A radar monitoring system for small targets in near space

Abstract

The present invention relates to a near-air small target radar monitoring system, including a power module and an azimuth turntable module, wherein the power module is electrically connected with an antenna module, a channel module, a signal processing module and a display control module, the power module supplies power to the entire radar system, the azimuth turntable module is provided with an azimuth turntable, the antenna module, the channel module and the signal processing module are all arranged on the azimuth turntable, the azimuth turntable is connected with a servo motor, the servo motor drives the azimuth turntable to rotate and transmits the azimuth information to the display control module in real time. Under the coordinated work of each module, the present invention can accurately detect birds in places such as airports, farms and substations, the one-dimensional active phased array antenna has a long detection distance, a large pitch angle and a wide coverage range, and can effectively detect and locate birds in real time; through the signal processing and conversion of each module, the detection target can be accurately located, the moving trace can be analyzed, and the bird-repelling work can be effectively carried out.

Description

Technical Field

[0001] The invention relates to a near-air small target radar monitoring system, belonging to the technical field of radar bird detection. Background Art

[0002] Bird repelling is an important task in places such as airports, farms and substations. Take the airport as an example. During the takeoff and landing of aircraft, collisions with birds and other flying animals often occur, resulting in great loss of life and property. In order to prevent the potential safety hazards caused by birds and other flying animals in places such as airports, farms or substations, staff should frequently carry out bird repelling work. In order to make the bird repelling work thorough, the location of the birds should be accurately detected before repelling, and real-time fixed-point and positioning repelling should be carried out. Therefore, it is extremely important to accurately detect the location of the birds in advance. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a near-air small target radar monitoring system, and its specific technical solution is as follows:

[0004] The near-air small target radar monitoring system comprises a power module and an azimuth turntable module, wherein the power module is electrically connected to an antenna module, a channel module, a signal processing module and a display control module, and the antenna module, the channel module and the signal processing module are arranged on the azimuth turntable module.

[0005] The channel module is composed of a frequency synthesizer and a receiver. The excitation signal generated by the frequency synthesizer is sent to the antenna module through the feeding network. After the excitation signal detects the target, it forms an echo signal which is received by the antenna module and forms a sum and difference beam through the feeding network. The sum and difference beam is converted into an intermediate frequency signal by the receiver and then sent to the signal processing module.

[0006] The antenna module radiates the excitation signal outward through the array antenna. The radiated excitation signal forms an echo signal after detecting the target and is received by the array antenna.

[0007] The signal processing module includes a signal processor and a communication controller. The signal processor collects intermediate frequency signals of different elevation angles input by the channel module, and performs distance detection, angle detection and track tracking on the detected target according to the received intermediate frequency signals. The signal processor sends the detected and processed target information to the display control module via the communication controller.

[0008] The display control module is provided with a human-computer interaction interface. The display control module displays target information and issues a task of expelling the detected target by running the upper computer software.

[0009] Furthermore, the array antenna is a one-dimensional active phased array antenna, and the one-dimensional active phased array antenna is provided with 128 antenna units, and the 128 antenna units form an antenna array plane.

[0010] Furthermore, the signal processing module is provided with a timing control module, and the timing control module performs timing control on echo signal acquisition and radar system.

[0011] Furthermore, the signal processor is connected to an analog-to-digital converter, and the intermediate frequency signal input by the channel module is converted into a digital signal by the analog-to-digital converter. The signal processor receives the converted digital signal and performs azimuth and trajectory processing on the detected target.

[0012] Furthermore, the azimuth turntable module is provided with an azimuth turntable, the antenna module, channel module and signal processing module are all arranged on the azimuth turntable, the azimuth turntable is connected to a servo motor, the servo motor drives the azimuth turntable to rotate and transmits the azimuth information to the display control module in real time.

[0013] Furthermore, the model of the frequency synthesizer is SLMF315.

