But, in the natural and artificial signal, a lot of signal phases don\'tvary linearly with time, for example, we usually use chirp signal in the radar technology,frequency step signal, linear modulation component of the ground echo in the SARtechnology, linear modulation component of the moving target echo, linear modulationcomponent while the airborn radar detecting the moving target, etc.

在自然界和人工信號中亚洲五月综合，許多信號的相位變化并不是隨時間一次方變化，如雷達(dá)技術(shù)中常用的線性調(diào)頻信號美女被插阴道的视频，頻率步進(jìn)信號欧美黑粗大视频，另外，SAR 技術(shù)中欧洲在线人成线视频，地面回波所含有的線性調(diào)頻分量，ISAR技術(shù)中久久香蕉国产线看观看8黑人，運動目標(biāo)的回波所含有的線性調(diào)頻分量色黄乱婬伦免费网站，機(jī)載雷達(dá)探測運動目標(biāo)時的線性調(diào)頻分量，等等日韩午夜无码视频网址大全；傅里葉變換對此類信號分析所得的結(jié)果是信號在不同頻率點上的能量分布日本网站在线视频大全观看免费，即信號在基函數(shù)上的投影。

Return loss is one of the important indices, which is used to evaluate the absorbing characteristic of the microwave anechoic chamber, so the test of it comes into one of the important aspects of examining the characteristic of th e microwave anechoic chamber.

微波暗室的回波損耗是衡量微波暗室吸收特性的一個重要指標(biāo)欧美熟妇性XXXX交潮喷免费看，因此對微波暗室的回波損耗的檢測是檢驗微波暗室性能優(yōu)劣的一個重要方面插a片。

Both sides in the Second World War relied heavily on these devices, under such codenames as Asdic and Sonar, as well as Radar or RDF, which uses radio echoes rather than sound echoes.

二戰(zhàn)中的交戰(zhàn)雙方都十分依賴這些儀器，諸如產(chǎn)品代號為早期潛艇探索聲納 ASDIC和聲納 Sonar還有雷達(dá)或無線電測向器 RDF看真人视频一级免费毛片，他們都使用無線電回波而不是聲波回波老熟妇乱子A片免费。

The echo canceler of the present invention includes a pseudo noise generator for generating a certain pseudo noise.

用于進(jìn)行回波路徑估測并去除話音障礙的回波消除器，包括用于產(chǎn)生一定的偽噪聲的偽噪聲發(fā)生器咬美女奶子舔她的逼视频。

The quantity computed is the expected clutter power at the output of any specified range gate by the method of integrating reflected energy between constant Doppler loci in range-gate circles with a model of sum and difference antenna gain pattern for APAR. Base on the analyzing of APAR terrain clutter spectrum, Rayleigh, Correlated Log-Normal and Weibull distribution terrain clutter of APAR general pulse signal was simulated with the method of zero memory nolinearity transform.④The Doppler frequency of target echo is simulated on video frequency in this dissertation.

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multi-channel correlators are widely used in traditional pseudo-random code cw radar,which makes the ranging system more complicated.this paper proposes a method of digitalizing the return signal directly and then convoluting the signals on dsp,which can replace multi-channel correlation in analog circuit.but the computation of convolution is too huge for the dsp to fulfill.to solve this problem,this paper analyzes five fast algorithms including fft,and then chooses one according to the characters of prc-cw radars.the digital method and fast algorithm have been verified by simulated signal and real signal.

摘 要：傳統(tǒng)的偽碼調(diào)相連續(xù)波雷達(dá)采用多路模擬相關(guān)電路實現(xiàn)對回波信號的相關(guān)接收国产精选午夜福利91在线，通過多路試探搜索各距離單元的目標(biāo)免费Av青草网站，電路復(fù)雜91自拍视频在线看。提出的數(shù)字化方案，對回波信號直接數(shù)字化WWW·日本熟妇人色视频，利用高速dsp實現(xiàn)數(shù)字卷積特黄捆绑一级A片，可替代多路模擬相關(guān)電路。但是直接卷積的運算量過大欧美男人天堂网，dsp無法承受人干人人干在线视频。本文對此進(jìn)行了研究，分析了包括fft在內(nèi)的五種快速算法欧美高清在线视频看片在线观看免费，結(jié)合prc-cw雷達(dá)的具體情況人人操人人摸人人干2010，確定了一種適于dsp實現(xiàn)的快速卷積算法。仿真和實測數(shù)據(jù)證實了數(shù)字化方案及快速算法的正確性a片在线观看哟哟哟。

Refer to the impacting-echo technology, we impacted the apex of the steel bar and incepted the reflecting stress \\ave through the resonator that fixed on the apex of the steel bar, and the value of the consolidating wave speed was calculated based on the timeof stress wave transmitted and the length of the steel bar, so, identifying the reflecting signal is the key of the consolidating wave speed method.

