CN107340502A - A kind of incoherent scattering radar analogue echoes method and system based on simulink - Google Patents
A kind of incoherent scattering radar analogue echoes method and system based on simulink Download PDFInfo
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Abstract
Description
技术领域technical field
本发明涉及雷达模拟仿真技术领域，尤其是涉及一种基于simulink的非相干散射雷达回波模拟方法及系统。The invention relates to the technical field of radar simulation, in particular to a Simulink-based incoherent scattering radar echo simulation method and system.
背景技术Background technique
非相干散射雷达(ISR)是探测电离层最强大的地基设备，其探测的是电离层中电子与离子热起伏产生的微弱散射信号，不同于常规雷达探测的飞机，导弹和轮船等固定目标，非相干散射雷达具有探测功能强、参量多、精度高、分辨率好、高度范围覆盖大等众多优点。但该雷达设备体积庞大，运行费用非常昂贵，因而目前世界上主要非相干散射雷达开机运行的时间都不长，每年只有大约两到三个月的时间。由于非相干散射雷达的使用代价高昂，给科研人员研究电离层的雷达回波信号带来了较大困难。Incoherent scattering radar (ISR) is the most powerful ground-based equipment for detecting the ionosphere. It detects the weak scattering signals generated by the thermal fluctuations of electrons and ions in the ionosphere, which is different from fixed targets such as aircraft, missiles and ships detected by conventional radars. , incoherent scattering radar has many advantages such as strong detection function, many parameters, high precision, good resolution, and large height coverage. However, the radar equipment is bulky and the operating costs are very expensive. Therefore, the main incoherent scattering radars in the world do not start up for a long time, only about two to three months a year. Due to the high cost of using incoherent scatter radar, it has brought great difficulties for researchers to study the radar echo signals of the ionosphere.
发明内容Contents of the invention
本发明的目的在于克服上述技术不足，提出一种基于simulink的非相干散射雷达回波模拟方法及系统，解决现有技术中的上述技术问题。The purpose of the present invention is to overcome above-mentioned technical deficiency, propose a kind of incoherent scattering radar echo simulation method and system based on simulink, solve above-mentioned technical problem in the prior art.
为达到上述技术目的，本发明的技术方案提供一种基于simulink的非相干散射雷达回波模拟方法，包括：In order to achieve the above-mentioned technical purpose, the technical scheme of the present invention provides a kind of incoherent scattering radar echo simulation method based on simulink, comprising:
S1、在simulink中构建雷达脉冲发射器、发射机、发射天线、电离层目标、接收天线、接收机模拟前端、接收机数字处理模块、输出模块；S1. Build a radar pulse transmitter, transmitter, transmitting antenna, ionospheric target, receiving antenna, receiver analog front end, receiver digital processing module, and output module in simulink;
S2、在simulink中将雷达脉冲发射器正向连接发射机，将发射机正向连接发射天线，将发射天线正向连接电离层目标，将电离层目标正向连接接收天线，将接收天线正向连接接收机模拟前端，将接收机模拟前端正向连接接收机数字处理模块，将接收机数字处理模块正向连接输出模块；S2. In simulink, connect the radar pulse transmitter to the transmitter in the forward direction, connect the transmitter to the transmitting antenna in the forward direction, connect the transmitting antenna to the ionospheric target in the forward direction, connect the ionospheric target to the receiving antenna in the forward direction, and connect the receiving antenna in the forward direction Connect the receiver analog front end, connect the receiver analog front end to the receiver digital processing module forward, and connect the receiver digital processing module forward to the output module;
S3、雷达脉冲发射器模拟发射雷达脉冲信号，发射机放大雷达脉冲信号的功率，发射天线增益雷达脉冲信号，电离层目标模拟电离层对雷达脉冲信号进行散射形成回波信号，接收天线增益回波信号，接收机模拟前端进行信号滤波，接收机数字处理模块处理信号和生成回波信号的幅相信号、生成回波信号的I/Q信号、生成数字滤波器性能对比结果，输出模块输出接收机数字处理模块生成的数据并将模拟的回波信号导入MATLAB中进行进一步处理。S3. The radar pulse transmitter simulates the transmission of radar pulse signals, the transmitter amplifies the power of the radar pulse signal, the transmitting antenna gains the radar pulse signal, the ionospheric target simulates the ionosphere to scatter the radar pulse signal to form an echo signal, and the receiving antenna gains the echo Signal, the analog front end of the receiver performs signal filtering, the digital processing module of the receiver processes the signal and generates the amplitude and phase signal of the echo signal, generates the I/Q signal of the echo signal, and generates the performance comparison result of the digital filter, and the output module outputs the receiver The data generated by the digital processing module and the simulated echo signal are imported into MATLAB for further processing.
