Aircraft radar target identification system

Abstract

An aircraft radar target identification system disclosed by the present invention comprises a control center and aircraft equipment, the aircraft equipment is in signal connection with a data acquisition module, the data acquisition module is in signal connection with a signal processing module, the signal processing module is in signal connection with an electromagnetic wave transceiving module, and the data acquisition module is in signal connection with a feature extraction unit. Objects are identified through radar reflection and echoes of an aircraft equipment transceiving electromagnetic wave module, data information feature extraction is performed through a feature extraction unit in signal connection with a data acquisition module, and feature extraction information is sent to a control center through a network by the data acquisition module. The control center carries out data feature recognition through a feature recognition unit in signal connection with the data processing system, and transmits an obtained intermediate result which is ensured to be irreversible to a far end through a network, so that the risk of privacy disclosure is avoided, information of a recognized target object and aircraft equipment is transmitted and protected, and the risk of diffusion is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft radar target recognition, and in particular relates to an aircraft radar target recognition system. Background Art

[0002] Aircraft radar refers to the general term for various radar devices installed on aircraft, which are mainly used to detect, locate and track targets; these radar devices play a key role in various application scenarios of aircraft. Radar detects targets by actively emitting electromagnetic waves and receiving the reflected signals; radar is mainly composed of a transceiver system, a signal processing system and a data processing system; the transceiver system is responsible for emitting and receiving electromagnetic waves, the signal processing system analyzes and processes the received signals, and the data processing system presents the processed signals to the control center in an easy-to-understand manner to assist in analysis and decision-making.

[0003] In the prior art, when an aircraft radar target recognition system is identifying and tracking, the basic information of the identified and tracked target object is sent to the control center. During the network transmission process, encryption may be used to enhance security for security reasons. Although the transmission process can be encrypted to ensure security, it will also be decrypted before processing after reaching the control center. There is a risk of diffusion, making the information of the identified target object easy to be leaked, which is not conducive to protecting the information data of the target object and aircraft equipment.

[0004] Therefore, it is necessary to invent an aircraft radar target recognition system to solve the above problems, which can be transferred to the control center through feature extraction operations, and the obtained irreversible intermediate results can be transmitted to the remote end through the network to ensure that there is no risk of privacy leakage. Summary of the invention

[0005] In view of the above problems, the present invention provides an aircraft radar target recognition system to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: an aircraft radar target recognition system, comprising a control center and an aircraft device, the aircraft device is signal-connected to a data acquisition module, the data acquisition module is signal-connected to a signal processing module, the signal processing module is signal-connected to a transceiver electromagnetic wave module, and the data acquisition module is signal-connected to a feature extraction unit;

[0007] The control center is signal-connected with a control system, the control system is signal-connected with a data processing system, the data processing system is signal-connected with a target feature unit, a target shape unit and a target motion law unit, the data processing system is also signal-connected with a target position unit, a target speed unit and a target acceleration unit, the data processing system is signal-connected with a data decision module, the data processing system is also signal-connected with a feature recognition unit, and the feature recognition unit is signal-connected with a feature application unit.

[0008] Preferably, the aircraft device identifies the object through the radar reflection and echo of the electromagnetic wave transceiver module, processes the received signal through the signal processing module, extracts the data information features through the feature extraction unit connected by the data acquisition module signal, and the aircraft device sends the feature extraction information to the control center through the network through the data acquisition module;

[0009] The specific way in which radar reflections and echoes are used to identify objects is as follows:

[0010] The radar transmitter transmits electromagnetic waves into space through the antenna. When the electromagnetic waves encounter an object, part of the energy will be reflected back. Suppose the power of the electromagnetic waves emitted by the radar is Pt, the antenna gain is G, the distance between the target and the radar is R, and the radar scattering cross section (RCS) of the target is k.

