例句與造句

1. In this paper , we analyze the reason that it is difficult to process the doppler frequency shift signal generated by low velocity moving target and discuss the kalmus filter performances for low velocity moving target detection
   本文分析了低速目標(biāo)的多普勒頻移信號難以處理的原因，并討論了kalmus濾波器（零速率波器）對低速運(yùn)動目標(biāo)的檢測性能。
2. Firstly , according to the characteristic that the doppler frequency shift signal can be approximated as a single sinusoid signal , the extended sinusoid signal retrieval ( pisarenko and esprit ) methods are presented and signal state and measurement formulations are developed , so the kalman filter recursive method is got . the brief introduction of low velocity moving target doppler frequency shift signal wigner - ville transformation and wavelet transformation expression are presented in this paper . secondly , because the clutter is gaussian distribution , cumement and high - order spectrum based methods are presented and the simulation results prove their good performance to suppress gaussian clutter in low velocity moving target doppler frequency shift signal processing
   一個方面是根據(jù)低速目標(biāo)的多普勒信號可簡化為單一正弦波形式這一特點(diǎn)，得到了擴(kuò)展的高斯色噪聲背景下的諧波恢復(fù)算法，即高斯色噪聲中的pisarenko諧波恢復(fù)法和旋轉(zhuǎn)因子不變法（ esprit ） ；并推導(dǎo)了信號的狀態(tài)方程和觀測方程，進(jìn)而得到基于卡爾曼濾波的遞推算法對信號進(jìn)行提取；本文還簡單的介紹了低速運(yùn)動目標(biāo)的多普勒頻移信號的wigner - ville變換與小波變換；另一個方面是針對雜波服從高斯分布這一特點(diǎn)，提出了對接收信號求累積量和高階譜來對高斯雜波進(jìn)行抑制。
3. It's difficult to find frequency shift signalling in a sentence. 用frequency shift signalling造句挺難的