本发明还提供一种基于simulink的非相干散射雷达回波模拟系统，包括：The present invention also provides a Simulink-based incoherent scattering radar echo simulation system, comprising:
构建模块：在simulink中构建雷达脉冲发射器、发射机、发射天线、电离层目标、接收天线、接收机模拟前端、接收机数字处理模块、输出模块；Building blocks: Construct radar pulse transmitter, transmitter, transmitting antenna, ionospheric target, receiving antenna, receiver analog front end, receiver digital processing module, output module in simulink;
连接模块：在simulink中将雷达脉冲发射器正向连接发射机，将发射机正向连接发射天线，将发射天线正向连接电离层目标，将电离层目标正向连接接收天线，将接收天线正向连接接收机模拟前端，将接收机模拟前端正向连接接收机数字处理模块，将接收机数字处理模块正向连接输出模块；Connection module: In simulink, connect the radar pulse transmitter to the transmitter in the forward direction, connect the transmitter to the transmitting antenna in the forward direction, connect the transmitting antenna to the ionospheric target in the forward direction, connect the ionospheric target to the receiving antenna in the forward direction, and connect the receiving antenna in the forward direction. Connect the analog front end of the receiver forward, connect the analog front end of the receiver forward to the digital processing module of the receiver, and connect the digital processing module of the receiver forward to the output module;
模拟模块：雷达脉冲发射器模拟发射雷达脉冲信号，发射机放大雷达脉冲信号的功率，发射天线增益雷达脉冲信号，电离层目标模拟电离层对雷达脉冲信号进行散射形成回波信号，接收天线增益回波信号，接收机模拟前端进行信号滤波，接收机数字处理模块处理信号和生成回波信号的幅相信号、生成回波信号的I/Q信号、生成数字滤波器性能对比结果，输出模块输出接收机数字处理模块生成的数据并将模拟的回波信号导入MATLAB中进行进一步处理。Analog module: The radar pulse transmitter simulates the transmission of radar pulse signals, the transmitter amplifies the power of the radar pulse signal, the transmitting antenna gains the radar pulse signal, the ionospheric target simulates the ionosphere to scatter the radar pulse signal to form an echo signal, and the receiving antenna gains back wave signal, the analog front end of the receiver performs signal filtering, the digital processing module of the receiver processes the signal and generates the amplitude and phase signal of the echo signal, generates the I/Q signal of the echo signal, and generates the performance comparison result of the digital filter, and the output module outputs the receiving signal The data generated by the computer digital processing module and the simulated echo signal are imported into MATLAB for further processing.
与现有技术相比，本发明的有益效果包括：依据软目标雷达方程构建电离层目标，构建雷达脉冲发射器、发射机、发射天线、接收天线、接收机模拟前端、接收机数字处理模块、输出模块，将构建的各个部分连接，实现从发射雷达脉冲信号到输出雷达脉冲信号被电离层散射形成的回波信号这个过程的模拟，帮助科研人员摆脱雷达设备条件的限制，不需要依靠昂贵的雷达设备获取相关雷达回波数据，可以方便的模拟出经电离层散射的雷达回波，对于非相干散射雷达回波研究很有利，且模拟过程中的各种参数改变方便，使用起来灵活、便利。Compared with the prior art, the beneficial effects of the present invention include: constructing ionospheric targets according to the soft target radar equation, constructing radar pulse transmitters, transmitters, transmitting antennas, receiving antennas, receiver analog front ends, receiver digital processing modules, The output module connects the various parts of the construction to realize the simulation of the process from transmitting the radar pulse signal to outputting the echo signal formed by the scattering of the radar pulse signal by the ionosphere, helping researchers get rid of the limitation of radar equipment conditions and do not need to rely on expensive The radar equipment obtains relevant radar echo data, which can easily simulate the radar echo scattered by the ionosphere, which is very beneficial for the research of incoherent scattering radar echo, and various parameters in the simulation process are easy to change, and it is flexible and convenient to use .
