Method for improving ranging precision of radar based on Gaussian interpolation

Abstract

The invention relates to a method for improving the ranging precision of a radar based on Gaussian interpolation, and belongs to the technical field of pulse method radar ranging. Based on prior information, on the premise that a sampling rate, a bandwidth and a window function are selected and noise is not added firstly, when a high reference sampling rate is selected to fit an echo pulse pressure result of a 3dB beam width into a Gaussian distribution function, only sampling points with a maximum value and a second maximum value are taken from the echo pulse pressure result, the sampling time is normalized into a sampling time unit by using a real sampling rate, Gaussian interpolation processing can be performed according to a variance value obtained by prior information to estimate a mean value of the fitted Gaussian distribution function, namely the sampling time unit where an echo peak value appears, the echo peak value time can be obtained through simple calculation and conversion, and therefore, the purpose of reducing the distance quantization error is achieved. Simulation results show that the method can significantly improve the ranging precision of a radar.

Description

technical field [0001] The invention belongs to the technical field of radar distance measurement by pulse method, in particular to a Gaussian interpolation method for improving the precision of radar distance measurement, which is used for reducing the distance quantization error during radar distance measurement and improving the radar distance measurement precision. Background technique [0002] The most basic task of the radar is to detect the target and measure the distance of the target, that is, to use the reflection of the electromagnetic wave by the target to find the target and locate the target, and the ranging accuracy is one of the important performance indicators of the radar. [0003] Radio waves propagate in a straight line at a fixed speed in a homogeneous medium (the propagation speed in free space is approximately equal to the speed of light), then the distance from the target to the radar station can be obtained by measuring the time required for the radio...

AI Technical Summary

Problems solved by technology

However, limited by the sampling rate, the radar processing resolution is limited, resulting in inevitable measurement errors and reducing the ranging accuracy

At the same time, considering that the high sampling rate will increase the amount of computation, it is difficult to realize in engineering, and the increase of the sampling rate only reduces the impact of the quantization error, but does not necessarily improve the distance measurement accuracy, so the study reduces the distance quantization error The method is an important content in the study of radar ranging technology

[0005] The traditional parabolic interpolation method requires three sampling points in the main lobe of the pulse pressure result, so that there is a sampling point with a low SNR, which does not match the actual model, resulting in a large error. On the other hand, the calculation of the parabolic interpolation method A large amount will cause a waste of time and resources

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