It is necessary to convert geodetic coordinates into radar coordinates to obtain the true value of the target in the detection of radar measurement accuracy. First, the conversion method between geodetic coordinate system and radar coordinate system is introduced. Then, the coordinate transformation error is analyzed from the aspects of geodetic result measurement error, radar reference point selection error and radar due north calibration error, and the error simulation results are given by using the actual measurement data of a continuous wave radar. Finally, the azimuth and origin correction method for improving the radar measurement accuracy is proposed. The application of the proposed method to the above continuous wave measurement radar can make the true value of the target more accurate, reduce the influence of coordinate conversion error on radar measurement accuracy obviously, and reflect the radar measurement accuracy more accurately.