Complex correlation method is applicable to the Doppler frequency shift measurements

through selects DSP as the hardware platform to meet the actual work of the Doppler frequency shift measurement.According to this complex correlation method and the characteristics of software implementation

the arc tangent

low pass filter and orthogonal converter have been optimized

this reduced so that the consumption of hardware resources is reduced.Through stores the value in advance

the highly effective arc tangent algorithm can omit the arc tangent operation each time.Optimized low pass filter and orthogonal converter further saved the search table （LUT） resources.Through the simulation experiment

unified the data the quality assurance and the control algorithm

the result verify the feasibility of the software implementation.