基于空時(shí)自適應(yīng)處理的低空風(fēng)切變風(fēng)速估計(jì)方法
doi: 10.11999/JEIT140697 cstr: 32379.14.JEIT140697
基金項(xiàng)目:
國家自然科學(xué)基金(61231017, 61233109)和中央高?；究蒲袠I(yè)務(wù)費(fèi)項(xiàng)目(3122014D007)資助課題
Wind Speed Estimation for Low-attitude Windshear Based on Space-time Adaptive Processing
-
摘要: 針對(duì)機(jī)載氣象雷達(dá)在探測(cè)低空風(fēng)切變時(shí)，有用信號(hào)會(huì)淹沒在強(qiáng)雜波背景中的問題，該文提出一種基于空時(shí)自適應(yīng)處理(STAP)的低空風(fēng)切變風(fēng)速估計(jì)方法。該方法首先利用空時(shí)插值原理校正機(jī)載前視陣地雜波的距離依賴性，獲得多個(gè)獨(dú)立同分布(IID)樣本后估計(jì)地雜波協(xié)方差矩陣，然后構(gòu)造適用于分布式低空風(fēng)切變目標(biāo)的空時(shí)自適應(yīng)處理器，在自適應(yīng)抑制地雜波的同時(shí)積累低空風(fēng)切變信號(hào)，最終實(shí)現(xiàn)風(fēng)場(chǎng)速度的精確估計(jì)。仿真結(jié)果表明，在高雜噪比、低信噪比的情況下，該方法可有效地自適應(yīng)抑制地雜波并精確地估計(jì)風(fēng)場(chǎng)速度。
-
關(guān)鍵詞:
- 機(jī)載氣象雷達(dá) /
- 低空風(fēng)切變 /
- 風(fēng)速估計(jì) /
- 空時(shí)自適應(yīng)處理
Abstract: When detecting low-attitude windshear with airborne weather radar, the real signals are usually covered with strong clutter. In this paper, a novel method of low-attitude windshear speed estimation based on Space-Time Adaptive Processing (STAP) is proposed to solve the above problem. The proposed method handles the range-dependence of clutter of airborne forward looking array with space-time interpretation theory to achieve the Independent and Identically Distributed (IID) samples used in the clutter covariance matrix estimation; then the space-time adaptive processor is constructed which is applicable to a distributed low-attitude windshear target to suppress clutter and accumulate windshear signal; finally the accurate estimation of wind speed is got. The experimental results show that the proposed method can achieve a superior clutter suppression performance and an accurate wind speed estimation in high clutter-to-noise ratio and low signal-to-noise ratio. -
計(jì)量
- 文章訪問數(shù): 2166
- HTML全文瀏覽量: 143
- PDF下載量: 594
- 被引次數(shù): 0
下載:
