chirp signal造句
例句與造句
- Performance comparison between noise signal and chirp signal in correlation measurement
相關(guān)法測量中的噪聲信號源和掃頻信號源的性能比較 - In order to obtain high range resolution , the chirp signal is used as subpulse to form stepped frequency modulated radar signal
摘要為了獲得高距離分辨率，將線性調(diào)頻信號作為子脈沖構(gòu)成調(diào)頻步進(jìn)雷達(dá)信號。 - Chirp - subpulse stepped frequency signal is one of the high distance resolution signals with merits of stepped - frequency signal and chirp signal
Chirp子脈沖頻率步進(jìn)信號兼有頻率步進(jìn)信號和線性調(diào)頻信號的優(yōu)點,是一種高距離分辨力信號。 - By combining the chirpogram and the mean likelihood estimation with mrkov chain monte carlo technique , it is shown that accurate estimates can be obtained for chirp signals
此方法將均值似然估計和調(diào)頻圖應(yīng)用于mcmc中,避免了極大似然估計中的積分運算和多維搜索,減少了計算量。 - Chirp signal is a kind of pulse - compressed signal with large time - bandwidth products achieved through linear frequency modulation . it has high resolution in range because of its great bandwidth
線性調(diào)頻信號是通過線性頻率調(diào)制獲得大的時寬帶寬積的一種脈沖壓縮信號，具有大的帶寬，因此有高的距離分辨力。 - It's difficult to find chirp signal in a sentence. 用chirp signal造句挺難的
- ( 5 ) based on subspace orthogonal algorithm , a method for estimating the parameters of wide - band chirp signal is studied . it is shown that accurate estimation can be obtained for wide - band chirp signal even under low signal - to - noise ratio ( snr )
( 6 )基于dft原理和fft技術(shù),提出了適用于非高斯噪聲環(huán)境的線性調(diào)頻參數(shù)估計的快速離散chirp傅立葉變換( dcft )算法。 - For multicomponent chirp signals with unbalanced amplitudes , an iterative algorithm combined with the paf is proposed to suppress the error propagation effect and residual signal in the peeling - off procedure . the corresponding time - frequency distribution for unbalanced signals is derived
針對多分量強(qiáng)弱信號,引入基于逐次減小誤差的迭代算法,導(dǎo)出了能夠減小強(qiáng)弱信號相互影響的核函數(shù)設(shè)計方法,從而有效抑制誤差傳播和殘余信號。 - First of all , by establishing the observation model of complex harmonic signal and complex linear chirp signal respectively under the co - jamming of additive and multiply noise , the paper constructed cyclic moment detectors of different orders , deduced snr expression of the detector through theoretic analysis , discussed the relation of detector performance and noise statistical characteristic . the curve of detection performance is obtained through monte carlo simulation test , proving the related conclusion derived
首先，論文分別以加性和乘性噪聲聯(lián)合干擾下的復(fù)諧波信號和復(fù)線性調(diào)頻信號為觀測模型，構(gòu)造了基于不同階次的循環(huán)矩檢測統(tǒng)計量，從理論上推導(dǎo)出了檢測器的信噪比表達(dá)式，分析了檢測器性能與噪聲統(tǒng)計特性的關(guān)系，通過monte - carlo仿真試驗得到了檢測性能的曲線，驗證了推導(dǎo)的有關(guān)結(jié)論。 - Two detection methods of chirp signals are presented in the dissertation : the cyclic autocorrelation detection method and the correlation detection method of cyclic autocorrelation function . it is shown that the two methods both have an excellent performance of blind detection . the performance analyses of the two detection methods are both carried out for additive noise or multiplicative noise , and the output signal - to - noise ratio ( snr ) expressions of the two methods are also derived
通過研究提出了兩種線性調(diào)頻信號的檢測方法?基于循環(huán)自相關(guān)函數(shù)包絡(luò)的檢測方法和基于循環(huán)自相關(guān)函數(shù)的相關(guān)函數(shù)包絡(luò)的檢測方法，兩種方法均可實現(xiàn)信號的盲檢測，有良好的檢測性能，文中還分析了加性噪聲及存在乘性和加性噪聲情況下兩種檢測方法的性能，推導(dǎo)出了輸出信噪比公式。 - The cyclic estimation approaches of chirp signals in additive nose or multiplicative noise are proposed , it presents a way for the parameters estimation of zero mean amplitude chirp signals . the estimation performances in the additive noise or multiplicative noise are analyzed by the first order perturbation analysis method , and the error variance expressions of the parameters estimation under large samples are derived
