窄頻帶脈沖 的英文怎麼說
中文拼音 [zhǎibīndàimàichōng]
窄頻帶脈沖
英文
narrow band pulse-
Miniopterus schreibersii parvipes emits calls with short duration, long interpulse intervocal, narrow fm sweeping and low duty cycle
24khz ,調頻帶較窄,聲脈沖時間較短,聲脈沖間隔時間很長,能率環較低。Female courtship signal of the brown planthopper was made of many continuous regular pulses and male ' s signal was made of similar syllabics and had two types with different time domain characteristics. second male vibrational signal differed from male courtship signal with wide spectrum range and regular syllabics frequency. time domain characteristics of signals in different individuals even the same individual were different
頻域特徵分析知,褐飛虱雌蟲求偶嗚聲信號的頻域特性較穩定,個體內比個體間差異小;雄蟲求偶嗚聲信號s 、 e片段頻譜范圍較寬,但主振頻率比較接近,差異不顯著; m片段頻帶較窄,主振頻率mvf略小於s 、 e片段,變異較小; m片段脈沖重復頻率prf為幻The echolocating calls in the state of fly were compared with those in the state of hang in two kinds of bats, r. yunanensis and h. pratti, and the doppler compensation effect was described. the analyzing result indicated that the frequency in hang was higher that that in fly, the duration and interpulse duration in hang were longer than those in fly, and the fm bandwidth in hang was narrower than that in fly
比較了雲南菊頭蝠和普氏蹄蝠飛行狀態和懸掛狀態下的回聲定位聲波,描述這2種蝙蝠的多普勒補償效應,懸掛狀態聲波頻率顯著高於飛行狀態,聲脈沖時間和間隔時間顯著長于飛行狀態, fm帶寬窄于飛行狀態。This dissertation is mainly concerned about the radiation of the tem - horn arrays which radiate uwb ( ultra wideband ) pulse, it mainly involves three parts : theory, numerical stimulation and experiment. the uwb antenna is a new research field in the world which has many differences from nb ( narrow band ) antenna. the most difference is that the uwb antenna such as tem - horn radiates nanosecond pulse which has wide frequency spectrum, but the nb antenna radiates single frequency signal
超寬帶天線是一項新興的研究領域,它與窄帶天線有很多不同之處,最根本的不同在於:超寬帶天線例如tem喇叭天線是輻射納秒級短脈沖信號,這種脈沖信號有很寬的頻譜;而窄帶天線大都是輻射單一頻率時諧信號的。The above waveforms discussed are to synthesize the wb or uwb with narrow band pulses. assuming the transmitting uwb linear frequency modulation ( chirp ), dechirp processing is introduced, and the method involved to obtain high resolution by reducing the if bandwidth is presented. furthermore, dechirp processing used to sar imaging is discussed, and the processing steps are described
< wp = 4 >以上研究的兩種信號形式都是通過窄帶子脈沖串相參合成的方法來獲得超寬帶回波信號,本文還探討了去斜率( dechirp或stretch )方法,分析了去斜率降低接收機中頻帶寬、 fft獲得目標一維距離像的原理,並探討了線性調頻去斜率合成孔徑雷達成像,給出了具體實現步驟。分享友人