A method and system for simulating radar returns from a schiim I type waver target

Abstract

The application discloses a radar echo simulation method and system of Swerling I fluctuation target, wherein the method comprises the following steps: calculating the maximum radar scattering cross section area of the target capable of being simulated according to the radar echo simulation system gain obtained by measurement, and generating radar scattering cross section area data according to the probability distribution corresponding to the Swerling I fluctuation; performing normalization processing on the radar scattering cross section area data based on the maximum radar scattering cross section area, and then performing quantization processing according to the AD bit number of the radar echo simulation system receiver to obtain radar scattering cross section area modulation data subject to the Swerling I fluctuation; and performing radar scattering cross section area modulation on the radar sampling signal received by the radar echo simulation system receiver based on the radar scattering cross section area modulation data, so that the radar echo of the simulated target is subject to the Swerling I fluctuation. Compared with the conventional method for realizing target simulation by using a program-controlled amplifier and an attenuator, the method has the advantages of high precision and controllable fluctuation characteristics.

Description

Technical Field

[0001] This invention relates to the field of radar signal processing technology, and in particular to a radar echo simulation method and system for Schwerin I type undulating targets. Background Technology

[0002] In the research, development, and use of modern radar systems, radar echo simulation systems are required to provide radar target echo signals for testing and verification of radar system performance. Currently, radar echo simulation systems typically rely on digital radio frequency storage to acquire, store, delay, and forward signals, thereby generating target echo signals at a specified radar distance. The simulation of target echo RCS (Radar Cross Section) fluctuations is usually achieved using programmable amplifiers and attenuators. This method has two main problems:

[0003] First, due to the limitations of amplifier and attenuator accuracy, the target echo RCS obtained by this method exhibits "step-like" fluctuation characteristics, which differs significantly from the fluctuations of the real target.

[0004] Secondly, the RCS fluctuation characteristics obtained by this method are random, and the statistical characteristics follow a Gaussian distribution, while the RCS fluctuation characteristics of the real target usually follow Schwerin fluctuations, and there is a significant difference between the two. Summary of the Invention

[0005] To address the aforementioned problems, this invention proposes a radar echo simulation method and system for Schwerin Type I undulating targets. This system can be used in radar target simulation systems to simulate the radar echoes of Schwerin Type I undulating targets. This invention employs digital methods to generate RCS scattering data that conforms to the Schwerin Type I undulation characteristics and modulates it onto the radar signal received by the radar echo simulation system. This results in radar echo data at the radar that conforms to the Schwerin Type I undulation characteristics of the real target, achieving high simulation accuracy and effectively supporting the research, development, and application requirements of radar systems.

[0006] The technical solution adopted in this invention is as follows:

[0007] A method for simulating radar echoes of Schwerin I type undulating targets includes the following steps:

[0008] S1. Calculate the maximum radar cross section of the simulated target based on the radar echo simulation system gain obtained from the measurement, and generate radar cross section data according to the probability distribution corresponding to Schwerin type I fluctuations.

[0009] S2. The radar cross section data is normalized based on the maximum value of the radar cross section, and then quantized according to the number of AD bits of the radar echo simulation system receiver to obtain radar cross section modulation data that follows Schwerin type I fluctuation.

[0010] S3. Based on the radar cross section modulation data, perform radar cross section modulation on the radar sampling signal received by the radar echo simulation system receiver so that the radar echo of the simulated target conforms to Schwerin type I fluctuation.

[0011] Further, in step S1, the method for calculating the maximum radar cross-section that can simulate the target based on the measured radar echo simulation system gain includes:

[0012]

[0013] in, G represents the maximum radar cross-section of the target that the radar echo simulation system can simulate, G is the gain of the radar echo simulation system, and λ is the radar operating wavelength.

[0014] Furthermore, in step S1, the method for generating radar cross-section data based on the probability distribution corresponding to Schwerin type I fluctuations includes:

[0015] S101. Set the maximum value σ of the radar cross-section of the target to be simulated. max Minimum value σ min and mean σ0, where

[0016] S102. Calculate the amplitude value corresponding to the maximum radar cross-section of the target to be simulated:

[0017]

[0018] Calculate the amplitude value corresponding to the minimum radar cross section of the target to be simulated:

[0019]

[0020] S103. Generate amplitude value U min and U max Uniformly distributed random numbers within a range:

[0021] u = U min +(U max -U min )*rand(1)

[0022] Where rand(1) is a random number that follows a uniform distribution in the range [0,1].