針對加性噪聲情況及存在乘性噪聲的情況，提出了線性調(diào)頻信號參數(shù)的循環(huán)平穩(wěn)估計方法，解決了零均值乘性噪聲的信號參數(shù)估計問題，并采用一階擾動分析方法，對兩種噪聲情況下的估計性能進(jìn)行了分析，推導(dǎo)出了各參數(shù)的估計誤差方差公式。 - Considering the fact that the analog system is not so good as the digital system on the respect of variation of bandwidths and on the respect of switch between different bandwidths . this paper proposes to adopt the dds ( direct digital synthesis ) technique that produces chirp signals of different bandwidths to improve the situation of losing tracks for the ocean satellite altitude indicator in measuring coarse surfaces
現(xiàn)在的雷達(dá)基本上采用模擬系統(tǒng)產(chǎn)生線性調(diào)頻信號，由于模擬系統(tǒng)在帶寬變化方面和不同帶寬間切換方面不如數(shù)字系統(tǒng)，本文采用dds （ directdigitalsynthesis ）技術(shù)產(chǎn)生不同帶寬的線性調(diào)頻信號以改善海洋衛(wèi)星高度計在測量粗糙表面時存在的失鎖現(xiàn)象。 - ( 1 ) . here we build the system space geometry model : the transmitter and receiver fly on different platforms and at different height , two flight paths are unparallel . based on the chirp signal and the taylor series , we analyze the range history and synthetic aperture time , then demonstrate the equation of the azimuth resolution about air - born bistatic spotlight synthetic aperture radar , meanwhile we obtain the equations of doppler bandwidth and doppler frequency modulate rate
本文以機(jī)載聚束式合成孔徑雷達(dá)成像作為研究背景,主要完成了以下幾方面的工作: ( 1 )建立了一種機(jī)載雙站聚束式sar空間幾何數(shù)學(xué)模型,對方位分辨力進(jìn)行了理論分析,進(jìn)行了數(shù)值分析與仿真,討論了不同條件對雙站聚束模式sar系統(tǒng)分辨力的影響。 - The reseach work focused on the time delay estimation of the common practical radar singnals , including harmonics signal , chirp signal , polynomial phase signal , and phase - shift keying signal . the new algorithm for different radar signals are deduced in detail respectively , and simulation results are presented . the results proved that the new method is efficient for time delay and some other parameters estimation
正弦信號、線性調(diào)頻信號、多項式相位信號、相位編碼信號是雷達(dá)信號中常用的幾種信號,對這幾種信號的研究是雷達(dá)信號處理中非常重要的內(nèi)容,也是實際工程的需要。因此,本文選擇上述幾種信號作為研究對象,對這幾種信號的時延估計算法進(jìn)行了建模和理論推導(dǎo),給出了時延估計算法的具體表達(dá)式,并進(jìn)行了計算機(jī)仿真。 - To improve anti - jamming technique by spread spectrum close to monochromatic frequency , so that enhance the ability of anti - active - jamming and anti - passive - jamming , anti reconnaissance , anti - radiation missile , anti - stealth , by means of multi frequency spread spectrum and hopping spectrum instead of mono - frequency spread spectrum , realizing strong processing system for anti - interference signal , providing the method of generating of chirp signal and corresponding matched filter system
摘要為改進(jìn)線性調(diào)頻雷達(dá)系統(tǒng)所采用的在單色頻率點附近擴(kuò)譜抗干擾技術(shù)，加強(qiáng)制導(dǎo)雷達(dá)站具備抗有源、無源干擾，反偵察，抗硬殺傷的反幅射導(dǎo)彈和反隱身的能力，通過將單頻點擴(kuò)譜改為多頻點擴(kuò)譜跳譜，實現(xiàn)了高抗干擾信號處理系統(tǒng)，給出方案中在中頻段實現(xiàn)的線性調(diào)頻信號產(chǎn)生方法以及對應(yīng)的匹配濾波處理系統(tǒng)。 - The principle of vibrator is to introduce scattered energy to underground in a comparatively long time , and collect the energy through correlation and compress it into a narrow pulse . the portable high - frequency vibrator system , developed by key lab of geo - exploration and instrumentation ( jilin univ ) , ministry of education , generates chirp signal and accumulates energy through a long - time bestiring . according to the characteristics of vibrator , the seismic recorder that operates on - line with vibrator must have these functions as follow : first , it must have the ability of recording a great quantity of data . second , it must have assistant channels to sample reference signal . third , it must have the function of data correlation in real - time
可控震源利用可控的小能量、長時間激發(fā)波來實現(xiàn)沖擊震源瞬時產(chǎn)生的大能量激發(fā)波。在利用可控震源進(jìn)行地震勘探時,要求地震儀長時間記錄地震信號,這對地震儀的采樣長度提出了很高的要求。受存儲量和數(shù)據(jù)傳輸速度的限制,絕大多數(shù)地震儀很難對如此大的數(shù)據(jù)量進(jìn)行記錄,同時,可控震源要求地震儀有兩個輔助通道并且具有數(shù)據(jù)相關(guān)功能,目前國內(nèi)還沒有出現(xiàn)滿足要求的地震儀產(chǎn)品。
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