附图说明Description of drawings
图1是本发明提供的一种基于simulink的非相干散射雷达回波模拟方法流程图；Fig. 1 is a kind of non-coherent scattering radar echo simulation method flowchart based on simulink provided by the present invention;
图2是本发明提供的一种基于simulink的非相干散射雷达回波模拟系统结构框图；Fig. 2 is a kind of incoherent scattering radar echo simulation system structural block diagram based on simulink provided by the present invention;
图3是构建模块构建的各模块之间的整体结构图。Fig. 3 is a diagram of the overall structure between the modules constructed by the building blocks.
附图中：1、基于simulink的非相干散射雷达回波模拟系统，11、构建模块，12、连接模块，13、模拟模块。In the accompanying drawings: 1. Simulink-based incoherent scattering radar echo simulation system, 11. building blocks, 12. connection modules, 13. simulation modules.
具体实施方式detailed description
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
Simulink是MATLAB中的一种可视化仿真工具，是一种基于MATLAB的框图设计环境，是实现动态系统建模、仿真和分析的一个软件包，被广泛应用于线性系统、非线性系统、数字控制及数字信号处理的建模和仿真中。Simulink可以用连续采样时间、离散采样时间或两种混合的采样时间进行建模，它也支持多速率系统，也就是系统中的不同部分具有不同的采样速率。为了创建动态系统模型，Simulink提供了一个建立模型方块图的图形用户接口，这个创建过程只需单击和拖动鼠标操作就能完成，它提供了一种更快捷、直接明了的方式，而且用户可以立即看到系统的仿真结果。Simulink is a visual simulation tool in MATLAB. It is a block diagram design environment based on MATLAB. It is a software package for dynamic system modeling, simulation and analysis. It is widely used in linear systems, nonlinear systems, digital control and In modeling and simulation of digital signal processing. Simulink can model with continuous sample time, discrete sample time, or a mixture of both. It also supports multirate systems, that is, different parts of the system have different sample rates. In order to create a dynamic system model, Simulink provides a graphical user interface for building a model block diagram. This creation process can be completed by simply clicking and dragging the mouse. It provides a faster, more direct and clear way, and the user The simulation results of the system can be seen immediately.
本发明提供了一种基于simulink的非相干散射雷达回波模拟方法，包括：The invention provides a Simulink-based incoherent scattering radar echo simulation method, comprising:
S1、在simulink中构建雷达脉冲发射器、发射机、发射天线、电离层目标、接收天线、接收机模拟前端、接收机数字处理模块、输出模块；S1. Build a radar pulse transmitter, transmitter, transmitting antenna, ionospheric target, receiving antenna, receiver analog front end, receiver digital processing module, and output module in simulink;
S2、在simulink中将雷达脉冲发射器正向连接发射机，将发射机正向连接发射天线，将发射天线正向连接电离层目标，将电离层目标正向连接接收天线，将接收天线正向连接接收机模拟前端，将接收机模拟前端正向连接接收机数字处理模块，将接收机数字处理模块正向连接输出模块；S2. In simulink, connect the radar pulse transmitter to the transmitter in the forward direction, connect the transmitter to the transmitting antenna in the forward direction, connect the transmitting antenna to the ionospheric target in the forward direction, connect the ionospheric target to the receiving antenna in the forward direction, and connect the receiving antenna in the forward direction Connect the receiver analog front end, connect the receiver analog front end to the receiver digital processing module forward, and connect the receiver digital processing module forward to the output module;
S3、雷达脉冲发射器可以模拟发射不同的雷达脉冲信号，发射机放大雷达脉冲信号的功率，发射天线增益雷达脉冲信号，电离层目标模拟电离层对雷达脉冲信号进行散射形成回波信号，接收天线增益回波信号，接收机模拟前端进行信号滤波，接收机数字处理模块处理信号和生成回波信号的幅相信号、生成回波信号的I/Q信号、生成数字滤波器性能对比结果，输出模块输出接收机数字处理模块生成的数据，并将模拟的回波信号以数据文本的方式存储后导入MATLAB工作空间中进行进一步处理。S3. The radar pulse transmitter can simulate the transmission of different radar pulse signals. The transmitter amplifies the power of the radar pulse signal, and the transmitting antenna gains the radar pulse signal. The ionospheric target simulates the ionosphere to scatter the radar pulse signal to form an echo signal, and the receiving antenna Gain the echo signal, the analog front end of the receiver performs signal filtering, the digital processing module of the receiver processes the signal and generates the amplitude and phase signal of the echo signal, generates the I/Q signal of the echo signal, generates the performance comparison result of the digital filter, and outputs the module The data generated by the digital processing module of the receiver is output, and the simulated echo signal is stored in the form of data text and then imported into the MATLAB workspace for further processing.
