S频段数字调频发射机设计与实现

发布时间：2018-01-25 13:20

本文关键词： PCM/FM 发射机 S频段 FPGA　出处：《北方工业大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着航天无线通信技术的不断向前发展,各种先进无线通信技术层出不穷,原先的功能简单、互通性差、通用性差的发射机,越来越不能满足市场对性能更好的产品的需求,本论文提出的S频段数字调频发射机可以广泛应用于航天无线通信领域,它采用PCM/FM数字化调制技术,可以很好地利用计算机进行编程,然后在FPGA上实现,有效地解决了当前航天发射机存在的这些问题。基于FPGA实现的S频段数字调频发射机,系统共有四个部分组成,分别是：上位机界面、稳压电源模块、数字中频模块和射频模块。信号在FPGA内部实现PCM数字信号的全数字化调制,再经DAC器件完成数字信号到模拟信号的转换,最后在射频端经过两级上变频完成S频段射频信号的输出。该发射机的输入信号码速率和输出射频信号频点,均可以通过上位机界面灵活的设置,且设置完成后可以实时存储,掉电不丢失。本论文采用的PCM/FM调制技术,具有精度高、动态范围大和抗干扰等优点,在设计该航天发射机的过程中,充分考虑了发射机的可靠性、稳定性、散热性以及电磁兼容性,最后经过实际测试发现,所研制出的发射机的输入输出各项参数满足设计要求,并且硬件电路简单,使用方便,能够实现数据的高速传输,具有很强的通用性和良好的互通性。
[Abstract]:With the continuous development of space wireless communication technology, a variety of advanced wireless communication technologies emerge in endlessly, the original functions are simple, poor interoperability, poor versatility of transmitters. The S-band digital frequency modulation transmitter proposed in this paper can be widely used in the field of aerospace wireless communication. It adopts PCM/FM digital modulation technology. It can be programmed by computer and implemented on FPGA, which effectively solves the problems existing in the current space transmitter. The S-band digital frequency modulation transmitter based on FPGA is realized. The system is composed of four parts: upper computer interface, voltage stabilized power module, digital if module and RF module. The signal realizes the full digital modulation of PCM digital signal in FPGA. Then the conversion of digital signal to analog signal is completed by DAC device. Finally, the output of S-band radio frequency signal is completed by two stages up-conversion at the RF end. The input signal rate and the frequency point of the output radio frequency signal of the transmitter are obtained. Can be set flexibly through the upper computer interface, and after the setup can be stored in real time, no power loss. This paper uses the PCM/FM modulation technology, with high accuracy. In the process of designing the space transmitter, the reliability, stability, heat dissipation and electromagnetic compatibility of the transmitter are fully considered. The input and output parameters of the developed transmitter meet the design requirements, and the hardware circuit is simple, easy to use, and can achieve high-speed data transmission, with strong versatility and good interoperability.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN832.1

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