基于双通道时频差的定位技术研究

发布时间：2018-10-09 17:58

【摘要】：高精度的时差频差定位方法是卫星定位研究领域的关键技术,随着国内卫星导航与定位应用技术的迅速发展,它在民用和军事领域中受到了越来越广泛的应用。因此,对高精度的时差频差定位方法的研究具有重要的理论意义和应用价值。本文在双星定位的研究背景下,深入研究了基于双通道的频差测量方法和基于频差时差的联合定位的技术。论文主要内容如下： 1在单通道多普勒测频的基础上研究了一种新的高精度多普勒频差测量方法。该方法通过两通道数据相关和接收信号的包络斜率测量分别获得了多普勒频率的基带频差和模糊数差。并根据基频差和模糊数差获得基于双通道的高精度多普勒频差测量结果。 2利用基于双通道的高精度多普勒频差测量方法对常见的单频信号、线性调频信号、二相编码信号、四相编码信号进行仿真测试和分析,验证了该方法的有效性。并针对信号抖动、不同信噪比和所需脉冲数等条件进行了算法适用性仿真。 3分别介绍了时差定位原理、频差定位原理和空间坐标系转换公式,为时差频差联合定位方法的研究提供理论基础。 4详细介绍了时差频差定位原理,并在获得精确的频差和时差参数的基础上研究了双星时差频差联合定位方法。该方法是用频差定位来弥补时差定位的缺陷,从而有效地提高了时差定位的定位精度。
[Abstract]:With the rapid development of the domestic satellite navigation and positioning technology, the high-precision time-difference frequency difference positioning method is the key technology in the field of satellite positioning. With the rapid development of the domestic satellite navigation and positioning technology, it has been more and more widely used in civil and military fields. Therefore, the research of high precision time difference frequency difference location method has important theoretical significance and application value. In this paper, under the background of dual satellite positioning, the frequency difference measurement method based on two channels and the joint location technology based on frequency difference time difference are deeply studied. The main contents of this paper are as follows: 1 based on the single channel Doppler frequency measurement, a new high precision Doppler frequency difference measurement method is studied. The base-band frequency difference and the ambiguity number difference of the Doppler frequency are obtained by measuring the envelope slope of the two-channel data correlation and the received signal, respectively. According to the fundamental frequency difference and the ambiguity number difference, the high precision Doppler frequency difference measurement results based on two channels are obtained. 2 the high precision Doppler frequency difference measurement method based on two channels is used to simulate and analyze the common single frequency signal, linear frequency modulation signal, two phase coded signal and four phase coded signal, and the validity of the method is verified. The applicability of the algorithm is simulated for signal jitter, different signal-to-noise ratio (SNR) and pulse number. (3) the principle of time-difference location, the principle of frequency-difference positioning and the transformation formula of spatial coordinate system are introduced respectively, and the theoretical basis is provided for the study of the joint location method of time-difference frequency difference. 4. The principle of TDOA location is introduced in detail, and on the basis of obtaining accurate frequency difference and time difference parameters, the combined TDOA positioning method is studied. In this method, frequency difference positioning is used to make up for the defect of time difference location, and the precision of time difference location is improved effectively.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P228.4

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