本发明所述的基于simulink的非相干散射雷达回波模拟方法，步骤S1中：The non-coherent scattering radar echo simulation method based on simulink of the present invention, in step S1:
采用simulink的脉冲产生模块构建雷达脉冲发射器，采用simulink的RF模块、LCBandpass、TWT amplifier构建发射机，采用simulink的天线增益模块构建发射天线和接收天线，采用simulink的匹配滤波器构建接收机模拟前端。Use Simulink's pulse generation module to build a radar pulse transmitter, use Simulink's RF module, LCBandpass, and TWT amplifier to build a transmitter, use Simulink's antenna gain module to build a transmitting antenna and a receiving antenna, and use Simulink's matched filter to build a receiver analog front end .
本发明所述的基于simulink的非相干散射雷达回波模拟方法，步骤S1中构建发射机的方式为：In the non-coherent scattering radar echo simulation method based on simulink of the present invention, the mode of constructing transmitter in step S1 is:
发射机由线性部分和非线性部分组成，线性部分在前，非线性部分在后；线性部分由两个RF模块及一个LC Bandpass(带通滤波器)串联组成，非线性部分由三个RF模块及一个TWT amplifier(功率放大器)组成，其中两个RF模块并联再和TWT amplifier以及另一个RF模块串联。The transmitter is composed of a linear part and a nonlinear part, the linear part is in front, and the nonlinear part is behind; the linear part is composed of two RF modules and a LC Bandpass (bandpass filter) in series, and the nonlinear part is composed of three RF modules and a TWT amplifier (power amplifier), in which two RF modules are connected in parallel and then connected in series with the TWT amplifier and another RF module.
本发明所述的基于simulink的非相干散射雷达回波模拟方法，步骤S1中：The non-coherent scattering radar echo simulation method based on simulink of the present invention, in step S1:
根据软目标雷达方程构建电离层目标，发射天线发出的雷达脉冲信号依次进行信号时延处理和多普勒频移处理后，将雷达脉冲信号输入电离层目标，模拟出经电离层目标散射的回波信号。The ionospheric target is constructed according to the soft target radar equation. After the radar pulse signal sent by the transmitting antenna is processed by signal time delay and Doppler frequency shift in sequence, the radar pulse signal is input into the ionospheric target, and the echo scattered by the ionospheric target is simulated. wave signal.
本发明所述的基于simulink的非相干散射雷达回波模拟方法，步骤S1中：The non-coherent scattering radar echo simulation method based on simulink of the present invention, in step S1:
不考虑雷达编码方式影响的情况下，构建电离层目标的软目标雷达方程为：其中，Pr表示回波功率，Pt表示雷达发射峰值功率，Ar表示天线有效面积，dR表示距离分辨率，nR表示等离子体向量中的电子密度，R1表示目标电离层等离子体向量与雷达的距离，σ0为非磁化等离子体的雷达散射截面，可以表示为：其中σe表示电子的雷达散射截面，α＝4πD/λ，D表示等离子体德拜长度，λ表示雷达波长，Te/Ti表示电子和离子的温度比。Without considering the influence of radar coding mode, the soft target radar equation for constructing ionospheric targets is: Among them, P r represents the echo power, P t represents the radar emission peak power, Ar represents the effective area of the antenna, dR represents the range resolution, n R represents the electron density in the plasma vector, and R1 represents the target ionospheric plasma vector The distance from the radar, σ 0 is the radar cross section of the non-magnetized plasma, which can be expressed as: Where σ e represents the radar cross section of electrons, α = 4πD/λ, D represents the plasma Debye length, λ represents the radar wavelength, T e /T i represents the temperature ratio of electrons and ions.
