An Improved Realization Method of Multi-Pass Correlation Processing Based on FPGA

Abstract

Provided is an improved multichannel correlation processing implementing method based on a FPGA. The method comprises steps of: performing orthogonal transformation and XNOR operation on a signal to be subjected to correlation processing; after XNOR result data is obtained, using binary adders to obtain output data of the binary adders; enabling a counter to perform cyclic counting, using the output data of the adder and data in a RAM block as an input of an accumulator to obtain accumulation result data used as new data in the RAM block; outputting the computation result of the accumulator as a multichannel correlation processing result when a counted number equals integral time. Compared with a prior art, the method, by performing 1-bit additive operation on associated data and grouping binary adders, simplifies the arithmetic logic of the FPGA, decreases the occupancy rate of logic resources in the FPGA, may obviously increase the processing efficiency when multiple input signals are provided, and has a good application value.

Description

technical field [0001] The invention relates to the technical field of space microwave remote sensing, in particular to an improved FPGA-based multi-channel correlation processing implementation method. Background technique [0002] The digital correlator is the most critical component in the microwave radiometer of the ocean salinity detection satellite. It completes the measurement of four Stocks vector parameters, provides input for data inversion, and plays a decisive role in the application of the microwave radiometer. When the microwave radiometer of the ocean salinity detection satellite is working, the main beam of the antenna array of the microwave radiometer is directed to the observed ground or sea surface, and the antenna array receives the radiation flow radiated from the ground or sea surface, which causes the energy change of the signal received by the antenna. The signal received by the antenna is divided into two channels V and H through the orthogonal mode ...

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Problems solved by technology

At present, the research on digital correlators mainly focuses on improving AD sampling rate and FPGA processing rate, etc. The AD sampling rate can reach 360Mhz; "Research on the second-order quantization digital correlator of synthetic aperture microwave radiometer" adopts the method of second-order quantization digital signal, and analyzes and verifies the influence of signal-to-noise ratio; "Synthetic aperture radiometer multi-channel high "Study on the first-order digital complex correlator scheme" uses methods such as undersampling, digital down-conversion, and decimation filtering to reduce the requirements for FPGA processing speed. However, this method has a certain impact on the synthetic aperture pattern and is only applicable to radiometer system indicators. In the case of low requirements, a new multi-channel related processing implementation method that can better solve the contradiction between the occupancy rate of logic resources on the FPGA chip and the number of computing units is needed

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