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为了提高导航卫星反射信号信噪比,提出了一种基于块平均预处理(BAP)的反射信号处理方法,该方法首先以伪码周期为块尺寸对接收信号进行分块,并对各分块进行叠加、平均,然后对平均后的信号进行相关处理.在此基础上,理论分析了块平均预处理对导航反射信号的影响,推导了镜面反射点反射信号处理增益的数学表达式,以及相关处理后得到的一维相关功率,对比分析了该方法与传统处理方法的计算复杂度,分析表明该方法对反射信号具有空域滤波效果,提高了镜面反射点反射信号的信噪比且有效降低了计算复杂度.最后,基于块平均预处理的软件接收机被开发,并对课题组实采的岸基GPS数据进行了处理,结果表明:与未块平均预处理的传统方法相比,在块平均预处理时间为2、5、10、15以及20 ms时,该方法所得相关功率的峰值信噪比分别提高了约3.5、6.7、10.2、10.6和10.4 d B,且在块平均预处理时间为10 ms时,处理等长数据的时间缩短了近2.2倍.
In order to improve the signal-to-noise ratio of navigation satellite reflected signal, a block-averaged preprocessing (BAP) -based reflection signal processing method is proposed. Firstly, the received signal is divided into blocks according to the PN code period, And then the average signal is processed.On this basis, the influence of block average preprocessing on navigation reflected signal is analyzed theoretically, and the mathematical expression of the processing gain of specular reflection point reflection signal is derived, and the correlation The correlation power obtained after processing is compared with the computational complexity of this method and the traditional processing method. The analysis shows that this method has the spatial filtering effect on the reflected signal, improves the signal-to-noise ratio of the specular reflection signal and effectively reduces Calculation complexity.Finally, a software receiver based on block average preprocessing was developed and the bank-based GPS data of the group was processed.The results show that compared with the traditional method of non-block average preprocessing, When the average pretreatment time is 2, 5, 10, 15 and 20 ms, the peak signal-to-noise ratio of the correlation power obtained by this method is increased by about 3.5, 6.7, 10.2, d B, and the average processing time of block is 10 ms, the processing time of isobaric data is reduced by nearly 2.2 times.