 22 mm
- Weight: ≤520 g
- Color: French grey
- Mounting: M3 screws
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Environmental Suitability
- Operating temperature: -40°C ~ +55°C
- Storage temperature: -55°C ~ +70°C
- Relative humidity: 96% RH at 40°C
- Rain test: Meets GJB150A requirements
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Typical Application Scenarios
- Time synchronization security (power, telecom, finance)
- Navigation safety for unmanned aircraft, vehicles, and vessels
- Fleet defense and navigation security
- High‑end logistics navigation safety
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Installation & Use
1. Mounting
Secure with M3 screws through the mounting holes.
2. Power Supply
XT30 connector; input 5–17 V DC (max 17 V, 12 V recommended).
3. Data Connection (two modes)
*Serial mode:* Connect TTL serial port to flight controller GNSS port.
- TXD0 → FC RX
- RXD0 → FC TX
- GND → GND
Outputs NMEA or UBX protocol (built‑in u‑blox M10 receiver).
*RF output mode:* Connect SMA cable from product RF port to the UAV’s antenna input.
⚠️ Ensure the connected device does NOT supply more than 5 V to this RF port to avoid damage.
4. Flight Controller Protocol
Supports NMEA‑0183 and UBX protocols.
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Integration Notes
- The product communicates with the host platform via low‑frequency data cable.
- It replaces a conventional active antenna and positioning terminal in RF signal access mode.
- When using USB‑to‑TTL tool, do not hot‑plug while powered to avoid damaging the serial port.
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Disclaimer
This product is designed to enhance satellite navigation security. Users must comply with all relevant laws and regulations. Any illegal activity carried out using this product is not related to the manufacturer or the product itself.
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