[0014] Furthermore, the model of the analog-to-digital converter is MAX19542.

[0015] Beneficial effects of the present invention:

[0016] With the cooperation of various modules, the present invention can accurately detect birds in places such as airports, farms and substations. The one-dimensional active phased array antenna has a long detection distance, a large pitch angle, and a wide coverage range, and can effectively detect and locate birds in real time; through signal processing and conversion of each module, the detection target can be accurately located, and the movement trace can be analyzed, which helps to effectively carry out the bird repelling work. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the present invention,

[0018] Figure 2 It is a structural block diagram of a one-dimensional active phased array antenna of the present invention. DETAILED DESCRIPTION

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0020] like Figure 1As shown, the near-air small target radar monitoring system of the present invention includes a power module and an azimuth turntable module. The power module is electrically connected to an antenna module, a channel module, a signal processing module and a display control module. The power module supplies power to the entire radar system, and adopts a 220V AC power supply mode. The 220V power supply performs secondary voltage conversion and supplies power to each module. The azimuth turntable module is provided with an azimuth turntable, and the antenna module, the channel module and the signal processing module are all arranged on the azimuth turntable. The azimuth turntable is connected to a servo motor, and the servo motor drives the azimuth turntable to rotate and transmits the azimuth information to the display control module in real time. The channel module is composed of a frequency synthesizer and a receiver. The excitation signal generated by the frequency synthesizer is sent to the antenna module through a feed network. The antenna module radiates the excitation signal outward through a one-dimensional active phased array antenna. The radiated excitation signal forms an echo signal after detecting the target and is received again by the one-dimensional active phased array antenna. Among them, the antenna array of the one-dimensional active phased array antenna adopts a narrow-side crack array, which is composed of 128 cracks, and the crack unit spacing is 12mm. The back of the antenna is composed of 128 TR channels. After the 16 module waveguide outputs pass through the waveguide synthesis and the sum-difference network, the sum and difference signals are output, such as Figure 2As shown. The operating frequency of the one-dimensional active phased array antenna is 16GHz~18GHz, the antenna gain is not less than 28dB, the effective isotropic radiated power is not less than 72dBm, the ratio of the receiving antenna gain G to the receiving system noise temperature T is not less than 7dB / K, the azimuth beam width is not more than 5°, the elevation beam width is not more than 7°, the beam scanning range is not less than ±60°, the side lobe level is not more than -18dB, and its polarization form is vertical polarization. Therefore, the one-dimensional active phased array antenna can achieve a detection distance of 6km, 360° azimuth coverage and 0°-50° elevation angle coverage, with a distance detection accuracy of 10m, an angle detection accuracy of 1°, and a minimum detectable target moving speed of 2m / s. The echo signal is formed into a sum and difference beam by passing through the feeding network, and the sum and difference beam is converted to an intermediate frequency signal by the receiver and sent to the signal processing module. The signal processing module includes a signal processor and a communication controller. The signal processor is connected to an analog-to-digital converter. The intermediate frequency signals of different elevation angles input by the channel module are converted into digital signals by the analog-to-digital converter. The signal processor receives the converted digital signals and performs distance detection, angle detection and track tracking on the detected target. The signal processor sends the detected and processed target information to the display control module through the communication controller. Among them, the main function of the signal processor is to detect moving targets under various clutter backgrounds at low altitudes, and give the characteristics of moving targets, including the target's fuzzy distance, azimuth, fuzzy speed and intensity, so that other parts of the subsequent radar can perform target distance defuzzification, speed defuzzification, data processing, etc. to form target tracks and classification. The display control module is equipped with a human-computer interaction interface. The display control module displays target information by running the upper computer software. The staff issues the task of expelling the detected target on the human-computer interaction interface. The display control module also has the functions of system parameter setting, DSP program loading, data uploading, intermediate processing result display and system operation status monitoring.

