4-Channel GNSS Anti-Jamming Integrated Receiver for UAV/Drones (4.0-TX-4CH-DF-WG-DT)

1. Product Presentation

This product, model 4.0-TX-4CH-DF-WG-DT, is a miniaturized satellite navigation anti-jamming integrated machine designed for civil unmanned aerial vehicles and industry user needs. It supports the reception of Beidou-3 RNSS B1/B3 dual-frequency signals and has the capability to resist broadband jamming on both B1/B3 frequencies, with a maximum resistance to 3 interference sources. It integrates an internal antenna array, anti-jamming components, and a satellite navigation receiver, serving fields such as reliable navigation for drones and unmanned vehicles, protecting user terminals from various unintentional interference and malicious attacks, and greatly enhancing the security of PNT information.

2. Product Features

1. RNSS signal reception
   • It has the function of receiving RNSS signals from Beidou 2 and Beidou 3 navigation satellites.
   • Civil code: B1C, B1I, B3I
2. Anti-interference capability
   With the anti-interference function of B3 and B1 frequency points, it can suppress narrowband interference, broadband interference, pulse interference, sweep interference, Gaussian interference, and other suppression interference.
3. Software upgrade
   With the software upgrade function, you can upgrade the anti-interference module and the receiver module through the serial port.
4. System self-inspection
   It has self-check and status inspection functions.
5. Interference detection
   With the interference detection function, it can identify the interference power.
6. Anti-burnout function
   Continuous wave power resistance not less than 10W.
7. Security
   With overvoltage protection, reverse connection protection, reverse conduction protection, etc.

3. Electrical Performance

1. Operating frequency
   • B3: 1268.52MHz ± 10.23MHz
   • B1: 1575.42MHz ± 16.368MHz
2. Anti-interference performance
   Single interference dry letter ratio: 95dB, three interference dry letter ratio: 85dB
3. Positioning accuracy
   Level of 10 m (95%), elevation of 10 m (95%)
4. Rate accuracy
   0.2 m/second (95%)
5. Timing accuracy
   ≤100ns (95%)
6. Operating voltage
   The input voltage is 5 to 17 V
7. Power consumption
   ≤17W

Note: For B3 or B1 single-frequency point anti-interference, the power consumption is 10W.

4. Interface Definition

4.1. Power/Data Interface

The J30J-9 ZK core connector is selected, and the pin is defined as follows:

4.2. RF Interface

• Anti-interference signal output interface (reserved), using SMA connector.
• The signal level of the output B3 / B1 is -70 ~ -60 dBm.

5. Physical & Environmental Specifications

5.1. Structural Requirements

• Dimension: 150mm × 130mm × 26.5mm
• Weight: ≤500g (TBD)
• Color: French grey

5.2. Environmental Adaptability

• Operating temperature: -40°C to +55°C
• Storage temperature: -55°C to +70°C
• Relative humidity: At 40°C temperature; 96% humidity
• Rain resistance: Meets the requirements of GJB150A rain test

6. Connection Description

The electrical signal connection of the product and the platform carrier is connected by low-frequency data mode. This product replaces the conventional positioning terminal.

In the RF signal access mode, this product replaces the conventional active antenna.

Figure 6-1. Connection Diagram

Note: When using a USB to TTL tool to connect to the computer, do not plug USB to avoid damage to the serial port.

7. Protocol Configuration & Instruction Set

7.1. Directive Preparation

1. Use the TTL to USB transfer cable to connect the TTL output port of the anti-interference terminal with the personal computer. Connect the white TX wire to the RX of the adapter, the red RX wire to the TX of the adapter, and the black GND wire to the GND of the adapter.

   

2. Run sscom.exe, select the communication port corresponding to the above transfer cable, configured with a port rate of 115200.

   

3. Confirm the hardware connectivity. Use ASCII characters to send "unlogall" and check the return line to send. The return data can be seen, indicating that the hardware is connected and the terminal responds to the instructions sent normally.
   Note: After entering unlogall, please press return/enter.

