ANALYSIS OF THE OPERATION OF A CORRELATION RANGE METER AGAINST NON-GAUSSIAN INTERFERENCE WITH K-DISTRIBUTION
DOI:
https://doi.org/10.18372/2310-5461.71.21085Keywords:
radar system, radio engineering system, measurement, correlation, signal processing, aeronavigation system, radio-electronic systemAbstract
This article analyzes the noise immunity of a correlation radio rangefinder that uses wide-band probing signals with noise-like phase modulation against the background of non-Gaussian interference described by the K-distribution. The relevance of the work is due to the critical need for continuous and high-precision range data for navigation and control systems of manned aircraft and UAVs in harsh operating conditions, in particular under the influence of electronic warfare and intense reflections from the underlying surface. In such situations, interference acquires a pronounced non-Gaussian character, for an adequate statistical description of which the K-distribution is best suited. The paper presents a structural diagram of the radio rangefinder and describes the basic principles of its operation, including algorithms for measuring the delay time and applying the Doppler frequency shift compensation circuit, which is critically necessary to eliminate the blurring of the correlation peak during target movement. The main attention is paid to computer modeling of the system in the presence of noise with K-distribution with different values of the shape parameter. The simulation results prove that correlation processing provides a clear separation of the maxima of the cross-correlation function even against the background of strong background noise.
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