測距頻率 的英文怎麼說

中文拼音 [cèjùbīnlǜ]
測距頻率 英文
range frequency
  • 測 : 動詞1. （測量） survey; fathom; measure 2. （測度; 推測） conjecture; infer
  • 距 : Ⅰ名詞1 （距離） distance 2 （雄雞、雉等的腿的後面突出像腳趾的部分） spur （of a cock etc ）Ⅱ動詞...
  • 頻 : Ⅰ形容詞（次數多） frequent Ⅱ副詞（屢次） frequently; repeatedly Ⅲ名詞1 [物理學] （物體每秒鐘振動...
  • 率 : 率名詞（比值） rate; ratio; proportion
  • 測距 : range [distance] finding; distance measurement; ranging; stadiometry
  • 頻率 : frequency; rate
  1. ( 2 ) gene flow frequency was reduced as distance from pollen donor increased and a dramatic reduction occurred at about 2 meters. the maximum distance where gene flow was not detected was 50 m for hybrid rice while it was 70 m for ms lines, with an exception that in one of the four ms lines it was detected a frequency of gene flow 2. 8 + 10 - 6 at 150 m for zhong 9a

    在開花期主流風向ne的風速為0 . 2 ? 2 . 2m / sec的條件下， 2個雜交稻品種的最大漂流距離為40m ； 4個不育系的基因漂流基本上到60m為止， 70m處基因漂流頻率均降為0 ，僅中9a在150m處發現了1株basta抗性苗，經pcr檢測驗證為陽性。
  2. Each observation could have been weighted inversely as the distance or as the square root of the frequence.

    每次觀測可以倒過來加權作為距離或作為頻率的平方根。
  3. Due to the short distance among the planes which fly in a group, the conventional low resolution radar can not distinguish them in both distance and azimuth ? if we use the technology of isar to resolve the difference among doppler frequency of the targets and obtain a fine resolution cross - cross image, we may separate them, but a long time of coherent processing is needed <, for the formation targets, it can be approximately divided to rigid body and nonrigid body, so for the formation targets, that can be regarded as rigid which has a relative position and an identical movement, can be approximately considered as a large target, and be compensated by translational phase with the rule of minimum entropy, but for the most those cannot accord with the approximation of rigid, being the doppler - frequency of the aim is linear changed, by the relax method with short data, increases the resolving performance of multiple target to the aim in the frequency domain, since cross - range resolution is based on the accumulative time, so it is greatly improve the resolution to formation targets by the instant cross - range image which produced by radon - wigner transformation

    低分辨isan成像及干涉技術應用研究一因此直接無法分辨編隊目標的架數，我們借鑒isar的技術，通過較長時間的相干積累，在多普勒頻域上對目標進行分辨。而對于編隊目標，可分為近似剛性的多目標和非剛性的多目標，所以對于可以近似為剛體的編隊目標相對位置固定，運動方式一致，可以近似看作一個大目標，採用最小墑準則對平動相位的進行補償，但是大多數並不滿足剛體近似的編隊目標，由於目標在相干積累時間的多普勒頻率近似呈線性變化，通過對較短數據利用relax的時頻分析方法，提高了頻率域上目標分辨的性能。由於橫向解析度取塊于橫向積累時間，所以利用radnwigner變換得到瞬時的一維橫向距離像大大提高了對編隊目標的分辨，對模擬和實測數據的大量分析結果表明此方法的有效性和可行。
  4. This dissertation mainly researches the displaced phase center antenna ( dpca ) technique in the new system, and the contributions are calculated as following : 1. the doppler history is analyzed for the spaceborne bistatic sar, doppler center frequency and doppler fm rate computational methods are studied. summing up is done for the methods of moving target detection and imaging

    本文完成的主要工作有: 1 .分析慢速運動目標信號特徵以及運動目標對sar成像的影響（多普勒中心頻率，多普勒斜率以及距離徙動誤差） ，總結了目前sar運動目標檢測與成像的主要方法。
  5. In the end, the system experiments were conducted, and the results show that the system can be used for short - distance ranging

    最後採用延遲線閉環系統聯調，實驗結果表明所設計的測距方案能夠用於近距距離測量，差頻信號頻率反映了距離信息。
  6. Ftt makes the frequency sampled at a same frequency interval on unit circle, and the frequency interval limits the practical range - precision of the radar, and makes range precision at an equivalent level with range - resolution

    由於fft的實質是頻率在單位圓上的等間隔采樣，其采樣間隔限制了雷達的實際測距精度，使得其測距精度與其距離分辨力處于同一量級。
  7. The scheme is designed based on these researches. for traditional laser rang finders, most of them use heterodyne method as the phase shift measurement. the advantage of heterodyne method is the high measurement accuracy, but its disadvantage is the low measurement velocity

    傳統的相位激光測距大部分都採用差頻數字測相，差頻測相的優點在於由於頻率的降低，這樣必然意味著測距精度的提高，但其缺點是測距速率低。
  8. According to the target distance ( 5 ~ 50m ), a c - band transceiver for ranging was presented in this thesis. the focus of this work was on designing a c - band frequency - modulated continuous - wave ( fmcw ) frequency source, a receiver and microstrip antenna

    本文針對所探測目標的距離（ 5 ~ 50m ） ，研製了c波段測距收發前端，主要包括c波段調頻連續波（ fmcw ）頻率源，接收電路以及微帶天線。
  9. 1 ) the ground clutter is very strong when radar works in its down - look mode. 2 ) the clutter has the character of space - time coupling and the clutter spectrum spreads due to the movement of platform. 3 ) the lower repeat frequency results in doppler blur and the clutter spectrum spreads in the whole doppler domain