   

7.2. Instruction Set

Send the following instructions successively. After each instruction is sent, it will return "response: OK," indicating that the instruction responds normally.

The "0.2" in the instruction indicates the 0.2s interval. It can be configured as required. Maximum support is 10Hz (an interval of 0.1s). The above instructions only need to be configured once. These instructions are for when the anti-jamming terminal is connected with the open-source Pixhawk flight control. When docking with other types of flight control, the configuration needs to be adjusted according to the data requirements of the specific flight control.

7.3. Configuration for Specific Flight Controllers

PIXHAWK Open Source Flight Control: Use the instruction set listed in section 7.2.

Beijing Chuangheng Flying Control: Use the following instructions.

8. Data Protocol Examples (NEMA 0183)

8.1. Navigation System Identification

8.2. GPGGA Example

GPGGA, 092204.999, 4250.5589, S, 14718.5084, E, 1, 04, 24.4, 19.7, M, 0000 * 1F

• Field 0: GPGGA - Statement ID (Global Positioning System Fix Data).
• Field 1: UTC time (hhmmss.sss).
• Field 2: Latitude (ddmm.mmmm).
• Field 3: Latitude direction (N/S).
• Field 4: Longitude (ddmm.mmmm).
• Field 5: Longitude direction (E/W).
• Field 6: GPS status (0=unpositioned, 1=non-differential, 2=differential).
• Field 7: Number of satellites in use (00-12).
• Field 8: HDOP (Horizontal Dilution of Precision).
• Field 9: Altitude.
• Field 10: Height of geoid above WGS84 ellipsoid.
• Field 11: Time in seconds since last DGPS update.
• Field 12: DGPS station ID number.
• Field 13: Check value.

8.3. GPGSV Example

GPGSV,3,1,10,20,78,331,45,01,59,235,47,22,41,069,13,32,252,45 * 70

• Field 0: GPGSV - Statement ID (GPS Satellites in View).
• Field 1: Total number of GSV statements.
• Field 2: This GSV statement number.
• Field 3: Total number of satellites in view.
• Field 4: Satellite PRN number.
• Field 5: Elevation in degrees.
• Field 6: Azimuth in degrees.
• Field 7: Signal to Noise Ratio (SNR) in dBHz.
• Fields 8-15: Repeat fields 4-7 for other satellites.
• Field 16: Check value.

8.4. GPRMC Example

GPRMC, 024813.640, A, 3158.4608, N, 11848.3737, E, 10.05, 324.27, 150706, A * 50

• Field 0: GPRMC - Statement ID (Recommended Minimum Specific GPS/TRANSIT Data).
• Field 1: UTC time (hhmmss.sss).
• Field 2: Status (A=active/positioned, V=void/unpositioned).
• Field 3-6: Latitude, N/S, Longitude, E/W.
• Field 7: Speed over ground in knots.
• Field 8: Course over ground in degrees.
• Field 9: UTC date (DDMMYY).
• Field 10-11: Magnetic variation.
• Field 12: Check value.

8.5. GNJAM Example

GNJAM, 23.1,23.1,23.1,23.1,32,32,32,32,0,*68

• Field 1-4: Channel 1-4 power.
• Field 5-8: Debug information.
• Field 9: Spectrum identification.
• Field 10: End of the data frame.

9. Usage Summary

1. Fixed. Install fixation with M3 screws.
2. Power supply. Use XT30, supply voltage 5-17V, maximum 17V.
3. Data Connection. Connect the DuPont line TTL serial port of this product to the flight control GNSS serial port. Turn off the power, connect the TTL to the Pixhawk, and observe the GPS work display in the flight control interface after the restart. The terminal must be placed in an area that can normally receive satellite signals.

10. Disclaimer

This product is designed to improve the security of satellite navigation. Please comply with relevant laws and regulations during use. Any illegal activities using the product are prohibited.