BPSK调制器时延校准技术研究

发布时间：2018-11-11 10:29

【摘要】：随着卫星技术的快速发展,距离测量在卫星导航定位、遥感遥测等诸多领域中的作用越来越重要。为了保证测量精度,首先必须找到可以测量发射和接收设备的绝对传输时延的方法,准确测试信号通过这些设备产生的时间延迟。BPSK信号调制模式是导航定位系统中的主要调制方式之一,而BPSK调制器时延测量是整个发射装置时延测量的难点,所以,发射装置时延准确测量的关键问题是如何准确测量调制器时延。本文针对卫星导航定位系统中发射装置用BPSK数字基带调制器的时延测量问题,论述了传输系统中时延的定义,介绍了时延的特性,以及软件解调BPSK数字信号测量系统时延的原理过程。利用通用仪器,集成一套可供测试BPSK调制器绝对传输时延的校准系统。该校准系统的特点是:用数字示波器作为高速数据采集器捕获调制信号波形,并通过正交解调软件、时域相关原理完成调制器在BPSK状态下的插入时延测量。
[Abstract]:With the rapid development of satellite technology, the role of distance measurement in satellite navigation and positioning, remote sensing and other fields is becoming more and more important. In order to ensure the accuracy of the measurement, we must first find a way to measure the absolute transmission delay of the transmitting and receiving equipment. BPSK signal modulation mode is one of the main modulation methods in navigation and positioning system, and the delay measurement of BPSK modulator is the difficulty of the time delay measurement of the whole transmitting device. The key problem of accurate measurement of transmitter delay is how to measure modulator delay accurately. In this paper, the definition of time delay in transmission system is discussed, and the characteristics of time delay are introduced, aiming at the problem of time delay measurement of BPSK digital baseband modulator used in satellite navigation and positioning system. And software demodulation BPSK digital signal measurement system delay principle process. A calibration system for testing the absolute transmission delay of BPSK modulator is integrated with a universal instrument. The characteristic of the system is that the digital oscilloscope is used as the high-speed data collector to capture the modulation signal waveform, and through the quadrature demodulation software, the time-domain correlation principle is used to measure the insertion time delay of the modulator in the BPSK state.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN967.1;TN761

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