FPGA operational circuit based on generalized correlation coefficients

Abstract

The invention discloses an FPGA (a field-programmable gate array) operational circuit based on generalized correlation coefficients. The architecture of the FPGA operational circuit comprises an array multiplication accumulator, a shifting register, a multiplying unit, an assembly line, a square root extractor, a divider and a register. When environmental noise contains an impulse noise component, a matched filter basically loses efficacy while the SR (the Spearman rank correlation coefficients) and the KT (the kendall rank correlation coefficient) contained in the generalized correlation coefficients still can show excellent robustness when interfered by impulse noise; by utilizing the rich logical resources and the high-speed parallel processing capability of the FPGA, the operational circuit achieves real-time and high-speed correlation processing of signals based on the SR, the KT and the PPMCC (the product moment correlation coefficient) and can be applied to radar, a sonar sound ranging system and a GNSS (a global navigation satellite system) for signal capturing, tracking and other signal processing technologies.

Description

technical field [0001] The invention utilizes the programmability and fast parallel computing capability of the internal logic circuit of the FPGA to realize a highly dynamic and real-time correlation computing circuit, and is applied to radar, sonar ranging and GNSS signal acquisition and tracking. Background technique [0002] In the field of communication, signal correlation is the core link of signal processing technologies such as radar, sonar ranging and GNSS signal acquisition and tracking. Correlation is a method of detecting known signals in a noisy background, which is widely used in radar and sonar ranging, acquisition and tracking of GNSS signals. At present, the design and realization of the correlator usually adopts the matched filter. The matched filter is an optimal linear filter for additive Gaussian white noise, and the signal-to-noise ratio of its output signal reaches the maximum, which is an optimal linear filter. And the circuit structure of its opera...

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Problems solved by technology

[0010] The purpose of the present invention is to avoid the deficiencies in the prior art and propose a kind of FPGA operation circuit based on generalized correlation coefficient, this operation circuit has realized SR, KT and PPMCC three kinds of correlation coefficients that generalized correlation coefficient includes, wherein, introduce SR As a measurement tool related to signals in the communication field, KT and KT have well solved the problem of performance degradation of matched filters when signals are mixed with impulse noise. Using FPGA's rich logic resources and high-speed parallel processing capabilities, it is possible to realize PPMCC's real-time and fast signal correlation processing can be applied to signal processing technologies such as radar, sonar ranging and GNSS signal acquisition and tracking

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