| Navigation is an indispensability part in modern lives. It plays an important role in national economy and modern science technology . In this paper ,we mainly investigate tacan system modulated by medium frequency , and how to implement down-conversion and digital signal processing algorithm .Finally we use FPGA to implement all the TACAN navigation airborne equipment .we firstly introduce the base format of the TACAN signal and theory of the air-to-ground distance measuring and phase measuring ,and secondly introduce the principle key technology such as medium frequency sampling and CIC digital signal filter .Thirdly we give the implement scheme of the hardware ,and the whole design flow of the software .At last ,we analyse the test of the system capability . |
PDF Full Text Request