Two-point parabola interpolation method for improving radar ranging precision

Abstract

The invention relates to a two-point parabola interpolation method for improving radar ranging precision, and belongs to the technical field of pulse method radar ranging. The method includes the steps: fitting an echo pulse pressure result of the 3dB beam width into a parabola function y=ax2+bx+c to determine a parameter a by using prior information under the condition that the relationship between the sampling rate and the bandwidth is determined and a window function is selected; then only taking a maximum sampling point and a second maximum sampling point from the echo pulse pressure result, taking the sum of amplitudes of the two sampling points as an estimated peak value, normalizing the amplitudes of the two sampling points by using the estimated peak value, and then performing parabola fitting; according to an abscissa calculation formula corresponding to the maximum value of a parabola function, interpolating and estimating the sampling position where the echo peak value occurs; and finally, considering that an error exists when the echo pulse pressure result is fitted into a parabola function, correcting the parameter a, further improving the accuracy of the estimated peak value position, and reducing the distance quantization error.

Description

technical field [0001] The invention belongs to the technical field of radar ranging by pulse method, in particular to a two-point parabolic interpolation method for improving radar ranging accuracy, which is used for reducing distance quantization error during radar ranging and improving radar ranging accuracy. Background technique [0002] The most basic task of radar is to detect the target and measure the distance of the target, that is to use the reflection of the target to the electromagnetic wave 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 speed of propagation in free space is approximately equal to the speed of light c=3×10 8 m / s), then the distance R from the target to the radar station can be measured by the time t required for one round trip of the radio wave R get, [0004] which is ...

AI Technical Summary

Problems solved by technology

[0008] When the traditional three-point parabola method is used to interpolate the echo pulse pressure results, it is found that the effect is not ideal in some cases, and the error is large. The main reason is that when two of the three sampling points selected If the amplitude difference is too small, the traditional parabolic interpolation algorithm does not match the actual model, which will generate large errors and reduce the accuracy of radar ranging

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