The scatterometer on HY-2A, which is a spaceborne real aperture Ku band radar with high radiometric resolution and stability, can be used for determination of wind fields at the ocean surface. In this paper, the method of the internal calibration and the external calibration on HY-2A are described and detailed results are provided.

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In view of the shortcomings of pulse radar signals that are easily affected by internal and external conditions, a pulse radar signal calibrator is designed based on FPGA. The radar’s transmitted signals are pulsed by the calibrator in real time, and the radar signals can be calibrated by inversion analysis. At the same time, the functions of timing reception of the status information of each extension and saving of the collected data to the USB mobile hard disk are controlled by the host computer. After testing, the measurement accuracy error caused by the transmission path during the radar system’s working process can be calibrated by this radar signal calibrator, the accuracy of the radar system link is improved, and the accuracy of the radar system measurement is guaranteed. Therefore, it can be widely used in ground calibration equipment of pulse radar.

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