北斗二代多通道收发模块小型化设计

发布时间：2018-06-01 23:49

本文选题：北斗二代 + 多通道　；参考：《电子科技大学》2014年硕士论文

【摘要】：由我国自主研发和独立运行的北斗卫星系统经过不断的发展和完善,已经逐步应用于日常生活和军事领域中,对其地面站中的收发系统的研究也得到广泛的重视,根据北斗二代系统收发系统的研究现状和发展趋势,本文完成一款基于提供授权服务的B3频段的多通道收发模块小型化设计制作和测试。主要的工作内容为:1.根据北斗二代测试系统的要求,完成多通道收发模块中收发通道电路的设计方案,接收通道要实现对输入的射频信号到中频信号的变换,在有限的模块设计尺寸内采用一次变频结构完成接收的下变频,为了方便对各接收通道的输出信号幅度进行调试,在接收通道中使用AGC电路完成对中频的放大;在发射通道中,通过一次上变频结构实现中频到射频的上变频,使用两级功率分配器实现八个发射输出端口的信号分配。2.模块的上下变频电路需要精确、稳定、频谱纯度高的本振信号,采用锁相环电路作为本振信号源,并且通过CPLD芯片对锁相环进行控制。为了保证各接收通道输出信号的带宽、带外抑制和带内平坦度采用声表面波滤波器并且滤波器的尺寸能够满足模块小型化的设计要求,因为声表面波滤波器的匹配电路对模块接收通道的多个参数都有比较重要的影响,所以调试时需要根据各通道的输出信号对匹配电路做相应调整。接收通道中作为中频放大器的AGC电路的输入匹配电路对放大器的增益有较大影响,需要使用ADS软件对匹配电路进行仿真后再选用合适的器件进行焊接,最后通过添加合适的金属屏蔽罩能够保证各模块电路正常工作。3.通过ADS软件对设计的电路进行仿真验证并确定各电路的指标参数以此完成相应的芯片选型,通过protel99se根据合理的射频电路布局和走线规则完成多层PCB版设计,使用成本较低的FR-4基板完成模块的小型化制作,在现有的测试条件下对焊接并调试完成的模块进行主要指标测试,由测试结果可知设计完成的多通道小型化模块的各项指标均达到设计要求,并根据最后的数据对进一步工作做出展望。
[Abstract]:The Beidou satellite system, which is independently developed and operated independently by our country, has been gradually applied to the daily life and military field through continuous development and improvement. The research on the transceiver system in its earth station has also been widely paid attention to. According to the research status and development trend of Beidou second generation transceiver system, this paper completes the miniaturization design and test of a multi-channel transceiver module based on B3 band which provides authorized services. The main job is 1: 1. According to the requirements of the Beidou second generation test system, the design of the transceiver channel circuit in the multi-channel transceiver module is completed. The receiving channel must realize the conversion of the input RF signal to the intermediate frequency signal. In order to debug the output signal amplitude of each receiving channel, AGC circuit is used to amplify the intermediate frequency in the receiving channel. A single up-conversion structure is used to realize if to RF upconversion, and two stage power divider is used to realize the signal allocation of eight output ports. The up-down conversion circuit of the module needs the local oscillator signal which is accurate, stable and with high spectral purity. The phase-locked loop circuit is used as the local oscillator signal source, and the phase-locked loop is controlled by CPLD chip. In order to ensure the bandwidth of the output signal of each receiving channel, the surface acoustic wave filter is used for out-of-band suppression and in-band flatness, and the size of the filter can meet the design requirements of module miniaturization. Because the matching circuit of saw filter has an important effect on many parameters of the receiving channel of the module, the matching circuit should be adjusted according to the output signal of each channel. The input matching circuit of the AGC circuit used as an intermediate frequency amplifier in the receiving channel has a great influence on the gain of the amplifier. It is necessary to use the ADS software to simulate the matching circuit and then select the appropriate device for welding. Finally, by adding a suitable metal shield, we can ensure the normal operation of each module circuit. 3. The circuit is simulated and verified by ADS software and the parameters of each circuit are determined so as to complete the chip selection. The multilayer PCB version is designed by protel99se according to the reasonable RF circuit layout and circuit routing rules. Using the low-cost FR-4 substrate to complete the miniaturization of the module, under the existing test conditions, the welding and debugging of the module completed by the main indicators test, The test results show that each index of the multi-channel miniaturization module is up to the design requirements, and the future work is prospected according to the final data.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN967.1

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