Calibration method for RDSS channel zero value

A calibration method for RDSS (Radio Determination Satellite Service) channel zero value comprises the following steps: adopting a signal consistent with an RDSS service transmission system to serve as a test signal for calibration; performing two-channel A/D synchronous over-sampling to the input and the output of the navigation satellite RDSS channel; performing interception and Hilbert transformation to sampled input and output signals; carrying out carrier rotation to any one of the input and output signals; performing conjugate multiplication to signals subjected to carrier rotation or not after the signals are subjected to Fourier transformation, and then performing reverse Fourier transformation again; squaring time-domain data amplitudes which is subjected to reverse Fourier transformation, and searching a peak value from the result so as to determine a sample point sequence number value corresponding to the peak value point; and multiplying the sequence number value by a sampling period, and then allowing the result to minus the time delay of a connection cable, an attenuator and a power divider, so as to obtain the RDSS channel zero value. According to the method provided by the invention, the generation of local pseudo-code generator is not required, and the acquisition and tacking for spread spectrum signals are also avoided, so the realization is simple.