Multi-channel digital correlator in comprehensive aperture microwave remote sensing radiometer

Abstract

The invention provides a multi-channel digital correlator in a comprehensive aperture microwave remote sensing radiometer. The multi-channel digital correlator is mainly formed by a gated clock generation unit, a delay distribution unit, a plurality of sedentary correlation units and a data aggregation unit which are connected in sequence. The gated clock generation unit enables FIFO full marking signals to be used as the enabled end and controls a high frequency clock Rd_clk which is four times of a low frequency clock Wr_clk on the radiometer to be connected and disconnected so that an interrupted clock can be formed, and the interrupted clock is used as a read clock of the FIFO and a processor clock of the delay distribution unit and the sedentary correlation units. The delay distribution unit conducts delay distribution on received signals of a plurality of channels and then transmits the signals to the sedentary correlation units. Preceding stage correlation units of the sedentary correlation units conduct time sharing and multi-correlation operation on the received signals, and backward stage correlation units of the sedentary correlation units conduct accumulation output on operation results of the preceding stage correlation units corresponding to the backward stage correlation units. The data aggregation unit is used for converting the parallel output correlation results of the sedentary correlation units into serial data flow output results.

Description

technical field [0001] The invention relates to a multi-channel digital correlator in a synthetic aperture microwave remote sensing radiometer, belonging to the technical field of microwave remote sensing. Background technique [0002] The microwave remote sensing radiometer is a method to measure and analyze the microwave characteristics of ground objects in a non-contact manner, so as to obtain the characteristic parameters of the target. Due to the inherent characteristics of the traditional real aperture microwave radiometer, the spatial resolution is limited by the physical aperture of the antenna and the dwell time of the beam, so that the ground resolution of the spaceborne system is generally only on the order of tens to hundreds of kilometers. [0003] Synthetic aperture microwave radiometer is an effective way to improve the spatial resolution of spaceborne passive microwave remote sensors. Its working principle is to perform mutual interferometry at different spa...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of the prior art and solve the problem of excessive resource consumption of traditional multi-channel digital correlators, and propose a multi-channel digital correlator in a synthetic aperture microwave remote sensing radiometer

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