Application of DSP processor in complicated navigation signal source

In order to resolve synthesis and combination of low frequency signals in the complicated navigation signal source, the principle of signal synthesis with DSP processor is brought forward. On the base of DSP processor and technique principle of direct digit synthesizer the navigation signal source makes full use of the strong processing capacity and rich hardware resources inside DSP processor to build frame circuits of DDS, and makes use of flexible programmable characteristics of DSP units to realize the synthesis and combination of low frequency signals. In process of signal synthesis, process capacity, programmable advantages of DDS and technique advantage of synthesizing signal with DDS are exerted and the functions such as amplitude modulation, frequency modulation, precise phase and amplitude presetting are realized at the same time. At last the paper provides one picture of real synthesis signal waveform to validate the principle correctness.