    地面動目標檢測的最大難點： 1 ）雷達下視時地雜波特別強; 2 ）由於平臺運動，地雜波存在著空時耦合，雜波譜展寬； 3 ）為避免距離模糊，採用較低的重復頻率，但會存在多普勒模糊，地雜波譜擴散到整個多普勒域。
  10. Electrical parameter includes voltage, current, power, frequency, power factor, and so on. the adjustment system of electrical network needs many panel instruments that can show the electrical parameter, such as voltage, current, power, cycle etc. tjsually these instrument is not accurate, wastes manpower resource, and the management of the data is inconvenient and easy to mistake. recently the development of micro - electronics technology and the advent of slsi. especially the advent of singlechip, lead to a new revolution in the field of instrument

    電工參數一般包括電壓、電流、功率、頻率、功率因數等。在電網調度自動化的設備中需要配置多隻測量顯示上述電工參數的鑲嵌式面板表，如電壓表、電流表、功率表等等，其一般均為指針式面板表，精度低，可視距離近，數據需要人工抄錄，浪費人力資源，數據管理不便，容易出錯。
  11. As a new communication mode, the spread spectrum communications are widely used in military communication, distance finding and precise position, because of its well multiaddress access, lowly capture probability, the excellent performance of anti - interference and secrecy

    擴頻通信作為新型的通信方式，以其優良的多址接入、低截獲概率特性、抗干擾特性和強保密性被廣泛應用於軍事通信、測距與精確定位。
  12. The some fire control system is an advanced multi - senor short range air defense system, which integrated both x and ka bands searching and tracking radars, laser range finder, combined the control computer of subsystem with the master computer, and applied the technology of data fusion

    摘要某火控系統集兩個頻率波段的搜索雷達、跟蹤雷達和電視跟蹤器、激光測距機於一體，分系統控制處理計算機與系統主計算機相結合，採用了數據融合技術，是一部多傳感器集成的現代化防空系統，具有搜索性能好、反應時間快、抗干擾能力強、自動化程度高、使用性能好等特點。
  13. Theoretical model of self - mixing interference in a linear frequency modulated laserdiode is presented by using the dynamic theory of semiconductor laser with weak external optical feedback. the characteristics of oscillation frequency shift and output power changes of the laser diode are analyzed by using the theoretical model. the absolute distance from front facet of laser diode to target can be found by measuring spectrum of output power of the laser diode

    使用半導體激光器在弱反饋條件下的動力學理論，建立了線性調頻半導體激光器的自混頻干涉理論模型.基於該模型，分析了激光器振蕩頻率偏移與輸出功率變化特性.通過測量激光器輸出功率譜，可以得到激光器前端面與被測目標之間的距離
  14. In the primary experimental study, the microwave power, the microwave frequency, and the mode are measured, hie relations among the microwave radiation, the intensity of the magnetic field, the position of the magnetic coil, the amplitude of the beam current, and the a - k gap are investigated

    在初步的微波實驗中，測試了微波的功率、頻率和模式，測試了磁場強度和線圈位置對微波輻射輸出的影響，測試了束流大小和陰陽極間距對微波輻射輸出的影響。實驗結果發現微波的功率和模式基本與模擬結果吻合，器件工作穩定，重復性良好。
  15. After analyzing the range vernier ' s principle, the needed data is presented in applying range vernier to modern radar, including range data, i / q data and doppler frequency data

    通過對游標測距原理的分析，得到了實現游標測距所需的雷達測量數據，即距離數據、基帶i / q數據和多普勒頻率數據。
  16. Pulses in the nanosecond and subnanosecond regimes with high power and high repetition rate have wide applications in lidar, ranging, remote sensing, microsurgery, micromachining, and so on

    高峰值功率、高重復頻率的納秒至幾百納秒的脈沖激光，廣泛地應用於激光雷達、激光測距、遙感遙控、微型手術和微型機械方面。
  17. This method constructs covariance matrix by utilizing data vectors in different range lines and projects phase error vector into noise sub - space which is formed by eigendecomposing the covariance matrix

    該方法利用不同距離單元的觀測矢量構造協方差矩陣，然後通過對協方差矩陣特徵分解得到噪聲子空間，最後將相位誤差矢量向噪聲子空間投影來估計多普勒調頻率。
  18. Because of the advantages of no range blind area, high range resolution, low signal power and simple structure, lfmcw ( linear frequency modulation continuous wave ) radar attracted more and more attention recently

    線性調頻連續波（ lfmcw ）雷達是一種通過對連續波進行頻率調制來獲得距離與速度信息的雷達體制系統。由於其具有無距離盲區、高距離解析度、低發射功率、結構簡單，便於集成化等優點，適合用於液位測量系統。
  19. This algorithm successfully estimated sonobuoy position for simulated aircraft data. the effect of aircraft - to - sonobuoy range, the frequency of measurement, and changes in altitude are also analyzed

    模擬表明，對于給定的飛行模式和飛機參數，該演算法可以成功地估計浮標的位置，並且分析了飛機與浮標的距離、測量頻率和飛行高度對定位的影響。
  20. According to the requirement of measurement accuracy and velocity, a novel twofold frequency laser ranging method based on phase ranging technology is proposed

    根據本課題測距精度和測距速率的指標要求，針對現有激光測距方法的局限性，提出了雙頻測相相位式激光測距方法。
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