本发明所述的基于simulink的非相干散射雷达回波模拟方法，步骤S3中接收机进行信号处理和生成数据的过程为：In the non-coherent scattering radar echo simulation method based on simulink of the present invention, the process that the receiver performs signal processing and generates data in step S3 is:
接收机数字处理模块处理信号和生成回波信号的幅相信号、生成回波信号的I/Q信号、生成数字滤波器性能对比结果，具体的过程为，接收机数字处理模块接收接收机模拟前端发送的信号后，分为三个路径进行信号处理，第一个路径为利用数字滤波器进行滤波处理并生成回波信号的幅相信号，第二个路径为按实部与虚部形式分解接收机模拟前端发送的信号并输出中间数据，中间数据用于输出到屏幕提供状态信息等，第三个路径为利用傅里叶滤波器对时域信号进行傅里叶变化得到频域信号并生成回波信号的I/Q信号，同时，接收机数字处理模块对比第一个路径的数字滤波器滤波结果、第三个路径的傅里叶滤波器滤波结果从而生成数字滤波器性能对比结果。The receiver digital processing module processes the signal and generates the amplitude and phase signals of the echo signal, generates the I/Q signal of the echo signal, and generates the performance comparison result of the digital filter. The specific process is that the receiver digital processing module receives the analog front end of the receiver After sending the signal, it is divided into three paths for signal processing. The first path is to use a digital filter to perform filtering processing and generate the amplitude and phase signals of the echo signal. The second path is to decompose and receive the echo signal in the form of real and imaginary parts. The signal sent by the analog front end of the computer and output intermediate data, the intermediate data is used to output to the screen to provide status information, etc., the third path is to use the Fourier filter to perform Fourier transformation on the time domain signal to obtain the frequency domain signal and generate the feedback At the same time, the digital processing module of the receiver compares the filtering result of the digital filter of the first path and the filtering result of the Fourier filter of the third path to generate a performance comparison result of the digital filter.
本发明所述的基于simulink的非相干散射雷达回波模拟方法，步骤S3中：The non-coherent scattering radar echo simulation method based on simulink of the present invention, in step S3:
输出模块将模拟的回波信号以数据文本的方式存储后导入MATLAB工作空间中进行进一步处理，进一步处理包括画出回波信号的频谱图或者对回波信号进行各种分析等。The output module stores the simulated echo signal in the form of data text and then imports it into the MATLAB workspace for further processing. Further processing includes drawing the frequency spectrum of the echo signal or performing various analyzes on the echo signal.
本发明所述的基于simulink的非相干散射雷达回波模拟方法，步骤S3中：The non-coherent scattering radar echo simulation method based on simulink of the present invention, in step S3:
接收机数字处理模块生成的回波信号的幅相信号、回波信号的I/Q信号用于评价模拟的回波质量，评价回波质量的方法为：观察幅相信号、I/Q信号的波形质量以及包络是否清晰，杂波和噪声的影响大不大，是否能看到明显的回波信号；接收机数字处理模块生成的数字滤波器性能对比结果用于评估选用的滤波器性能。The amplitude and phase signals of the echo signal and the I/Q signal of the echo signal generated by the digital processing module of the receiver are used to evaluate the simulated echo quality. Whether the waveform quality and envelope are clear, whether the influence of clutter and noise is significant, and whether an obvious echo signal can be seen; the digital filter performance comparison results generated by the receiver digital processing module are used to evaluate the selected filter performance.
