doppler receiver 中文意思是什麼
doppler receiver
解釋
多普勒接收機-
By complementing the proposed scheme with methods to estimate the fractional code delay, the acquisition unit an provide high quality delay estimates such that it can instead of the delay locked loop in the traditional ds receiver. after dispreading successfully, this dissertation introduces a method to estimate the doppler - shift directly from some samples based maximum likelihood estimation, and then revise it forwardly
在成功解擴之後，本文利用最大似然估計從l個樣點中直接估計出殘余多普勒頻偏，並進行前向頻偏校正，來代替傳統擴頻接收機中的科斯塔斯環，經模擬證明該方法的估計精度完全滿足解調的要求。 -
A chirp scaling algorithm for airborne bistatic sar is proposed, which is suitable for the flight configuration that transmitter and receiver follow parallel path with equal velocity in broadside looking mode. airborne bistatic sar echoed signal model of this particular flightpaths is derived. the model is converted into the range doppler space and is mapped from double range variables to single range variable domain
本文建立了這種特殊飛行模式下雙基地sar的回波信號模型，推導了它在距離多普勒域的表達式，解決了信號模型從雙距離變量域向單距離變量域轉化的問題，並推導了cs因子的線性近似表達式，分析了演算法中各種近似造成的誤差。 -
A typical bistatic weather radar net work is comprised of one traditional transmitter - receiver radar and one or more passive non - transmitting radar receiver at remote site. this type of multiple radar network offers unique advantages when compared to traditional radar net work. this paper introduces the concepts and principles of bistatic weather radar network and analyses, simulates, calculates the basic concepts of effective scattering particle volume relative to the receiver of bistatic radar network, the doppler shifts of the received signals, gives the formula to conduct the three dimensions wind field
本文從原理上分析了雙基地天氣多普勒雷達的構建、基本幾何關系、有效散射體積及其與雙基地角的關系，有效散射體積和目標與雙基地天氣多普勒雷達主站發射機的距離的變化關系，指出雙基地天氣多普勒雷達有效體積和單基地雷達有效照射體積隨之距離的變化有相似之處，但是由於收發分置的幾何結構，雙基地天氣多普勒雷達的性質與雙基地大氣多普勒雷達的散射角有著密切的關系。 -
This thesis discusses the pulse doppler ( pd ) weather radar signal processing system including digital intermediate frequency ( if ) receiver, especially on the application of if sampling and digital demodulation technique in pd weather radar signal processing system, the influence of amplitude and phase unbalances of in - phase and quadrature channels on weather radar echo spectrum estimation, ground clutters elimination algorithms and a typical engineering realization scheme of pd weather radar signal processing system
本論文研究的是採用數字中頻接收技術的脈沖多普勒氣象雷達信號處理系統，重點研究了中頻采樣及數字解調技術在脈沖多普勒氣象雷達信號處理系統中的應用、正交雙通道幅相不平衡對氣象回波譜估計的影響、地雜波濾波演算法，以及脈沖多普勒氣象雷達信號處理系統的具體工程實現。 -
The procedure can not only resist the influence of outlying kinematic model errors, but also control the effects of measurement outliers. 9. the precise velocity can be determined respectively with precise positioning results, receiver raw doppler measurements and carri
討論了gps姿態測量中模糊度解算、姿態角解算等問題，並基於非專業姿態測量接收機，給出了gps姿態測量的初步結果。 -
Combined with the data - selected schemes proposed, the computational complexity of this method can be lowered. the performance of the presented rls method is analyzed by simulations, and it is shown that this method is interesting for application. 4 time - selective channel signal model based on multipath - doppler diversity representation is given in multi - path fast fading channel, and rls space - time receiver algorithm based on time - varied constraint condition is presented and the computational complexity of this method is analyzed
4 、針對多徑快衰落通道下的ds - cdma系統，給出了基於多徑-多譜勒觀點描述的1百安電弓卜科東兔j憶學協士學位論文時間選擇性通道的信號模型，提出了基於變約束條件下的遞歸最小二乘空時接收機演算法並分析演算法的運算量，最後通過模擬分析了所提出的方法的性能。 -
There are two uncertain factor about it : the phase of the pn code and the doppler - shift. after capturing the received signal successfully, the traditional ds receiver always uses a delay locked loop ( dll ) to synchronize the pn code and then uses a costas loop to realize the carrier synchronization. this complex closed - loop structure not only take long time to realize the synchronization, but also has the defect of “ hang up ”
傳統的擴頻接收機通常在捕獲偽碼信號后利用遲早門鑒相的延時鎖定環來實現偽碼的精同步，解擴后利用科斯塔斯環實現載波同步，這種閉環結構不僅同步時間長、結構復雜，而且鎖相環還存在所謂的「 hang - up 」現象。 -
The movement of the satellites causes doppler frequency to drift, the receiver usually tracks the signal frequency the receiver through phase locked loop, in order to can demodulate the signal
衛星運動造成多普勒頻率漂移，接收機一般都採用鎖相環來跟蹤接收信號頻率，以便能正確解調信號。 -
This thesis adopts 8psk / qpsk modulation mode that ' s widely applied in short - wave communication to research all - digital blind receiver in burst mode based on software radio technology. then related solutions are given for the doppler frequency shift problem and multiple fading problem in short - wave channels. the arrangement of the thesis is below : chapter 1 gives brief description for the new technology and new systems of short - wave communication and for the development and appliance of software radio
本文採用短波通信中應用廣泛的8psk qpsk調制方式，研究基於軟體無線電技術的突發模式全數字盲接收機，並對多音并行及慢速傳輸中存在的多譜勒大頻偏問題、單音串列、高速數傳時在短波通信鏈路中發生的干涉衰落問題做了研究，提出了相應的解決方案。 -
( 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
本文以機載聚束式合成孔徑雷達成像作為研究背景，主要完成了以下幾方面的工作: （ 1 ）建立了一種機載雙站聚束式sar空間幾何數學模型，對方位分辨力進行了理論分析，進行了數值分析與模擬，討論了不同條件對雙站聚束模式sar系統分辨力的影響。 -
In order to monitor the satellite, carrier to noise ratio estimator is needed in receiver. the widely used carrier to noise ratio estimator is sensitive to residual doppler frequency. we present a new estimator whose property is somewhat better than the widely used one
以上的研究均以實際應用需求為出發點，充分考慮了實際實現中的可能會遇到的問題，其中載噪比估計及載波跟蹤技術已成功地應用到某國防重點型號的接收機中。 -
The other is time - space 2d - rake receiver based on space - time channel estimation ( spce - 2drake ). simulation results reveal that this algorithm has the better performance under the different doppler frequency. the performances of these space - time 2d - rake receivers are analyzed
模擬表明: zf - 2drake接收機性能優于傳統的2d - rake ; spce - 2drake接收機在不同多普勒頻移情況下具有較好的性能，而且實現容易。 -
Based on these studies, the properties of doppler and resolutions are analyzed. because the imaging algorithm of bistatic sar is related to the geometry models, the dissertation gives particularly empathies on the parallel model and the static receiver model in the broadside side - looking and stripmap
本文首先建立了任意飛行模式下雙基地sar的幾何模型和回波模型，分析了其多普勒特性和解析度特性，得出雙基地sar成像演算法與飛行模式有密切關系的結論。
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