The peak time detecting circuit which is composed of full-wave rectification circuit and differential circuit can detect the reach time of echo signal accurately.

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Therefore this way is feasible, and the system is simplified.⑤A procedure of analyzing in target echo theory and simulation for APAR is described in the dissertation.

因而在視頻上模擬目標(biāo)回波的多普勒頻率的方法是可行的永久免费域名18勿进，并且簡化了系統(tǒng)；⑤對機載相控陣?yán)走_(dá)目標(biāo)回波的理論分析和模擬實現(xiàn)進行了深入研究国模逼，在目標(biāo)回波模擬系統(tǒng)方案中采用了用一路目標(biāo)信號通過和中文字幕在线爱、差波束天線方向圖增益進行調(diào)制并用移相器控制和、差通道相位的方法亚洲综合卡通动漫第三页，產(chǎn)生目標(biāo)三個通道的信號毛毛黄片。

An efficient central ellipse algorithm for estimating the echo peak positions of ultrasonic sampling was presented to find the accurate receive time of echo by searching the peak of energy bursts, which is base on the theories of energy centrobaric correction method and least square method in the ultrasonic ranging system.

基于能量重心校正法和最小二乘法的原理，提出了一種改進型橢圓中心超聲回波尋峰算法：通過曲線擬合搜索橢圓中心點欧美一级大黄zzoo，即回波信號能量集中點影音先锋迷奸，進而找到回波信號的峰值點。

At last,this paper analyzed the influence of the inversive receiver to the chracteristic of the clutter and the ratio of signal power and the noise power ,discussed the effective detection of target signal in correlated clutter,and then put forward a new method naming multi-periods shift accumulation for detecting moving target when not knowing the exact movement parameter.

最后狼友在，本文分析了倒置接收對目標(biāo)回波信噪比及雜波特性的影響国产精品亚洲精品专区，討論了在相關(guān)雜波區(qū)對回波信號有效檢測的方法。針對如何在彈目相對運動參數(shù)未知的條件下對高速運動目標(biāo)進行積累檢測這一問題激情小说激情视频，提出了一種多周期移位積累的新方法激情小说亚洲色图激情视频。

Through Hilbert transform, a signal's plane trace can be get. There are two frequencies in the tested signal, so the signal's plane trace may be looked as the track of the out pole's end when two poles rotate around parallel axles. Using the knowledge of motion synthesis in theory mechanics, a formula to describing the change of plane trace's step length and angle for two-frequency be get. So we may prolongate the tested signal's plane trace from the echo's initial arriving moment, and get a certain length of the signal's prolongation.

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By this model, the target IF return of sum, difference and SLB/SLC antenna channel of the trilobe of frequency-phase scanning 3-D radar could be represented in one uniform expression accurately.

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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.

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The motion dynamics and echo models of the precessing warhead in single frequency are set up. Based on a quantitative analysis on echo spectrum and micro-Doppler modulation of precessing cone, a precession parameter estimation method by echo correlation and spectrum width is proposed. The experiments on data by simulation and darkroom measurement verify the method.

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Negative CG flashes usually occurred in intense echo regions with reflectivity greater than 50 dBz, while the positive CG flashes often occurred in weak and stable echo regions(10-30 dBz) or cloud anvils, although they can be observed in strong convective regions sometimes.

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The emphasis in this composition is windshear signal processing technology. Some processing methods are introduced in detail, they are suppressing clutter,extracting windshear parameters,computing hazard factor and etc..The signal processing simulation is accomplished on computer, it includes simulating microburst echo signal,simulating ground clutter echo signal,filtering clutter,estimating wind speed and calculating hazard factor.

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