Improved multichannel correlation processing implementing method based on FPGA

A technology related to processing and implementation methods, applied to radio wave measurement systems, instruments, etc., to achieve the effects of simplifying procedures, improving application value, and improving processing efficiency

Active Publication Date: 2016-11-09
XIAN INSTITUE OF SPACE RADIO TECH
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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" u

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  • Improved multichannel correlation processing implementing method based on FPGA
  • Improved multichannel correlation processing implementing method based on FPGA

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[0029] Such as figure 1 Shown is the working principle diagram of the digital correlator. Multiple AD devices sample multiple IF signals at the same time and then perform digital filtering and IQ orthogonal transformation to achieve digital down-conversion. The result of digital down-conversion is 1bit quantized to complete signal preprocessing and send To complex correlation calculation unit. The complex correlation calculation unit is mainly composed of a multiplier and an integrator. Among them, the multiplier completes the XOR operation, and the integrator completes the discretization of the quantization level in time and the accumulation along the time axis at a high level. Each quadrature signal is subjected to complex correlation processing with other quadrature signals, and the complex correlation processing result is output to the upper computer to obtain the complex correlation value corresponding to any two AD channels.

[0030] Aiming at the shortcomings of the prior ...

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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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Application Information

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IPC IPC(8): G01S7/295G01S7/35G01S7/28
CPCG01S7/2806G01S7/295G01S7/352
Inventor 马筱青陈文新刘洁冀军宋广南孙宝华李彬孙娟刘汝猛
Owner XIAN INSTITUE OF SPACE RADIO TECH
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