本发明还提供一种基于simulink的非相干散射雷达回波模拟系统1，包括：The present invention also provides a Simulink-based incoherent scattering radar echo simulation system 1, comprising:
构建模块11：在simulink中构建雷达脉冲发射器、发射机、发射天线、电离层目标、接收天线、接收机模拟前端、接收机数字处理模块、输出模块；Building block 11: Construct radar pulse transmitter, transmitter, transmitting antenna, ionospheric target, receiving antenna, receiver analog front end, receiver digital processing module, output module in simulink;
连接模块12：在simulink中将雷达脉冲发射器正向连接发射机，将发射机正向连接发射天线，将发射天线正向连接电离层目标，将电离层目标正向连接接收天线，将接收天线正向连接接收机模拟前端，将接收机模拟前端正向连接接收机数字处理模块，将接收机数字处理模块正向连接输出模块；Connection module 12: In simulink, connect the radar pulse transmitter to the transmitter in the forward direction, connect the transmitter to the transmitting antenna in the forward direction, connect the transmitting antenna to the ionospheric target in the forward direction, connect the ionospheric target to the receiving antenna in the forward direction, and connect the receiving antenna to the Connect the receiver analog front end forwardly, connect the receiver analog front end forwardly to the receiver digital processing module, and connect the receiver digital processing module forwardly to the output module;
模拟模块13：雷达脉冲发射器模拟发射雷达脉冲信号，发射机放大雷达脉冲信号的功率，发射天线增益雷达脉冲信号，电离层目标模拟电离层对雷达脉冲信号进行散射形成回波信号，接收天线增益回波信号，接收机模拟前端进行信号滤波，接收机数字处理模块处理信号和生成回波信号的幅相信号、生成回波信号的I/Q信号、生成数字滤波器性能对比结果，输出模块输出接收机数字处理模块生成的数据并将模拟的回波信号导入MATLAB中进行进一步处理。Simulation module 13: The radar pulse transmitter simulates the transmission of radar pulse signals, the transmitter amplifies the power of the radar pulse signal, the transmitting antenna gains the radar pulse signal, the ionospheric target simulates the ionosphere to scatter the radar pulse signal to form an echo signal, and the receiving antenna gain The echo signal, the receiver analog front end performs signal filtering, the receiver digital processing module processes the signal and generates the amplitude and phase signal of the echo signal, generates the I/Q signal of the echo signal, generates the performance comparison result of the digital filter, and outputs the output module The data generated by the receiver digital processing module imports the simulated echo signal into MATLAB for further processing.
本发明所述的基于simulink的非相干散射雷达回波模拟系统1，构建模块11中：In the incoherent scattering radar echo simulation system 1 based on simulink of the present invention, in the building block 11:
采用simulink的脉冲产生模块构建雷达脉冲发射器，采用simulink的RF模块、LCBandpass、TWT amplifier构建发射机，采用simulink的天线增益模块构建发射天线和接收天线，采用simulink的匹配滤波器构建接收机模拟前端。Use Simulink's pulse generation module to build a radar pulse transmitter, use Simulink's RF module, LCBandpass, and TWT amplifier to build a transmitter, use Simulink's antenna gain module to build a transmitting antenna and a receiving antenna, and use Simulink's matched filter to build a receiver analog front end .
本发明所述的基于simulink的非相干散射雷达回波模拟系统1，构建模块11中：In the incoherent scattering radar echo simulation system 1 based on simulink of the present invention, in the building block 11:
根据软目标雷达方程构建电离层目标，发射天线发出的雷达脉冲信号依次进行信号时延处理和多普勒频移处理后，将雷达脉冲信号输入电离层目标，模拟出经电离层目标散射的回波信号。The ionospheric target is constructed according to the soft target radar equation. After the radar pulse signal sent by the transmitting antenna is processed by signal time delay and Doppler frequency shift in sequence, the radar pulse signal is input into the ionospheric target, and the echo scattered by the ionospheric target is simulated. wave signal.
本发明所述的基于simulink的非相干散射雷达回波模拟系统1，构建模块11中：In the incoherent scattering radar echo simulation system 1 based on simulink of the present invention, in the building block 11:
构建电离层目标的软目标雷达方程为：其中，Pr表示回波功率，Pt表示雷达发射峰值功率，Ar表示天线有效面积，dR表示距离分辨率，nR表示等离子体向量中的电子密度，R1表示目标电离层等离子体向量与雷达的距离，σ0为非磁化等离子体的雷达散射截面，可以表示为：其中σe表示电子的雷达散射截面，α＝4πD/λ，D表示等离子体德拜长度，λ表示雷达波长，Te/Ti表示电子和离子的温度比。The soft target radar equation for constructing ionospheric targets is: Among them, P r represents the echo power, P t represents the radar emission peak power, Ar represents the effective area of the antenna, dR represents the range resolution, n R represents the electron density in the plasma vector, and R1 represents the target ionospheric plasma vector The distance from the radar, σ 0 is the radar cross section of the non-magnetized plasma, which can be expressed as: Where σ e represents the radar cross section of electrons, α = 4πD/λ, D represents the plasma Debye length, λ represents the radar wavelength, T e /T i represents the temperature ratio of electrons and ions.
