【摘 要】
:
完好的导航信号是导航卫星系统实现精确定位的前提,卫星导航信号的数字畸变将导致伪距测量出现误差,造成定位精度下降,威胁到民航等涉及生命安全的应用领域.针对导航信号的数字畸变,基于相关域的幅度比率检测是最有效的检测手段.然而,目前尚没有人对幅度比率检测法进行定量分析.本文以提高检测性能为目标,在介绍了幅值比率检测技术的基础上,从畸变程度、相关器间隔、相关器数量、相关时间这几个角度对检测性能进行了定量分
【机 构】
:
北京航空航天大学,北京,中国,100191 北京卫星制造厂,北京,中国,100080
论文部分内容阅读
完好的导航信号是导航卫星系统实现精确定位的前提,卫星导航信号的数字畸变将导致伪距测量出现误差,造成定位精度下降,威胁到民航等涉及生命安全的应用领域.针对导航信号的数字畸变,基于相关域的幅度比率检测是最有效的检测手段.然而,目前尚没有人对幅度比率检测法进行定量分析.本文以提高检测性能为目标,在介绍了幅值比率检测技术的基础上,从畸变程度、相关器间隔、相关器数量、相关时间这几个角度对检测性能进行了定量分析研究.通过仿真分析,当信噪比为-4dB、相关间隔为0.5个码片时,一对相关器的检测灵敏度可以达到0.05,可以检测出畸变程度为0.05的异常信号.而在信噪比为-4dB时,增加相关器的数量至4对,可以进一步使检测灵敏度提升至0.02,可以检测出畸变量为0.02的异常信号.结果表明,减小相关间隔并适当增加相关器的数量可以显著提升检测效率.随着导航信号质量监测系统的日益完善,本文的研究成果可为导航信号的数字畸变检测提供可靠的实现方案.
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