[0023] S104. Generate radar cross section data σ=-σ0×ln(1-u).

[0024] Further, in step S2, the method for normalizing the radar cross-section data based on the maximum value of the radar cross-section includes:

[0025]

[0026] in, This is the normalized value of the radar cross section data;

[0027] Methods for quantization based on the AD bit count of the radar echo analog system receiver include:

[0028]

[0029] Where, σ * To conform to the radar cross section modulation data of Schwerin type I fluctuation, b is the number of AD bits of the radar echo simulator receiver.

[0030] Furthermore, in step S3, the method for performing radar cross section modulation on the radar sampling signal received by the radar echo simulation system receiver includes:

[0031] y t =σ * ×s t

[0032] Among them, y t To conform to the radar echo data of targets exhibiting Schwerin I-type undulations, s t t represents the radar sampling signal received by the radar echo simulation system receiver, and t represents the current sampling time.

[0033] A radar echo simulation system for Schwerin Type I undulating targets includes:

[0034] The radar cross section data calculation module is configured to calculate the maximum radar cross section of the simulated target based on the measured radar echo simulation system gain, and generate radar cross section data according to the probability distribution corresponding to Schwerin type I fluctuations.

[0035] The normalization and quantization processing module is configured to normalize the radar cross section data based on the maximum value of the radar cross section, and then quantize it according to the number of AD bits of the radar echo simulation system receiver to obtain radar cross section modulation data that follows Schwerin type I fluctuation.

[0036] The radar echo data generation module is configured to perform radar cross section modulation on the radar sampling signal received by the radar echo simulation system receiver based on the radar cross section modulation data, so that the radar echo of the simulated target conforms to the Schwerin type I fluctuation.

[0037] Furthermore, in the radar cross-section data calculation module, the method for calculating the maximum radar cross-section that can simulate the target based on the measured radar echo simulation system gain includes:

[0038]

[0039] in, G represents the maximum radar cross-section of the target that the radar echo simulation system can simulate, G is the gain of the radar echo simulation system, and λ is the radar operating wavelength.

[0040] Furthermore, the method for generating radar cross section data based on the probability distribution corresponding to Schwerin type I fluctuations in the radar cross section data calculation module includes:

[0041] Set the maximum value σ of the target radar cross-section to be simulated. max Minimum value σ min and mean σ0, where

[0042] The calculation needs to simulate the amplitude value corresponding to the maximum radar cross-section of the target:

[0043]

[0044] Calculate the amplitude value corresponding to the minimum radar cross section of the target to be simulated:

[0045]

[0046] Generate amplitude value U min and U max Uniformly distributed random numbers within a range:

[0047] u = U min +(U max -U min )*rand(1)

[0048] Where rand(1) is a random number that follows a uniform distribution in the range [0,1].

[0049] Generate radar cross section data σ=-σ0×ln(1-u).

[0050] Furthermore, in the normalization and quantization processing module:

[0051] The method for normalizing the radar cross-section data based on the maximum value of the radar cross-section includes:

[0052]

[0053] in, This is the normalized value of the radar cross section data;

[0054] Methods for quantization based on the AD bit count of the radar echo analog system receiver include:

[0055]

[0056] Where, σ * To conform to the radar cross section modulation data of Schwerin type I fluctuation, b is the number of AD bits of the radar echo simulator receiver.

[0057] Furthermore, in the radar echo data generation module, the method for performing radar cross section modulation on the radar sampling signal received by the radar echo simulation system receiver includes:

[0058] y t =σ*×s t

[0059] Among them, y t To conform to the radar echo data of targets exhibiting Schwerin I-type undulations, s t t represents the radar sampling signal received by the radar echo simulation system receiver, and t represents the current sampling time.