本发明所述的基于simulink的非相干散射雷达回波模拟系统1，模拟模块13中：In the incoherent scattering radar echo simulation system 1 based on simulink of the present invention, in the simulation module 13:
接收机数字处理模块生成的回波信号的幅相信号、回波信号的I/Q信号用于评价模拟的回波质量，接收机数字处理模块生成的数字滤波器性能对比结果用于评估选用的滤波器性能。The amplitude and phase signals of the echo signal and the I/Q signal of the echo signal generated by the receiver digital processing module are used to evaluate the simulated echo quality, and the performance comparison results of the digital filter generated by the receiver digital processing module are used to evaluate the selected filter performance.
与现有技术相比，本发明的有益效果包括：依据软目标雷达方程构建电离层目标，构建雷达脉冲发射器、发射机、发射天线、接收天线、接收机模拟前端、接收机数字处理模块、输出模块，将构建的各个部分连接，实现从发射雷达脉冲信号到输出雷达脉冲信号被电离层散射形成的回波信号这个过程的模拟，帮助科研人员摆脱雷达设备条件的限制，不需要依靠昂贵的雷达设备获取相关雷达回波数据，可以方便的模拟出经电离层散射的雷达回波，对于非相干散射雷达回波研究很有利，且模拟过程中的各种参数改变方便，使用起来灵活、便利。Compared with the prior art, the beneficial effects of the present invention include: constructing ionospheric targets according to the soft target radar equation, constructing radar pulse transmitters, transmitters, transmitting antennas, receiving antennas, receiver analog front ends, receiver digital processing modules, The output module connects the various parts of the construction to realize the simulation of the process from transmitting the radar pulse signal to outputting the echo signal formed by the scattering of the radar pulse signal by the ionosphere, helping researchers get rid of the limitation of radar equipment conditions and do not need to rely on expensive The radar equipment obtains relevant radar echo data, which can easily simulate the radar echo scattered by the ionosphere, which is very beneficial for the research of incoherent scattering radar echo, and various parameters in the simulation process are easy to change, and it is flexible and convenient to use .
以上所述本发明的具体实施方式，并不构成对本发明保护范围的限定。任何根据本发明的技术构思所做出的各种其他相应的改变与变形，均应包含在本发明权利要求的保护范围内。The specific embodiments of the present invention described above do not constitute a limitation to the protection scope of the present invention. Any other corresponding changes and modifications made according to the technical concept of the present invention shall be included in the protection scope of the claims of the present invention.
Claims (10)
- A kind of 1. incoherent scattering radar analogue echoes method based on simulink, it is characterised in that including step：S1, build in simulink radar pulse transmitter, emitter, transmitting antenna, ionosphere target, reception antenna, connect Receipts machine AFE(analog front end), digital receiver processing module, output module；S2, radar pulse transmitter forward direction is connected into the emitter in simulink, the emitter is positive even The transmitting antenna is connect, the positive connection ionosphere target of the transmitting antenna connects ionosphere target forward direction The reception antenna, reception antenna forward direction is connected into the receiver AFE(analog front end), by the receiver AFE(analog front end) just To the digital receiver processing module is connected, by the positive connection output module of the digital receiver processing module；S3, the radar pulse transmitter analog transmissions radar pulse signal, the work(of the emitter amplification radar pulse signal Rate, the transmitter antenna gain (dBi) radar pulse signal, the ionosphere target simulation ionosphere dissipate to radar pulse signal Penetrate to form echo-signal, the receiving antenna gain echo-signal, the receiver AFE(analog front end) carries out signal filtering, described to connect The width phase signals of receipts machine digital signal processing module process signal and generation echo-signal, the i/q signal for generating echo-signal, generation number Word performance of filter comparing result, the data of the output module output receiver digital signal processing module generation and returning simulation Ripple signal is imported in MATLAB and is further processed.
- 2. the incoherent scattering radar analogue echoes method based on simulink as claimed in claim 1, it is characterised in that step In rapid S1：Using radar pulse transmitter described in simulink pulses generation module construction, using simulink RF modules, LC Bandpass, TWT amplifier build the emitter, launch day using described in simulink antenna gain module construction Line and reception antenna, the receiver AFE(analog front end) is built using simulink matched filter.
- 3. the incoherent scattering radar analogue echoes method based on simulink as claimed in claim 1, it is characterised in that step In rapid S1：The ionosphere target is built according to soft object radar equation, the radar pulse signal that the transmitting antenna is sent enters successively After the processing of row signal time delay and Doppler frequency shift processing, radar pulse signal is inputted into the ionosphere target, simulated through electricity The echo-signal of absciss layer target scattering.