[0011] According to the radar equation, the echo power Pr received by the radar is:

[0012]

[0013] Where u is the wavelength of the transmitted electromagnetic wave; the received echo power is proportional to the transmitted power, the square of the antenna gain, the radar cross section of the target, and inversely proportional to the fourth power of the distance. Different objects have different radar cross sections k, which are determined by factors such as the shape, size, material, and surface roughness of the object. By analyzing the received echo power, time delay, and frequency change information, the distance, azimuth, and speed of the target object can be obtained to achieve object identification;

[0014] The specific way the signal processing module performs processing is as follows: The received radar echo signal usually contains noise and clutter. The main task of the signal processing module is to filter, amplify and digitize the received signal;

[0015] Filtering: Bandpass filter, whose frequency response p can be used to describe the processing method of signals of different frequencies. Let the input signal be x, its Fourier transform be X, and the Fourier transform of the output signal y after the filter is Y=p*X;

[0016] Amplification: Use an amplifier to adjust the gain of the signal. Suppose the gain of the amplifier is A, the input signal is Vin, and the output signal Vout = A Vin ;

[0017] Digitization: Converting analog signals into digital signals is achieved through an analog-to-digital converter (ADC). Let the sampling frequency be f. According to the Nyquist-Shannon sampling theorem, in order to fully restore the signal, the sampling frequency should be greater than twice the highest frequency of the signal. The sampled digital signal can be easily processed in subsequent digital signal processing.

[0018] Preferably, the control center performs data feature recognition via a feature recognition unit connected to a data processing system signal, and the data processing system performs feature application on the feature-recognized data to obtain basic information of the target object.

[0019] Preferably, the basic information includes target characteristics, target shape, target motion law, target position, target speed and target acceleration.

[0020] Preferably, the data processing system sends the information of the target object to the data decision module after judgment, and controls the subsequent tasks of the aircraft equipment through the data decision module.

[0021] Preferably, the data decision system determines whether the object identified by the aircraft device is a target object. If it is a target object, the data decision system controls the aircraft device to track the target object in real time. If it is not a target object, the data decision system controls the aircraft device to continue to identify the object by sending and receiving electromagnetic waves.

[0022] Technical effects and advantages of the present invention:

[0023] 1. The present invention identifies objects through radar reflection and echo of the electromagnetic wave transceiver module of the aircraft equipment, processes the received signal through the signal processing module, extracts data information features through the feature extraction unit connected by the data acquisition module signal, the aircraft equipment sends the feature extraction information to the control center through the network through the data acquisition module, the control center performs data feature recognition through the feature recognition unit connected by the data processing system signal, the data processing system performs feature application on the feature recognized data to obtain basic information of the target object, transfers it to the control center through the feature extraction operation, and transmits the obtained irreversible intermediate result to the remote end through the network, ensuring that there is no risk of privacy leakage, so that the information of the identified target object and the aircraft equipment is transmitted and protected, avoiding the risk of diffusion.

[0024] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0027] Figure 2 It is a schematic diagram of the aircraft equipment module of the present invention;

[0028] Figure 3 It is a schematic diagram of the control center module of the present invention;

[0029] Figure 4 It is a schematic diagram of the data processing system module of the present invention;

[0030] Figure 5 It is a flow chart of the target recognition system of the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The present invention provides Figure 1-5 An aircraft radar target recognition system shown includes a control center and an aircraft device, wherein the aircraft device is signal-connected to a data acquisition module, the data acquisition module is signal-connected to a signal processing module, the signal processing module is signal-connected to an electromagnetic wave transceiver module, and the data acquisition module is signal-connected to a feature extraction unit;

[0033] The control center is signal-connected with a control system, the control system is signal-connected with a data processing system, the data processing system is signal-connected with a target feature unit, a target shape unit and a target motion law unit, the data processing system is also signal-connected with a target position unit, a target speed unit and a target acceleration unit, the data processing system is signal-connected with a data decision module, the data processing system is also signal-connected with a feature recognition unit, and the feature recognition unit is signal-connected with a feature application unit;

[0034] The aircraft's airborne radar system transmits electromagnetic beams to scan targets and receive echo signals, and then uses signal processing to send information to the control center, which tracks and identifies targets. Target tracking is mainly achieved by measuring the target's position, velocity, and acceleration parameters, while target identification is achieved by analyzing the target's characteristics, shape, and motion patterns.