[0060] The beneficial effects of this invention are as follows:

[0061] This invention generates RCS data based on the probability distribution corresponding to Schwerin Type I fluctuations. Then, it normalizes the data using the maximum RCS of the simulated target corresponding to the gain of the radar echo simulation system. Data quantization is performed based on the AD bit count. Finally, RCS modulation is applied to the radar sampling signal received by the radar echo simulation system receiver to make the simulated target's radar echo conform to Schwerin Type I fluctuations. Compared to traditional methods using programmable amplifiers and attenuators to simulate targets, this invention offers advantages such as high accuracy and controllable fluctuation characteristics. Attached Figure Description

[0062] Figure 1 This is a flowchart of the radar echo simulation method of the present invention;

[0063] Figure 2 The radar echo RCS test data is obtained using traditional methods;

[0064] Figure 3 The statistical distribution of radar echo RCS test data is obtained using traditional methods;

[0065] Figure 4 The method of this invention is used to obtain radar echo RCS test data;

[0066] Figure 5 This invention provides the statistical distribution of radar echo RCS test data obtained by the method of this invention. Detailed Implementation

[0067] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments are now described. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; that is, the described embodiments are only a part of the embodiments of the invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0068] Example 1

[0069] like Figure 1 As shown, this embodiment provides a radar echo simulation method for Schwerin I type undulating targets, including the following steps:

[0070] S1. Calculate the maximum radar cross section of the simulated target based on the radar echo simulation system gain obtained from the measurement, and generate radar cross section data according to the probability distribution corresponding to Schwerin type I fluctuations.

[0071] S2. The radar cross section data is normalized based on the maximum value of the radar cross section, and then quantized according to the number of AD bits of the radar echo simulation system receiver to obtain radar cross section modulation data that follows Schwerin type I fluctuation.

[0072] S3. Based on the radar cross section modulation data, perform radar cross section modulation on the radar sampling signal received by the radar echo simulation system receiver so that the radar echo of the simulated target conforms to Schwerin type I fluctuation.

[0073] Preferably, in step S1, the method for calculating the maximum radar cross-section that can simulate the target based on the measured radar echo simulation system gain includes:

[0074]

[0075] in, G represents the maximum radar cross-section of the target that the radar echo simulation system can simulate, G is the gain of the radar echo simulation system, and λ is the radar operating wavelength.

[0076] Preferably, in step S1, the method for generating radar cross section data based on the probability distribution corresponding to Schwerin type I fluctuations includes:

[0077] S101. Set the maximum value σ of the radar cross-section of the target to be simulated. max Minimum value σ min and mean σ0, where

[0078] S102. Calculate the amplitude value corresponding to the maximum radar cross-section of the target to be simulated:

[0079]

[0080] Calculate the amplitude value corresponding to the minimum radar cross section of the target to be simulated:

[0081]

[0082] S103. Generate amplitude value U min and U max Uniformly distributed random numbers within a range:

[0083] u = U min +(U max -U min )*rand(1)

[0084] Where rand(1) is a random number that follows a uniform distribution in the range [0,1].

[0085] S104. Generate radar cross section data σ=-σ0×ln(1-u).

[0086] Preferably, in step S2, the method for normalizing the radar cross-section data based on the maximum value of the radar cross-section includes:

[0087]

[0088] in, This is the normalized value of the radar cross section data;

[0089] Methods for quantization based on the AD bit count of the radar echo analog system receiver include:

[0090]

[0091] Where, σ * To conform to the radar cross section modulation data of Schwerin type I fluctuation, b is the number of AD bits of the radar echo simulator receiver.

[0092] Preferably, in step S3, the method for performing radar cross section modulation on the radar sampling signal received by the radar echo simulation system receiver includes:

[0093] y t =σ * ×s t

[0094] Among them, y t To conform to the radar echo data of targets exhibiting Schwerin I-type undulations, s t t represents the radar sampling signal received by the radar echo simulation system receiver, and t represents the current sampling time.

[0095] The effectiveness of the radar echo simulation method in this embodiment is further illustrated by the following experiments:

[0096] 1. Experiment Content

[0097] 1.1) Figure 2 The radar echo RCS test data were obtained using traditional methods;

[0098] 1.2) Figure 3 To obtain the statistical distribution of radar echo RCS test data using traditional methods, the bar chart is shown below. Figure 2 The statistical data of the test data shown is represented by a curve, which is a Gaussian probability density function generated based on the test data.

[0099] 1.3) Figure 4 The radar echo RCS test data obtained using the method proposed in this embodiment;

[0100] 1.4) Figure 5 To obtain the statistical distribution of radar echo RCS test data using the method proposed in this embodiment, the bar chart is shown below. Figure 4 The statistical data of the test data shown is represented by the curve, which is the Schwerin I fluctuation probability density function generated based on the test data.

[0101] 2. Analysis of Experimental Results:

[0102] 2.1) From Figure 2 and Figure 3 It can be seen that the radar echo RCS test data obtained by the traditional method has small fluctuations and its statistical characteristics follow a Gaussian distribution.

