Frequency-modulated continuous wave landing radar ranging method based on gravity center correction

Abstract

The invention discloses a frequency-modulated continuous wave landing radar ranging method based on gravity center correction. The method includes acquiring echo signals of a frequency-modulated continuous wave landing radar; (2) obtaining a two-dimensional matrix of the echo signals after frequency modulation is obtained; (3) obtaining the frequency spectrum of the differential frequency signal;(4) obtaining the first estimated values of the spectral gravity center and the spectral width of the differential frequency signal; (5) calculating the noise power of the frequency spectrum of the differential frequency signal; (6) obtaining second estimated values of the spectral gravity center and the spectral width of the differential frequency signal; (7) acquiring a ground incident angle ofthe frequency-modulated continuous wave landing radar antenna beam; and (8) obtaining a corrected ranging result. The corrected distance estimation value is obtained by adding a gravity center correction coefficient, the method can be applied to the frequency-modulated continuous wave landing radar ranging, and the requirement for distance measurement with higher precision can be met.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and further relates to a frequency-modulated continuous wave FMCW (Frequency Modulated Continuous Wave) landing radar ranging method based on center-of-gravity correction in the technical field of radar data processing. The invention measures the distance between the frequency modulation continuous wave landing radar and the ground by correcting the center of gravity of the echo spectrum after estimating the center of gravity of the frequency modulation continuous wave landing radar echo spectrum by the center of gravity method. Background technique [0002] Frequency modulated continuous wave radar has the advantages of small radiation power, high precision of distance measurement and speed measurement, relatively simple equipment, good electronic countermeasures and low intercept probability, etc. It has been widely used in military and civilian fields such as missile guidance, s...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that it needs to re-do the windowed FFT operation on the difference frequency signal after the frequency shift, and calculate its power spectrum according to the calculation formula of the signal power spectrum, which requires a large amount of calculation, so this method cannot be applied in Landing radar ranging in complex scenes

However, the disadvantage of this method is that the spectrum of the intermediate frequency signal needs to be refined by chirp Z transform, and the ranging accuracy is related to the spectrum thinning multiple. When the spectrum thinning multiple is small, the ranging accuracy is low.

Increasing the spectrum refinement multiple can improve the ranging accuracy but also increase the amount of calculation

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