[0035] The aircraft equipment identifies the object through the radar reflection and echo of the electromagnetic wave transceiver module, processes the received signal through the signal processing module, and extracts the data information feature through the feature extraction unit connected by the data acquisition module signal. The aircraft equipment sends the feature extraction information to the control center through the network through the data acquisition module, and the control center performs data feature recognition through the feature recognition unit connected by the data processing system signal. The data processing system performs feature application on the data after feature recognition to obtain the basic information of the target object, transfers it to the control center through the feature extraction operation, and transmits the obtained irreversible intermediate result to the remote end through the network to ensure that there is no risk of privacy leakage, so that the information of the identified target object and the aircraft equipment is transmitted and protected to avoid the risk of diffusion.

[0036] The specific way in which radar reflections and echoes are used to identify objects is as follows:

[0037] The radar transmitter transmits electromagnetic waves into space through the antenna. When the electromagnetic waves encounter an object, part of the energy will be reflected back. Suppose the power of the electromagnetic waves emitted by the radar is Pt, the antenna gain is G, the distance between the target and the radar is R, and the radar scattering cross section (RCS) of the target is k.

[0038] According to the radar equation, the echo power Pr received by the radar is:

[0039]

[0040] Where u is the wavelength of the transmitted electromagnetic wave; the received echo power is proportional to the transmitted power, the square of the antenna gain, the radar cross section of the target, and inversely proportional to the fourth power of the distance. Different objects have different radar cross sections k, which are determined by factors such as the shape, size, material, and surface roughness of the object. By analyzing the received echo power, time delay, and frequency change information, the distance, azimuth, and speed of the target object can be obtained to achieve object identification;

[0041] The specific way the signal processing module performs processing is as follows: The received radar echo signal usually contains noise and clutter. The main task of the signal processing module is to filter, amplify and digitize the received signal;

[0042] Filtering: Bandpass filter, whose frequency response p can be used to describe the processing method of signals of different frequencies. Let the input signal be x, its Fourier transform be X, and the Fourier transform of the output signal y after the filter is Y=p*X;

[0043] Amplification: Use an amplifier to adjust the gain of the signal. Suppose the gain of the amplifier is A, the input signal is Vin, and the output signal Vout = A Vin ;

[0044] Digitization: Converting analog signals into digital signals is achieved through an analog-to-digital converter (ADC). Let the sampling frequency be f. According to the Nyquist-Shannon sampling theorem, in order to fully restore the signal, the sampling frequency should be greater than twice the highest frequency of the signal. The sampled digital signal can be easily processed in subsequent digital signal processing.

[0045] As a specific embodiment of the present invention, the aircraft device identifies objects through radar reflection and echo of the electromagnetic wave transceiver module, processes the received signal through the signal processing module, and extracts data information features through the feature extraction unit connected to the data acquisition module signal. The aircraft device sends the feature extraction information to the control center through the network through the data acquisition module.

[0046] As a specific implementation of the present invention, the control center performs data feature recognition through a feature recognition unit connected to a data processing system signal, and the data processing system performs feature application on the feature-recognized data to obtain basic information of the target object.

[0047] As a specific implementation of the present invention, the basic information includes target characteristics, target shape, target motion law, target position, target speed and target acceleration.

[0048] As a specific implementation of the present invention, the data processing system sends the information of the target object to the data decision module after judgment, and controls the subsequent tasks of the aircraft equipment through the data decision module.

[0049] An aircraft radar target recognition system operation process:

[0050] The aircraft equipment identifies objects through radar reflection and echo of the electromagnetic wave transceiver module, and processes the received signal through the signal processing module. The data acquisition module sends the object information to the control center through the network;

[0051] The control center processes the data through the data processing system to obtain the basic information of the target, including target characteristics, target shape, target motion law, target position, target speed and target acceleration;

[0052] The data decision system determines whether the object identified by the aircraft equipment is a target object. If it is a target object, the data decision system controls the aircraft equipment to track the target object in real time. If it is not a target object, the data decision system controls the aircraft equipment to continue to identify the object by sending and receiving electromagnetic waves. The aircraft radar target recognition system can track and identify multiple targets at the same time, achieving rapid response and processing of multiple targets.

