GNSS接收机长码快速直捕技术研究与实现

针对全球导航卫星系统(Global Navigation Satellite System,GNSS)接收机中的长码快速直捕算法,对基于快速傅里叶变换(Fast Fourier Transform,FFT)的循环相关算法和多段匹配滤波器+FFT算法的原理和架构进行了详细分析,同时将阵列天线技术应用于GNSS接收机上,提高了低信噪比下的长码直捕性能。在同一个硬件平台上,2种算法都得到了很好的工程实现,并对试验数据进行了分析和比较。结果表明2种算法各有优缺点,在较低的信噪比和高动态的环境下均能快速有效地完成长码的直接捕获,对GNSS接收机的快速定位和导航具有一定的现实意义。

Research and Implementation on Long Code Rapid Direct Acquisition Technique of GNSS Receiver

For the long-code rapid direct acquisition algorithm in Global Navigation Satellite System(GNSS),the circular correlation method based on Fast Fourier Transform(FFT) and Multi-bank matched filter + FFT method are mainly studied in terms of principle and framework.Applying array antenna technique in GNSS receiver improves the performance of long code direct acquisition under low SNR.At last,the two methods are well implemented on the same hardware platform in engineering,and the experimental data are analyzed and compared.The results of experiment indicate that each of the two methods has its own advantages and disadvantages,and can rapidly implement long code direct acquisition under low SNR and high dynamics,which is very meaningful to rapid positioning and navigation of GNSS receiver.