S频段单脉冲跟踪接收机研究设计

发布时间：2018-03-25 12:49

本文选题：跟踪接收　切入点：单通道　出处：《电子科技大学》2016年硕士论文

【摘要】：作为车载测控站跟踪系统的重要组成部分,单脉冲单通道跟踪接收机接收跟踪下变频输入的调制信号,计算出角度误差,转换为模拟电压送伺服控制单元,完成对目标的跟踪,同时,根据对调制信号的处理,计算出和路信号和差信号的相位差,转换为数字信号送移相器。受限于当今的A/D转换技术,单脉冲单通道跟踪接收机的数字化均在中频进行。相较于过去的模拟接收机,单脉冲跟踪接收机的数字化使电路的复杂性得到了显著的降低,提高了设备可靠性以及跟踪精度,并且对于开发团队而言,数字化使设备成本得到显著的降低。本论文首先对单脉冲自跟踪原理做了详细分析,其中重点说明了单脉冲单通道跟踪接收机的0/π调制,并给出了相应的解调算法。根据任务书要求,在中频70MHz进行信号数字化,然后通过FPGA与DSP芯片的联合,完成相应的信号牵引、锁定、解调功能,最终计算出角误差,再转换为模拟电压送伺服控制单元,完成对目标的跟踪。本论文的主要内容如下:1.详细阐述了单脉冲单通道跟踪接收机的0/π调制原理,并对调制过程进行了详细推导。2.详细说明了设计过程中所需要的数字信号处理技术,其中包括带通采样定理、数字锁相环、快速傅里叶变换。并对有源比例积分滤波器的幅频特性、主要参数的计算方法做了详细的分析。3.详细描述了车载单通道单脉冲跟踪接收机的具体电路实施方案。主要包括设计指标、性能要求、核心芯片选择、信号处理电路设计、监控处理单元设计。其中,最主要的就是对信号处理电路的设计,主要包含中频接收处理单元设计以及信号跟踪处理模块设计。(1)对于中频接收处理单元,论文中主要论述了频率牵引、数字锁相环模块的设计过程。(2)对于信号跟踪处理模块,论文中主要对解调算法做了详细推导,并编程仿真验证了调制解调算法的可行性。4.完成对单脉冲跟踪接收机的实测,最终结果表明所设计的单脉冲单通道跟踪接收机满足任务书要求。
[Abstract]:As an important part of tracking system of vehicle measurement and control station, monopulse monopulse tracking receiver receives modulation signal from tracking down frequency conversion input, calculates angle error, converts it into analog voltage sending servo control unit to complete target tracking. At the same time, according to the modulation signal processing, the phase difference between the harmonic signal and the difference signal is calculated and converted into digital signal phase shifter. The digitization of monopulse single-channel tracking receiver is carried out in intermediate frequency. Compared with the analog receiver in the past, the digitalization of monopulse tracking receiver has greatly reduced the complexity of the circuit, improved the reliability of the equipment and the tracking accuracy. And for the development team, the cost of the equipment is significantly reduced by digitization. Firstly, the principle of monopulse self-tracking is analyzed in detail, in which the 0 / 蟺 modulation of monopulse monopulse tracking receiver is emphasized. The corresponding demodulation algorithm is given. According to the requirements of the task book, the signal is digitized in the intermediate frequency 70MHz, then the corresponding signal traction, locking and demodulation functions are completed through the combination of FPGA and DSP chip. Finally, the angle error is calculated. The main contents of this thesis are as follows: 1. The principle of 0 / 蟺 modulation of monopulse single-channel tracking receiver is described in detail. The digital signal processing technology needed in the design process, including the bandpass sampling theorem, digital phase-locked loop, is explained in detail. Fast Fourier transform. The amplitude-frequency characteristic of active proportional integral filter, The calculation method of main parameters is analyzed in detail. 3. The detailed circuit implementation scheme of single channel monopulse tracking receiver is described in detail, which mainly includes design index, performance requirement, core chip selection, signal processing circuit design, etc. Monitoring and processing unit design. Among them, the most important is the design of signal processing circuit, including if receiving processing unit design and signal tracking processing module design. This paper mainly discusses the design process of frequency traction, digital phase-locked loop (DPLL) module. For the signal tracking and processing module, the paper mainly deduces the demodulation algorithm in detail. The feasibility of the modulation and demodulation algorithm is verified by programming. 4. The actual measurement of the monopulse tracking receiver is completed. The final results show that the monopulse monopulse tracking receiver meets the requirements of the taskbook.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN851

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