[0103] 2.2) From Figure 4 and Figure 5 It can be seen that the radar echo RCS test data obtained by the method proposed in this embodiment fluctuates greatly, and the statistical characteristics follow the Schwerin type I fluctuation characteristics.

[0104] Example 2

[0105] This embodiment provides a radar echo simulation system for Schwerin Type I undulating targets, including:

[0106] The radar cross section data calculation module is configured to calculate the maximum radar cross section of the simulated target based on the measured radar echo simulation system gain, and generate radar cross section data according to the probability distribution corresponding to Schwerin type I fluctuations.

[0107] The normalization and quantization processing module is configured to normalize the radar cross section data based on the maximum value of the radar cross section, and then quantize it according to the number of AD bits of the radar echo simulation system receiver to obtain radar cross section modulation data that follows Schwerin type I fluctuation.

[0108] The radar echo data generation module is configured to perform radar cross section modulation on the radar sampling signal received by the radar echo simulation system receiver based on the radar cross section modulation data, so that the radar echo of the simulated target conforms to the Schwerin type I fluctuation.

[0109] Preferably, in the radar cross section data calculation module, the method for calculating the maximum radar cross section that can simulate the target based on the measured radar echo simulation system gain includes:

[0110]

[0111] in, G represents the maximum radar cross-section of the target that the radar echo simulation system can simulate, G is the gain of the radar echo simulation system, and λ is the radar operating wavelength.

[0112] Preferably, the method for generating radar cross section data based on the probability distribution corresponding to Schwerin type I fluctuations in the radar cross section data calculation module includes:

[0113] Set the maximum value σ of the target radar cross-section to be simulated. max Minimum value σ min and mean σ0, where

[0114] The calculation needs to simulate the amplitude value corresponding to the maximum radar cross-section of the target:

[0115]

[0116] Calculate the amplitude value corresponding to the minimum radar cross section of the target to be simulated:

[0117]

[0118] Generate amplitude value U min and Umax Uniformly distributed random numbers within a range:

[0119] u = U min +(U max -U min )*rand(1)

[0120] Where rand(1) is a random number that follows a uniform distribution in the range [0,1].

[0121] Generate radar cross section data σ=-σ0×ln(1-u).

[0122] Preferably, in the normalization and quantization processing module:

[0123] The method for normalizing the radar cross-section data based on the maximum value of the radar cross-section includes:

[0124]

[0125] in, This is the normalized value of the radar cross section data;

[0126] Methods for quantization based on the AD bit count of the radar echo analog system receiver include:

[0127]

[0128] Where, σ * To conform to the radar cross section modulation data of Schwerin type I fluctuation, b is the number of AD bits of the radar echo simulator receiver.

[0129] Preferably, in the radar echo data generation module, the method for performing radar cross section modulation on the radar sampling signal received by the radar echo simulation system receiver includes:

[0130] y t =σ * ×s t

[0131] Among them, y t To conform to the radar echo data of targets exhibiting Schwerin I-type undulations, s t t represents the radar sampling signal received by the radar echo simulation system receiver, and t represents the current sampling time.

[0132] Example 3

[0133] This embodiment is based on embodiment 1:

[0134] This embodiment provides a computer device, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps of the radar echo simulation method for Schwerin I type undulating targets in Embodiment 1. The computer program can be in the form of source code, object code, executable file, or some intermediate form.

[0135] Example 4

[0136] This embodiment is based on embodiment 1:

[0137] This embodiment provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the radar echo simulation method for Schwerin I type undulating targets described in Embodiment 1. The computer program can be in the form of source code, object code, executable file, or some intermediate form. The storage medium includes any entity or device capable of carrying computer program code, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. It should be noted that the content of the storage medium can be appropriately added to or subtracted according to the requirements of legislation and patent practice in a jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the storage medium does not include electrical carrier signals and telecommunication signals.