[0053] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An aircraft radar target recognition system, comprising a control center and aircraft equipment, characterized in that: The aircraft device is signal-connected to a data acquisition module, the data acquisition module is signal-connected to a signal processing module, the signal processing module is signal-connected to an electromagnetic wave transceiver module, and the data acquisition module is signal-connected to a feature extraction unit; The control center is signal-connected with a control system, the control system is signal-connected with a data processing system, the data processing system is signal-connected with a target feature unit, a target shape unit and a target motion law unit, the data processing system is also signal-connected with a target position unit, a target speed unit and a target acceleration unit, the data processing system is signal-connected with a data decision module, the data processing system is also signal-connected with a feature recognition unit, and the feature recognition unit is signal-connected with a feature application unit.

2. The aircraft radar target recognition system according to claim 1, characterized in that: The aircraft device identifies the object through the radar reflection and echo of the electromagnetic wave transceiver module, processes the received signal through the signal processing module, extracts the data information features through the feature extraction unit connected by the data acquisition module signal, and sends the feature extraction information to the control center through the network through the data acquisition module; The specific way in which radar reflections and echoes are used to identify objects is as follows: The radar transmitter transmits electromagnetic waves into space through the antenna. When the electromagnetic waves encounter an object, part of the energy will be reflected back. Suppose the power of the electromagnetic waves emitted by the radar is Pt, the antenna gain is G, the distance between the target and the radar is R, and the radar scattering cross section (RCS) of the target is k. According to the radar equation, the echo power Pr received by the radar is: Where u is the wavelength of the transmitted electromagnetic wave; the received echo power is proportional to the transmitted power, the square of the antenna gain, the radar cross section of the target, and inversely proportional to the fourth power of the distance. Different objects have different radar cross sections k, which are determined by factors such as the shape, size, material, and surface roughness of the object. By analyzing the received echo power, time delay, and frequency change information, the distance, azimuth, and speed of the target object can be obtained to achieve object identification; The specific way in which the signal processing module performs processing is as follows: the received radar echo signal usually contains noise and clutter, and the main task of the signal processing module is to filter, amplify and digitize the received signal; Filtering: Bandpass filter, whose frequency response p can be used to describe the processing method of signals of different frequencies. Let the input signal be x, its Fourier transform be X, and the Fourier transform of the output signal y after the filter is Y=p*X; Amplification: Use an amplifier to adjust the gain of the signal. Suppose the gain of the amplifier is A, the input signal is Vin, and the output signal Vout = A Vin ; Digitization: Converting analog signals into digital signals is achieved through an analog-to-digital converter (ADC). Let the sampling frequency be f. According to the Nyquist-Shannon sampling theorem, in order to fully restore the signal, the sampling frequency should be greater than twice the highest frequency of the signal. The sampled digital signal can be easily processed in subsequent digital signal processing.

3. The aircraft radar target recognition system according to claim 1, characterized in that: The control center performs data feature recognition through a feature recognition unit connected to the data processing system signal, and the data processing system performs feature application on the feature-recognized data to obtain basic information of the target object.

4. The aircraft radar target recognition system according to claim 1, characterized in that: The basic information of the target object includes target characteristics, target shape, target motion law, target position, target speed and target acceleration.

5. The aircraft radar target recognition system according to claim 1, characterized in that: The data processing system sends the information of the target object to the data decision module after judgment, and controls the subsequent tasks of the aircraft equipment through the data decision module.

6. The aircraft radar target recognition system according to claim 1, characterized in that: The data decision system determines whether the object identified by the aircraft device is a target object. If it is a target object, the data decision system controls the aircraft device to track the target object in real time. If it is not a target object, the data decision system controls the aircraft device to continue identifying the object by sending and receiving electromagnetic waves.

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