单脉冲单通道角跟踪算法研究与实现

发布时间：2018-04-30 23:37

本文选题：单脉冲单通道 + 角跟踪　；参考：《南京理工大学》2017年硕士论文

【摘要】：角跟踪系统是跟踪与数据中继卫星系统的重要组成部分,其可靠的跟踪能力是完成星间测控和数据传输的基础。目前,常用的跟踪方式有步进跟踪、圆锥扫描跟踪和单脉冲跟踪。单脉冲跟踪具有跟踪实时性好、星上设备简单、动态滞后小等优点,是国内外角跟踪系统的常用实现方式。在星间链路中,信号信噪比低、多普勒动态范围大,使得基带信号处理技术成为整个系统关注的重点。本论文首先分析了单脉冲单通道角跟踪系统的基本原理,并进行了公式推导。在此基础上,对角跟踪接收机基带信号处理中所用到的载波捕获与跟踪技术、检波技术和积累技术进行了研究,并通过仿真验证对部分算法进行了评估,结果表明:基于多次FFT联合的快速频率估计方法可以快速、精确地锁定目标频率,三阶锁相环可以无误差地跟踪星间链路信号载波,同步检波在低信噪比条件下具有更好的解调性能。研究了宽带数传信号取部分带宽法的角跟踪方案,并对方案进行仿真,仿真结果验证了此种方案的可行性。对不同调制方式的信号,在不同信噪比条件下,使用不同的解调算法进行了仿真,并分析比较了仿真结果,结果表明:二相调制方式虽然只能跟踪单频信号但是解调性能最好。设计了单脉冲单通道角跟踪接收机的基带硬件电路;设计了基于FPGA的基带信号处理方案,并用VHDL语言实现。搭建了单脉冲单通道角跟踪接收机测试系统,并对设计的基带信号处理方案进行了测试验证,最终的测试结果验证了本文基带信号处理方案的可行性和仿真分析的正确性。
[Abstract]:Angle tracking system is an important part of tracking and data relay satellite system. Its reliable tracking ability is the basis of intersatellite measurement and control and data transmission. At present, the commonly used tracking methods are stepwise tracking, conical scanning tracking and monopulse tracking. Monopulse tracking has the advantages of good real-time tracking, simple onboard equipment, small dynamic lag and so on. It is a common way to realize angle tracking system at home and abroad. In the intersatellite link, the signal to noise ratio is low and the Doppler dynamic range is large, which makes the baseband signal processing technology become the focus of the whole system. In this paper, the basic principle of monopulse monopulse angle tracking system is analyzed, and the formula is deduced. On this basis, the carrier acquisition and tracking technology, detection technology and accumulation technology used in baseband signal processing of diagonal tracking receiver are studied, and some of the algorithms are evaluated by simulation. The results show that the fast frequency estimation method based on multiple FFT combination can quickly and accurately lock the target frequency, and the third order PLL can track the signal carrier of the intersatellite link without error. Synchronous detection has better demodulation performance under low signal-to-noise ratio (SNR). The angle tracking scheme of wideband data transmission signal with partial bandwidth method is studied, and the simulation results show that the scheme is feasible. Different demodulation algorithms are used to simulate the signals with different modulation modes under different SNR conditions. The simulation results show that the two-phase modulation can only track single frequency signals but the demodulation performance is the best. The base-band hardware circuit of monopulse mono-channel angular tracking receiver is designed, and the baseband signal processing scheme based on FPGA is designed and realized by VHDL language. A monopulse mono-channel angular tracking receiver test system is built, and the baseband signal processing scheme is tested and verified. The final test results verify the feasibility of the baseband signal processing scheme and the correctness of the simulation analysis.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN927.2

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