High-precision distributed internal calibration method for microwave scatterometer

According to the high-precision distributed internal calibration method for the microwave scatterometer, in the sea surface measurement process of the scatterometer, distributed calibration is inserted at a specific interval (fixed period), internal calibration of a scatterometer system is completed, influences of radar transmitting power and receiver gain changes are eliminated, and the measurement precision of a backscattering coefficient is improved. And meanwhile, a background radiation measurement working mode is designed, so that scatterometer background radiation measurement can be completed. Through distributed calibration, the requirement of a proportional calibration method for high isolation of a receiving and transmitting channel of the scatterometer is avoided, the loss of a microwave front-end receiving branch is greatly reduced, the measurement precision of the scatterometer is effectively improved, and the method is suitable for various types of scatterometer systems of fixed wings, conical sc