例句與造句

1. Based on mono - pulse radar system and the analysis of terrain echoes , a geometrical model of air to ground ranging is constituted . by using the signals received from the sum and difference channels of terrain follow radar , a group of the expressions for terrain echoes are educed and characteristics of these echoes are obtained . according to the characteristics of the echoes , the theory and method of pass zero detection of difference channel and its applications are discussed in detail
   針對(duì)一維單脈沖雷達(dá)體制，分析了地形目標(biāo)回波特性；建立了地形跟隨雷達(dá)空地測(cè)距的幾何關(guān)系；利用雷達(dá)收發(fā)信號(hào)，導(dǎo)出了地形跟隨雷達(dá)和差接收通道的回波信號(hào)表達(dá)式，進(jìn)行了波形仿真，得到了地形跟隨雷達(dá)的地面散射產(chǎn)生回波在時(shí)域中的特性；根據(jù)和差回波特性，闡述了差信號(hào)過(guò)零點(diǎn)檢測(cè)測(cè)距的原理和方法及工程實(shí)踐中的應(yīng)用，并給出了真實(shí)雷達(dá)對(duì)外輻射試驗(yàn)的結(jié)果，驗(yàn)證了文中的仿真。
2. It's difficult to find pulsed radar system in a sentence. 用pulsed radar system造句挺難的