LFMCW体制下基于TDPC-JDL的低空风切变风速估计方法

doi:10.3969/j.issn.1001-506X.2020.07.11

Abstract

Abstract:

The target signal will be submerged in the strong clutter background when the airborne weather radar downlooking detects low-altitude wind-shear. Aiming at the problem that the estimation of the wind velocity is not accurate, a low-altitude wind-shear velocity estimation method is proposed based on two dimensional pulse-to-pulse canceller-joint domain localised (TDPC-JDL) in the linear frequency modulated continuous wave (LFMCW) system. Firstly, the TDPC pre-filter is designed to pre-filter the echo data by using the airborne velocity and radar operating parameters to reduce clutter power. Then, the pre-filtered data is subjected to the space-time two-dimensional filtering by local joint processing, and the accurate estimation of wind speed is realized.

Key words: airborne weather radar, linear frequency modulated continuous wave (LFMCW), two dimensional pulse-to-pulse canceller-joint domain localised (TDPC-JDL), low-altitude wind-shear, wind speed estimation

CLC Number:

TN959.4

Hai LI, Di SONG, Ze HUYAN, Qing FENG, Zibo ZHUANG. Wind speed estimation of low-altitude wind-shear based on TDPC-JDL under LFMCW system[J]. Systems Engineering and Electronics, 2020, 42(7): 1504-1509.

Figures/Tables 9

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References 15

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参数	取值
载机高度/m	600
载机速度/(m/s)	75
雷达工作波长/m	0.05
调频周期/ms	0.143
距离分辨率/m	150
带宽/MHz	1
阵元数/个	16
调频周期数/个	64
主瓣方向/(°)	(90, 0)
杂噪比/dB	40
SNR/dB	5
采样频率/MHz	1

方法	矩阵求逆	空时滤波
EFA方法	3(3M)³K+(3M)²K	3MKL
CMCAP方法	2K(M+K-1)³+MK³+ 3K²(M-1)²+K(M-1)³	(M+K-1)KL
GMB方法	3(5+7)³K+3(5+7)²K	(5+7)KL
本文方法	$ 3{(3 \times 3)^3}\frac{K}{3} + 3{(3 \times 3)^2}K $	$ 3 \times 3 \times \frac{K}{3}L $

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Wind speed estimation of low-altitude wind-shear based on TDPC-JDL under LFMCW system

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