借鑒于沖擊回波技術(shù)人人色网，固結(jié)波速的測定方法是在鋼筋測桿的出露端施加瞬態(tài)沖擊載荷，由安設(shè)在測桿頂端的傳感器接收反射應(yīng)力波信號69免费视频，根據(jù)應(yīng)力波的走時和測桿的長度折算固結(jié)波速的大小乐播三级黄三区视频免费，因此反射信號的識別是固結(jié)波速法檢測混凝土強(qiáng)度的技術(shù)關(guān)鍵。

The return signal from propeller aircraft and jet plane in different SNR is simulated based on the statistic model of the disturbed clutter,a...

根據(jù)給定的目標(biāo)建模算法和干擾反射雜波模型日本三级欧美三级人妇视频，模擬了不同信雜比下螺旋槳飛機(jī)和噴氣式飛機(jī)的雷達(dá)回波国家aaaa级黄片，仿真結(jié)果表明，這兩種目標(biāo)具有不同的頻譜結(jié)構(gòu)18岁一下禁止观看的网站，證明了給出的模型是有效的亚洲国产高清一区二区三区不卡，為雷達(dá)系統(tǒng)提供了實用的回波仿真信號。

The return signal from propeller aircraft and jet plane in different SNR is simulated based on the statistic model of the disturbed clutter, and the calculated results are analyzed and compared. The results show that the model presented is valid and provides a useful simulated signal for the radar system.

根據(jù)給定的目標(biāo)建模算法和干擾反射雜波模型99热这里，模擬了不同信雜比下螺旋槳飛機(jī)和噴氣式飛機(jī)的雷達(dá)回波播放很快的你懂的的在线，仿真結(jié)果表明，這兩種目標(biāo)具有不同的頻譜結(jié)構(gòu)三级黄色视屏，證明了給出的模型是有效的永久在线观看国产日韩va，為雷達(dá)系統(tǒng)提供了實用的回波仿真信號。

To solve the exsisting problems in the realization of the LFM/CW radar, the thesis presents a technique for dynamically measuring the LFM/CW signals, which can accomplish the dynamic measurements of FM linearity, FM bandwidth and FM slop of the transmitted signals of LFM/CW radars. This technique creates an effective and accurate means of judging the performance of LFMCW radars. The linearity-correction techniques presented in the thesis successfully make the linearity of the transmitted signals of an actual LFM/CW radar reduce from approximately 25% to 0. 1%(or r. m. s linearity of 0.04%), better than the best results (0.22%) obtained by foreign researchers with complex linearization closed-loop in the same kind of LFM/CW radars, according to the published literatures during the last decade. In order to improve the capability of the real-time processing and range-cells management of LFM/CW radars, the principle of equivalent mixing by lacking-sampling process of band-pass real signals is proposed based on the well-proved improvedversion of sampling theorem of band-pass real signals. This principle is used to configure the range-segments processing of the beat signals of an actual LFM/CW radar. The techniques of system-background interference suppression and the beat signal's dynamic range suppression are proposed, and are realized in an actual LFM/CW radar to demonstrate their effectiveness.

針對線性調(diào)頻連續(xù)波雷達(dá)實現(xiàn)中急待解決的技術(shù)問題www.baoru.com，文中提出并驗證了線性調(diào)頻連續(xù)波信號的綜合動態(tài)測試技術(shù)亚洲色影院网站，可以完成對線性調(diào)頻連續(xù)波雷達(dá)發(fā)射信號的掃頻線性度黄色网站大全入口、掃頻帶寬和掃頻斜率的綜合動態(tài)測試，為衡量實際線性調(diào)頻連續(xù)波雷達(dá)的系統(tǒng)性能創(chuàng)立了精確有效的測試手段黄色视频国产在线；文中建立的非實時閉環(huán)動態(tài)校正技術(shù)使一部實際的線性調(diào)頻連續(xù)波雷達(dá)的發(fā)射信號（時帶積3×10〓）的掃頻線性度從25%改善為0.1%（方均根線性度0.04%）天天摸人人操人人爱，優(yōu)于國外已公布的80年代同類雷達(dá)中采用復(fù)雜的實時閉環(huán)動態(tài)校正環(huán)路所獲得的實際結(jié)果（0.22%）；為了改善線性調(diào)頻連續(xù)波雷達(dá)的實時性和分辨單元數(shù)處理能力欧美老妇乱码伦，文中發(fā)展完善了實帶通信號的采樣定理并給予了嚴(yán)格證明附近那有黄色A片，并在此基礎(chǔ)上提出了欠采樣等效混頻原理，將其應(yīng)用于實際線性調(diào)頻連續(xù)波雷達(dá)的距離分段處理中国产看黄一区；針對線性調(diào)頻連續(xù)波雷達(dá)中系統(tǒng)背景干擾和回波動態(tài)范圍問題色欲又色又爽一二三在线视频观看，創(chuàng)立了系統(tǒng)背景綜合抑制技術(shù)和頻域動態(tài)范圍壓縮技術(shù)，并將它應(yīng)用于實孔線性調(diào)頻連續(xù)波雷達(dá)系統(tǒng)中亚洲欧美激情小说图片，顯示出它們的有效性91人人摸人人干人人操。