Design Of Multi-frequency Satellite Navigation Receiver With The New And Traditional Signals

The constant development of the global satellite navigation system cannot beseparated from the monitoring and the test of the satellite navigation receiver on theground. In particular, the four global satellite navigation systems have developedmutually these years, and come up with many new signals. In order to contrast andmonitor the signals of all frequencies, the design of multi-frequency satellitenavigation receiver with the new and traditional signals becomes hot issue.Meanwhile, the rapid development of the programmable logical device providesconvenience for the design of receivers. The major platform of this topic is FPGA, towhich finishes the design of DDC, tracking loop, navigation message and so on.This thesis introduces a method of DDC design which is based on RF sampling indetail. By studying the decimation technology, polyphase filter technology, all kindsof anti-aliasing filters such as FIR、CIC、HB, this thesis analyzes the advantages anddisadvantages of all kinds of filters, and designs the DDC program based on thepolyphase structure of CIC filter and ISOP filter, to reduce the sampling rate and savethe hardware resources.This thesis mainly introduce the design of tracking channel and the loop controlwhich are compatible with the traditional and new signals, analyzes the differencesand practical significance between the signals of the traditional and new signals,analyzes the design method of channel in the receivers and the working theory of FLL,PLL and DLL. The part of channel implement in FPGA, but the loop controlimplement in DSP in this program. Finally, it introduces detailed design and thedesign plan of each sub module.This thesis also introduces bit synchronization, frame synchronization anddecoding after tracking. According to the differences navigation message format, itintroduces the implementation methods and detailed process of its FPGA design.Finally, it assesses and tests the whole receiver, gets the actual test results. The resultverifies the accuracy of this topic design and tests the tracking effect of the receiver.