Method and system for metering digital demodulation error parameters based on continuous wave combination method

The invention discloses a method and a system for metering digital demodulation error parameters based on a continuous wave combination method. The method can comprises the following steps of generating a continuous wave signal with a carrier frequency being sum or difference of a first frequency and a second frequency, wherein the second frequency is smaller than the first frequency; and inputting the generated continuous wave signal as an equivalent digital modulation signal into an input terminal of a vector signal analyzer (VSA), wherein the carrier frequency of the VSA is set to be the first frequency, a demodulation mode is set to be an M-system phase shift keying (MPSK), the symbol velocity is set to be M times of the second frequency, and M is an positive integer. In the invention, because the error parameters of the equivalent digital modulation signal for calibrating the VSA generated by the method can be precisely set and calculated, two problems that value source tracing and error setting of the d