Double channels DDC to multi-frequency satellite navigation signals

Direct RF sampling technique is a method to receive navigation signals directly, after that we pass the signals after A/D to the down conversion system, and then get the baseband signals. However, the satellite navigation signal frequency is quite high, the sampling frequency required is also high, and this will bring a series of problems to us, so we should pass the sampled signals through a series of operations such as filtering, mixing and extraction, in order to get the baseband signals which are convenient for us to further processing. In this paper, we present a new digital down conversion (DDC) which has double channels and based on RF sampling.