- 4. the incoherent scattering radar analogue echoes method based on simulink as claimed in claim 3, it is characterised in that step In rapid S1：Structure ionosphere target soft object radar equation be：Wherein, PrRepresent echo power, PtRepresent Radar emission peak power, ArAntenna effective area is represented, dR represents range resolution ratio, nRRepresent the electricity in plasma vector Sub- density, R1Represent target ionospheric plasma vector and the distance of radar, σ0Cut for the radar scattering of unmagnetized plasma Face, it can be expressed as：Wherein σeRepresent the RCS of electronics, α=4 π D/ λ, D Plasma Debye length is represented, λ represents radar wavelength, Te/TiRepresent the temperature ratio of electronics and ion.
- 5. the incoherent scattering radar analogue echoes method based on simulink as claimed in claim 1, it is characterised in that step In rapid S3：The width phase signals of echo-signal of the digital receiver processing module generation, the i/q signal of echo-signal are used to evaluate The echo quality of simulation, the digital filter performance comparison result of the digital receiver processing module generation, which is used to assess, to be selected Performance of filter.
- A kind of 6. incoherent scattering radar analogue echoes system based on simulink, it is characterised in that including：Build module：The radar pulse transmitter, emitter, the transmitting antenna, described is built in simulink Ionosphere target, the reception antenna, the receiver AFE(analog front end), the digital receiver processing module, output module；Link block：Radar pulse transmitter forward direction is connected into the emitter in simulink, by the emitter Forward direction connects the transmitting antenna, transmitting antenna forward direction is connected into the ionosphere target, by the ionosphere target just To the reception antenna is connected, the positive connection receiver AFE(analog front end) of the reception antenna simulates the receiver Front end is positive to connect the digital receiver processing module, by the positive connection output mould of the digital receiver processing module Block；Analog module：The radar pulse transmitter analog transmissions radar pulse signal, the emitter amplification radar pulse letter Number power, the transmitter antenna gain (dBi) radar pulse signal, the ionosphere target simulation ionosphere is to radar pulse signal It is scattered to form echo-signal, the receiving antenna gain echo-signal, the receiver AFE(analog front end) carries out signal filtering, The digital receiver processing module process signal and generation echo-signal width phase signals, generate echo-signal i/q signal, Generate digital filter performance comparison result, data of output module output receiver digital signal processing module generation and by mould The echo-signal of plan is imported in MATLAB and is further processed.
- 7. the incoherent scattering radar analogue echoes system based on simulink as claimed in claim 6, it is characterised in that structure Model in block：Using radar pulse transmitter described in simulink pulses generation module construction, using simulink RF modules, LC Bandpass, TWT amplifier build the emitter, launch day using described in simulink antenna gain module construction Line and reception antenna, the receiver AFE(analog front end) is built using simulink matched filter.
- 8. the incoherent scattering radar analogue echoes system based on simulink as claimed in claim 6, it is characterised in that structure Model in block：The ionosphere target is built according to soft object radar equation, the radar pulse signal that the transmitting antenna is sent enters successively After the processing of row signal time delay and Doppler frequency shift processing, radar pulse signal is inputted into the ionosphere target, simulated through electricity The echo-signal of absciss layer target scattering.
- 9. the incoherent scattering radar analogue echoes system based on simulink as claimed in claim 8, it is characterised in that structure Model in block：The soft object radar equation for building the ionosphere target is：Wherein, PrRepresent echo power, Pt Represent radar emission peak power, ArAntenna effective area is represented, dR represents range resolution ratio, nRRepresent in plasma vector Electron density, R1Represent target ionospheric plasma vector and the distance of radar, σ0Dissipated for the radar of unmagnetized plasma Section is penetrated, can be expressed as：Wherein σeRepresent the RCS of electronics, the π of α=4 D/ λ, D represent plasma Debye length, and λ represents radar wavelength, Te/TiRepresent the temperature ratio of electronics and ion.
- 10. the incoherent scattering radar analogue echoes system based on simulink as claimed in claim 6, it is characterised in that In analog module：The width phase signals of echo-signal of the digital receiver processing module generation, the i/q signal of echo-signal are used to evaluate The echo quality of simulation, the digital filter performance comparison result of the digital receiver processing module generation, which is used to assess, to be selected Performance of filter.
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Application publication date: 20171110 |