雷达信号环境模拟器的设计与实现

发布时间：2018-01-15 01:38

本文关键词：雷达信号环境模拟器的设计与实现　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：雷达信号环境模拟器模拟了真实的战场雷达环境,产生不同特性的雷达脉冲信号,提供给电子对抗设备趋于真实外场条件的测试环境。雷达信号环境模拟器采用软件和硬件结合的方式,具有灵活性、通用性、兼容性等特点。本文根据雷达信号环境模拟器的设计要求和技术指标,对基于单片DSP和FPGA的多通道相互独立的方案进行了详细设计,主要研究工作为:1.对雷达信号的基本类型进行了分析。包括脉冲调幅信号、线性调频信号和相位编码信号,分析了信号原理以及时域和频域特性;然后对雷达信号环境进行仿真建模,包括RF模型、PRI模型和天线扫描模型等,分析了各个模型的原理和特性。2.对雷达信号环境模拟器的总体方案进行设计。给出了显示控制器配合三块信号产生板加一块通信控制板的模拟器总体设计,可以在本地通过显示控制器设置各通道雷达参数,并将参数发送至通信控制板,由通信控制板控制信号产生板产生多达十二通道的相互独立的雷达脉冲模拟信号;确定了信号产生板的技术体制,采用单片DSP和FPGA芯片生成四通道相互独立的雷达信号。3.对信号产生板的硬件进行了详细设计。硬件采用模块化设计,围绕DSP和FPGA芯片展开,完成了DSP选型及其外围电路设计、FPGA选型及其外围电路设计、DAC模块设计、天线扫描调制模拟设计、系统时钟设计以及分为数字供电部分和模拟供电部分的电源模块设计。4.对信号产生板的软件部分进行了详细设计。软件设计中,DSP完成与通信控制板的数据通信,获得雷达脉冲参数,包括中心频率,脉宽,脉冲重复周期,调频模式,调相编码,子码宽度,天线扫描类型,扫描周期等等,对接收到的参数进行部分计算,判断信号模式,在FPGA发送的外部中断到来时通过外部数据总线将对应通道的下一个脉冲所需要的参数发送至FPGA,FPGA利用波形合成器产生特定的雷达信号波形,将数字信号传送给DAC产生模拟信号。论文首先设计了DSP软件流程,然后重点分析了雷达参数协议、信号模式控制的计算模型以及FPGA中相位计算和幅值转换模块,产生了脉冲调幅信号、线性调频信号、相位编码信号以及脉间频率调制和重频调制等特定形式信号。5.最后对模拟信号进行了仿真分析,验证了雷达信号环境模拟器软硬件设计的正确性;同时进行了实验室测试,对模拟器输出信号的时域和频域进行分析,表明了该模拟器输出信号满足各项设计要求。
[Abstract]:The radar signal environment simulator to simulate the real environment of battlefield radar, radar pulse signals have different characteristics, the test environment provides for electronic warfare equipment to true outfield. The radar signal environment simulator using the software and hardware combination, flexibility, versatility, compatibility and so on. According to the design requirements and technical indicators of radar the signal simulator, the multi-channel single chip DSP based on FPGA and independent of the detailed design scheme, the main research work is as follows: 1. the basic types of radar signal are analyzed. Including the pulse amplitude modulation signal, LFM signal and phase encoding signal, analyzes the principle and characteristics of time and frequency signal; then modeling and Simulation of radar signal environment, including RF model, PRI model and antenna scanning model, analyzes the principle and characteristics of each model. The overall design scheme of 2. radar signal environment simulator is given. The display controller with three block signal board plus a communication control board simulator design, can be locally via the display controller to set the radar parameters of each channel, and the parameters are sent to the communication control board, the communication control board analog signal pulse control signal generation board up to twelve channels of independent radar; to determine the technical system of signal board, radar signal using.3. single chip DSP and FPGA generated four channel independent board of signal hardware design is discussed in detail. The hardware adopts modular design, based on DSP and FPGA chip, completed the selection and DSP the peripheral circuit design, selection of FPGA and peripheral circuit design, DAC module design, simulation design of antenna scan modulation system and divided into digital clock design The software part of the power supply and.4. power supply module design analog supply part of the board of signal design is discussed in detail. The software design, DSP data communications and communication control board, to obtain the parameters of radar pulse, including center frequency, pulse width, pulse repetition period, frequency modulation, phase modulation encoding, subcode width, antenna scanning type of scan cycle and so on, on the part of the received parameters calculation, determine the signal sent by the FPGA model, the external interrupt comes through the external data bus will correspond to channel the next pulse required parameters sent to FPGA, FPGA using waveform synthesizer to generate radar specific signal waveform, the digital signal will be transmitted to the DAC to produce analog signals. Firstly, the design of DSP software, and then analyzed the radar parameters protocol, phase calculation model and FPGA mode control signal and amplitude calculation The value of the conversion module, pulse amplitude modulation signal, LFM signal, phase encoding signal and pulse frequency modulation and frequency modulation signals in the form of specific.5. simulation analysis of the analog signal, verify the correctness of the radar signal environment simulator software and hardware design; at the same time, laboratory tests were performed on the simulator's output time domain and frequency domain analysis, show that the simulator output signal to meet the design requirements.

【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.51

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