The Research Of Baseband Signal Processing Algorithm In Beidou-? Navigation Receiver

With the development of the BeiDou strategy, the application of the BeiDou Navigation satellite system is becoming one of the most important parts of the navigation industry which is supported by the country. Thus, the baseband signal processing algorithm as the key port of the receiver technology is collecting more and more attention from all the aspects.At first of all, we made an overview of the BDS which includes the four parts of the BDS and the BDS service volume and so on. Then, we use a lot of words to introduce the BDS signal structure of IB1, its pseudo random code generator and other signal characteristics which are used in the research.Then, introduce the destinations and effects of the signal acquisition algorithm which is one of the key algorithms in the whole paper. In this part, we disgust serial search, the representation of the traditional time domain acquisition, and the FFT search in frequency domain,the representation of parallel search. Taking care of the latter whose speed is faster than the farmer and other advances in efficiency; we finally choose the latter as the acquisition algorithm and simulate the acquisition algorithm. Because the frequency resolution of the FFT acquisition is too coarse for the tracking loop, we use the FFT acquisition and the carrier phase relation to find the fine frequency. As the signal used to test the algorithm which is collected by real receiver, we use the divided segment which uses a port of the same data with the other to simulate the algorithm.Finally, introduce the whole design of the signal tracking algorithm from the whole to the department which includes the design of carrier tracking and the code tracking loop. As the carrier tracking loop, we firstly introduce the second-order phase-locked loop and the costas loop and the frequency locked loop which can assist the costas phase locked loop. When disgusting the code tracking loop, we adopt the most common delay locked loop. Then, introduce the software design strategy of the whole loop and use the real data test the performance of the whole loop, in which we used the frequency locked loop assisted the Costas phase locking loop and the delay locked loop.