Miniature Four-Element Array Integrated Navigation Anti-Jamming Unit

 

1. Overview

 

This document specifies the product specification requirements for the AJU-4050 Miniature Four-Element Array Integrated Navigation Anti-Jamming Unit (hereinafter referred to as the "Anti-Jamming Unit").

 

The Anti-Jamming Unit is mainly composed of an array antenna, an anti-jamming processing module, a built-in receiver, and supporting cables. It supports the reception, amplification, down-conversion, filtering, anti-jamming processing, and up-conversion output of 4-channel signals at BDS_B1, GPS L1, and Galileo E1 frequency points.

 

The built-in receiver supports PVT (Position, Velocity, Time) solution output. It has a power supply range of DC9V~36V and is capable of resisting 1 to 3 incoming interferences of various types such as broadband, narrowband, pulse, and frequency sweep suppression.

 

2.  Product Composition

The product consists of an anti-jamming unit has test cables, and random documents.

The composition details are as follows:

 

 

Product Drawings of Anti-Jamming Unit

 

Figure 2-1 Product Drawings of Anti-Jamming Unit

 Figure 2-2 Dimensions Drawing of Anti-Jamming Unit

1. Product Specification

1.1 Main Functions

 

1). Supports reception of BDS_B1, GPS L1, and Galileo E1 frequency signals.

 

2). Possesses the capability to resist various suppression interferences such as wideband, narrowband, sweep, and pulse, as well as combinations of the above interferences within the B1, L1, and E1 frequency bands.

 

3). Supports soft bypass and anti-interference mode output, which users can flexibly select and switch via the serial port.

 

4). Built-in receiver, capable of outputting positioning solution results after anti-interference processing.

 

1.2 Main Technical Indicators

1) Frequency Point Anti-jamming Capability

(1) Number of Channels: 4 channels, supporting BDS_B1, GPS L1, and Galileo E1 frequency bands;

(2) Anti-jamming Types: Capable of resisting various suppression interferences such as broadband, frequency-sweeping, and pulse in B1/L1/E1 frequency bands, as well as the combination of the above interferences;

(3)Number of Anti-multiple Interferences: 1 to 3 interference sources in different directions; (4)Anti-single Broadband Interference Capability: Interference-to-signal ratio ≥ 95dB@-130dBm; (5)Anti-three Broadband Interferences Capability: Interference-to-signal ratio ≥ 80dB@-130dBm; (6)Anti-jamming Spatial Range: Azimuth 0°~360°, Elevation -10°~90°.

Note: The elevation angle is defined as the angle between the spatial vector of the anti-jamming unit and the horizontal plane, with the body coordinate system y-axis as the pitch axis, the counterclockwise direction is "+", and the clockwise direction is "-".

 

2) RF Output

 

(1) RF Output Power: -55dBm~-70dBm;

 

(2) RF Impedance: 50 ohms;

(3) Output VSWR: ≤2.0.

1) Built-in Receiver Specifications

The built-in receiver supports receiving and resolving signals at B1, L1, and E1 frequency points, and outputs positioning results through a data interface:

(1) Positioning Accuracy: Horizontal error ≤7m, vertical error ≤9m (95%, PDOP≤4); (2)Velocity Measurement Accuracy: ≤0.2m/s (95%).

2) Antenna Port Burnout Resistance: ≥10W.

3) Operating Voltage Range: DC9V~36V.

4) Average Power Consumption: ≤6W.

1.1 External Interfaces

1) 1 pcs J30J power data interface, which is used for power supply and data commissioning. The power data interface is a J30J-9ZK connector, with a total of 9PIN signal definitions as follows.

Table 3-1 Power Data Interface Definition Table

 

 

 

1) 1 pcs SMA-K RF output interface, which is used for outputting B1/L1/E1 frequency signals after antenna amplification and anti-interference processing. The definition of the RF signal output interface is shown in the following table:

Table 3-2 Definition Table of RF Signal Output Interface

 

 

1.1 Structural Design

1) Dimensions: Length × Width × Height: 50mm × 50mm × 21.3mm(±0.5mm).

2) The main body of the product is in natural aluminum color with conductive oxidation treatment, and the radome is in silver-gray / white color.

3) Product Weight: ≤120g.

4) Mounting Interface: As shown in Figure 2-2, there are 4 mounting screw holes on the side of the antenna, which are 4 M2.5 screw holes with a depth of 2.4mm.

1.1 Reliability

1) Mean Time Between Failures (MTBF): ≥2000h;

2) Continuous Operating Time: ≥24h.

1.2 Environmental Adaptability

1) Operating Temperature: -40℃~+70℃, 10%90%RH (no condensation);

2) Storage Environment: -45℃~+85℃, 10%~95%RH (no condensation);

3) Waterproof Rating: Not lower than IP65.

1.3 Shock and Vibration

Shock Test: Execute in accordance with ISO 19453-3:2018 "Environmental Test Methods for Civil Small and Light Unmanned Aircraft Systems - Part 3: Shock Test".

 

Vibration Test: Execute in accordance with ISO 5309:2023 "Vibration Test Methods for Civil Small and Light Unmanned Aircraft Systems".

 

2. Packaging

The packaging box is made of paper, with an internal shockproof and drop-resistant buffer design.

 

 

 

5 Installation Precautions

 

(1) The bottom surface of the anti-interference antenna is a metal heat dissipation surface. When installing, ensure that the bottom surface has good heat dissipation conditions. It is recommended to closely fit the bottom surface with other metal planes during installation to achieve better heat dissipation effects, or install it overhead to ensure air flow at the bottom.

 

(2) The top surface of the anti-interference antenna is the GNSS signal receiving antenna plane. To ensure good GNSS signal reception, when installing the anti-interference antenna on the carrier, it is necessary to ensure that its top surface directly faces the open sky and is unobstructed.

 

 

(3) When the anti-interference antenna is installed inside the body for use, the part of the body corresponding to the top surface of the antenna must be made of wave-transmitting materials and have a wave transmission rate of no less than 92% in the L-band.