[0138] It should be noted that, for the sake of simplicity, the foregoing method embodiments are described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

Claims

1. A method for simulating radar echoes of Schwerin Type I undulating targets, characterized in that, Includes the following steps: S1. Calculate the maximum radar cross section of the simulated target based on the radar echo simulation system gain obtained from the measurement, and generate radar cross section data according to the probability distribution corresponding to Schwerin type I fluctuations; S2. The radar cross section data is normalized based on the maximum value of the radar cross section, and then quantized according to the number of AD bits of the radar echo simulation system receiver to obtain radar cross section modulation data that follows Schwerin type I fluctuation. S3. Based on the radar cross section modulation data, perform radar cross section modulation on the radar sampling signal received by the radar echo simulation system receiver so that the radar echo of the simulated target conforms to Schwerin type I fluctuations. In step S1, the method for calculating the maximum radar cross-section of the simulated target based on the measured radar echo simulation system gain includes: in, To enable the radar echo simulation system to simulate the maximum radar cross section of a target, For radar echo simulation system gain, The operating wavelength of the radar; In step S1, the method for generating radar cross section data based on the probability distribution corresponding to Schwerin type I fluctuations includes: S101. Set the maximum value for the radar cross-section of the target to be simulated. Minimum value and mean ,in ; S102. Calculate the amplitude value corresponding to the maximum radar cross-section of the target to be simulated: Calculate the amplitude value corresponding to the minimum radar cross section of the target to be simulated: S103. Generate amplitude value and Uniformly distributed random numbers within a range: in, A random number that follows a uniform distribution within the range [0,1]. S104. Generate radar cross section data .

2. The radar echo simulation method for Schwerin Type I undulating targets according to claim 1, characterized in that, In step S2, the method for normalizing the radar cross-section data based on the maximum value of the radar cross-section includes: in, This is the normalized value of the radar cross section data; Methods for quantization based on the AD bit count of the radar echo analog system receiver include: in, To conform to the radar cross section modulation data of Schwerin type I fluctuations This represents the AD bit count of the radar echo simulator receiver.

3. The radar echo simulation method for Schwerin Type I undulating targets according to claim 2, characterized in that, In step S3, the method for performing radar cross section modulation on the radar sampling signal received by the radar echo simulation system receiver includes: in, To conform to the radar echo data of targets exhibiting Schwerin I-type undulations, The radar sampled signal received by the receiver of the radar echo simulation system. This represents the current sampling time.

4. A radar echo simulation system for Schwerin Type I undulating targets, characterized in that, include: The radar cross section data calculation module is configured to calculate the maximum radar cross section of the simulated target based on the measured radar echo simulation system gain, and generate radar cross section data according to the probability distribution corresponding to Schwerin type I fluctuations. The normalization and quantization processing module is configured to normalize the radar cross section data based on the maximum value of the radar cross section, and then quantize it according to the number of AD bits of the radar echo simulation system receiver to obtain radar cross section modulation data that follows Schwerin type I fluctuation. The radar echo data generation module is configured to perform radar cross section modulation on the radar sampling signal received by the radar echo simulation system receiver based on the radar cross section modulation data, so that the radar echo of the simulated target conforms to Schwerin type I fluctuation. In the radar cross-section data calculation module, the method for calculating the maximum radar cross-section that can simulate the target based on the measured radar echo simulation system gain includes: in, To enable the radar echo simulation system to simulate the maximum radar cross section of a target, For radar echo simulation system gain, The operating wavelength of the radar; The method for generating radar cross section data based on the probability distribution corresponding to Schwerin Type I fluctuations in the radar cross section data calculation module includes: Set the maximum value for the radar cross-section of the target to be simulated. Minimum value and mean ,in ; The calculation needs to simulate the amplitude value corresponding to the maximum radar cross-section of the target: Calculate the amplitude value corresponding to the minimum radar cross section of the target to be simulated: Generate amplitude value and Uniformly distributed random numbers within a range: in, A random number that follows a uniform distribution within the range [0,1]. Generate radar cross section data .

5. The radar echo simulation system for Schwerin Type I undulating targets according to claim 4, characterized in that, In the normalization and quantization processing module: The method for normalizing the radar cross-section data based on the maximum value of the radar cross-section includes: in, This is the normalized value of the radar cross section data; Methods for quantization based on the AD bit count of the radar echo analog system receiver include: in, To conform to the radar cross section modulation data of Schwerin type I fluctuations This represents the AD bit count of the radar echo simulator receiver.

6. The radar echo simulation system for Schwerin Type I undulating targets according to claim 5, characterized in that, The method for performing radar cross section modulation on the radar sampling signal received by the radar echo simulation system receiver in the radar echo data generation module includes: in, To conform to the radar echo data of targets exhibiting Schwerin I-type undulations, The radar sampled signal received by the receiver of the radar echo simulation system. This represents the current sampling time.

Images