摘要卫星导航技术深刻地影响着人们的生活方式。然而，卫星信号微弱易受干扰，当导航天线受到干扰时，将使后续接收机导航精度变差甚至无法正常工作。空时联合自适应抗干扰技术能有效地抑制多种干扰，对于提高接收机的抗干扰性能具有重要意义。80394

本文针对空时联合抗干扰算法的DSP实现展开研究，主要工作如下：（1）针对单个干扰情况下的GPS接收信号，重点研究了基于LCMV准则的单星单约束空时联合自适应模型，采用基于高斯消元法的矩阵求逆算法在TMS320C6678上实现了权重系数的求解。实验结果表明：在干扰信号方向上的相应频点处，波束方向图形成了一定深度的零陷，对干扰实现了有效的抑制。（2）基于TMS320C6678的多核结构，将单线程执行的算法进一步改进为双核并行，优化算法执行时间。实验结果表明：并行处理后执行时间缩短，算法性能得到了提升。（3）采用MFC设计显控界面软件，实现了对抗干扰处理器中基带数据和权重数据的采集。80394

毕业论文关键词  GPS抗干扰  空时联合自适应  TMS320C6678    MFC

毕业设计说明书外文摘要

Title  DSP implementation and display and control interface design of navigation satellite space-time anti jamming algorithm                                                 

Abstract Satellite navigation technology profoundly affects people's way of life。 However, satellite signal is always weak and susceptible to interference。 When the navigation antenna is disturbed, the accuracy of the GPS receiver will become worse。 Space-time adaptive anti interference technology can effectively suppress many kinds of interference, and it has important significance to improve the anti-jamming performance of the receiver。

In view of the implementation of STAP algorithm on DSP, the main works can be described as follows。 1。 For single interference of GPS receiver signal, the model of the STAP algorithm based on LCMV is discussed。 The experimental result shows that the corresponding frequency point in the direction of the interference signal is null in the beam pattern, effectively suppressing the interference。2。 In order to shorten the execution time of the algorithm, the algorithm executed on single thread is optimized to parallel processing on dual core based on the multi-core architecture of TMS320C6678。The experimental result shows that the performance of the algorithm is improved and the execution time is reduced with parallel processing。3。 The baseband data and the weight data in the counter jamming processor are collected with the display and control interface software, which is designed by MFC。

Keywords  GPS anti jamming  Space-Time Adaptive Processing  TMS320C6678   MFC

目   次

1  引言 1

1。1  研究背景及意义 1

1。2  国内外研究现状 1

1。3  本文主要研究工作 2

2  GPS卫星信号及干扰信号 3

2。1  概述 3

2。2  GPS卫星信号的构成 3

2。3  干扰信号的构成 5

3  空时联合自适应抗干扰算法 6

3。1  GPS自适应调零接收机 6

3。2  空时联合自适应处理原理