| 摘要 |
<p>PROBLEM TO BE SOLVED: To make improvable the quality of displayed image by calculating a frequency error generated due to measurement error of the speed of a radar device itself using an output data of an FFT operator and shifting the frequency of the output data by a value corresponding to the error. SOLUTION: Processed results of an FFT operator are transferred to a peak frequency detection means 21a and a frequency indicating the peak intensity of the output data is detected. In an antenna beam directional angle memory 23a, the directional azimuth of the antenna beam is contained one by one. With a frequency shift means 22a, a frequency fb corresponding to the central azimuth of the beam forwarded from the antenna beam directional angle memory 23a is calculated. By comparing the frequency fb and the frequency fp forwarded from the peak frequency detection means 21a, processed data are shifted on a frequency axis so that they coincide with each other. In short, the frequency errorΔf is obtained withΔf=fb-fp so that the contained data series can be shifted by the frequency corresponding to|Δf|.</p> |