[0021] The near-air small target radar monitoring system of the present invention is divided into a normal working mode, a system calibration mode and a full receiving mode. In the normal working mode, the one-dimensional active phased array antenna realizes 360° rotation under the rotation of the azimuth turntable, and adopts the TWS mode, that is, the scanning and tracking mode to search and track the airspace bird targets, and displays the target azimuth and target track on the display control module. In the system calibration mode, the radio frequency system of the antenna module transmits the transmission signal to the receiving system through the calibration channel for self-closed loop testing, and performs self-checking and correction on the state parameters of the system. In the full receiving mode, the signal generation module does not output the excitation signal, and completes the calibration of the radar system receiving thermal noise power level. After the radar equipment is installed, the horizontal adjustment of the antenna array surface is first completed. After the horizontal adjustment is completed, the radar system is powered on to initialize the system, and the display control module completes program loading, system status self-checking and other operations by running the host computer software. After the radar system is initialized, the radar system enters the waiting mode, and the operator issues the command parameters through the human-computer interaction interface. After receiving the command parameters, each module of the radar system enters the working state, rotates the one-dimensional active phased array antenna, searches, intercepts, tracks and uploads target information. When the operator issues a stop command, the radar system returns to the standby mode and waits for the command to be issued or the power to be cut off.

[0022] With the cooperation of various modules, the present invention can accurately detect birds in places such as airports, farms and substations. The one-dimensional active phased array antenna has a long detection distance, a large pitch angle, and a wide coverage range, and can effectively detect and locate birds in real time; through signal processing and conversion of each module, the detection target can be accurately located, and the movement trace can be analyzed, which helps to effectively carry out the bird repelling work.

[0023] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A near-air small target radar monitoring system, characterized in that: The invention comprises a power module and an azimuth turntable module, wherein the power module is electrically connected to an antenna module, a channel module, a signal processing module and a display control module, wherein the antenna module, the channel module and the signal processing module are arranged on the azimuth turntable module, wherein the channel module is composed of a frequency synthesizer and a receiver, wherein an excitation signal generated by the frequency synthesizer is sent to the antenna module through a feeding network, and after the excitation signal detects a target, an echo signal is formed which is received by the antenna module and forms a sum-difference beam through the feeding network, and the sum-difference beam is converted to an intermediate frequency signal by the receiver and then sent to the signal processing module, wherein the antenna module transmits the excitation signal through an array antenna Radiate outward, the radiated excitation signal forms an echo signal after detecting the target and is received by the array antenna, the signal processing module includes a signal processor and a communication controller, the signal processor collects the intermediate frequency signals of different elevation angles input by the channel module, and performs distance detection, angle detection and track tracking on the detected target according to the received intermediate frequency signal, the signal processor sends the detected target information to the display control module through the communication controller, the display control module is provided with a human-computer interaction interface, and the display control module displays the target information and issues the task of expelling the detected target by running the upper computer software; The array antenna is a one-dimensional active phased array antenna, and the one-dimensional active phased array antenna is provided with 128 antenna units, and the 128 antenna units form an antenna array surface; The signal processing module is provided with a timing control module, and the timing control module performs timing control on the echo signal acquisition and the radar system; The signal processor is connected to an analog-to-digital converter, and the intermediate frequency signal input by the channel module is converted into a digital signal by the analog-to-digital converter. The signal processor receives the converted digital signal and performs azimuth and trajectory processing on the detected target; The azimuth turntable module is provided with an azimuth turntable, the antenna module, the channel module and the signal processing module are all arranged on the azimuth turntable, the azimuth turntable is connected to a servo motor, the servo motor drives the azimuth turntable to rotate and transmits the azimuth information to the display control module in real time.

2. The near-air small target radar monitoring system according to claim 1 is characterized in that: The model of the frequency synthesizer is SLMF315.

3. The near-air small target radar monitoring system according to claim 1 is characterized in that: The model of the analog-to-digital converter is MAX19542.

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