本文選題：天氣雷達(dá)　切入點(diǎn)：譜矩估計(jì)　出處：《現(xiàn)代雷達(dá)》2015年12期 　論文類型：期刊論文

【摘要】：針對(duì)多普勒天氣雷達(dá)時(shí)間分辨率和方位分辨率提高后,回波強(qiáng)度和徑向速度精度無法滿足1 d B和1 m/s業(yè)務(wù)要求的問題,采用基于距離過采樣技術(shù)和白化濾波算法的改進(jìn)譜矩估計(jì)方法,使估計(jì)精度大大提高。該方法通過在距離向提高采樣頻率,獲取更多的回波信號(hào)樣本數(shù)量,然后采用白化濾波算法去除回波信號(hào)距離向的相關(guān)性,提高回波信號(hào)的獨(dú)立樣本數(shù);并以白化濾波后的回波信號(hào)為基礎(chǔ),改進(jìn)現(xiàn)有脈沖對(duì)譜矩估計(jì)算法,提高譜矩估計(jì)精度。仿真和雷達(dá)試驗(yàn)結(jié)果表明,在回波信號(hào)信噪比較大時(shí),譜矩估計(jì)改進(jìn)算法比現(xiàn)有脈沖對(duì)算法的估計(jì)精度更高,且可解決多普勒天氣雷達(dá)因時(shí)間分辨率和方位分辨率提高后引起的精度降低問題。
[Abstract]:After the time resolution and azimuth resolution of Doppler weather radar are improved, the echo intensity and radial velocity precision can not meet the requirement of 1 dB and 1 m / s operation. The improved spectral moment estimation method based on distance oversampling and whitening filtering algorithm is used to improve the estimation accuracy greatly. By increasing the sampling frequency in the distance direction, the method can obtain more samples of echo signal. Then the whitening filter algorithm is used to remove the correlation of the echo signal distance direction, to increase the independent sample number of echo signal, and based on the whitening filtered echo signal, to improve the existing pulse moment estimation algorithm. The simulation and radar experiments show that the improved spectral moment estimation algorithm is more accurate than the existing pulse pair algorithm when the signal-to-noise ratio of the echo signal is large. It can also solve the problem of reducing the accuracy of Doppler weather radar caused by the increase of time resolution and azimuth resolution.
【作者單位】： 成都信息工程大學(xué)電子工程學(xué)院;中國(guó)氣象局大氣探測(cè)重點(diǎn)開放實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助課題(41475043,41575022,41405030) 四川省科技廳(2014YJ0093) 成都信息工程大學(xué)引進(jìn)人才(KYTZ201414)資助項(xiàng)目
【分類號(hào)】：TN959.4

【相似文獻(xiàn)】

相關(guān)期刊論文 前5條

1 董德保;翁寧泉;肖黎明;孫剛;;一種風(fēng)廓線雷達(dá)譜矩估計(jì)方法研究[J];現(xiàn)代雷達(dá);2009年09期

2 惠建新;吳蕾;高玉春;周杰;;基于極大似然算法的風(fēng)廓線雷達(dá)譜矩估計(jì)[J];氣象科技;2012年01期

3 盧曉光;吳仁彪;;基于RELAX的氣象雷達(dá)回波參數(shù)化譜矩估計(jì)方法[J];信號(hào)處理;2011年08期

4 楊馨蕊;;UHF風(fēng)廓線雷達(dá)譜矩估計(jì)值降水特征研究[J];今日科苑;2009年18期

5 ;[J];;年期

，

本文編號(hào)：1561021