heterodyne system 中文意思是什麼

heterodyne system 解釋
外差式
  • heterodyne : n. 【無線電】外差法，【無線電】外差法的，成拍的。vt. ,vi. （使）成拍，（使）致差，（使…）混合。
  • system : n 1 體系，系統；分類法；組織；設備，裝置。2 方式；方法；作業方法。3 制度；主義。4 次序，規律。5 ...
  1. Mixers are the key components of many microwave and millimeter - wave systems. the super - heterodyne receiver is always applied in modern communication system, mixer becomes the key component as is at the first part of system. but it is more and more difficult to get the choiceness lo source of the same band with the system is working at high frequency especially in the millimeter - wave. sub - harmonic mixer is a good solution to this problem now. in this circuit we need just half 、 quarter 、 even 1 / 8 of the rf signal frequency. in this paper the design and fabricate of sub - harmonic hmic mixers ( 2, 4 ) at w - band are introduced

    混頻器是微波通信、射電天文學、雷達、等離子物理、遙控、遙感、電子對抗，以及許多微波測量系統中至關重要的部件。在現代通信系統中，毫米波頻段通常採用超外差接收機，混頻器作為第一級就成為關鍵部件。由於在毫米波頻段，同頻段高性能的本振源成本高，技術難度大，採用分諧波混頻技術是解決此問題的有效途徑，只需射頻頻率1 / 2 、 1 / 4甚至1 / 8的本振頻率即可實現混頻。
  2. By using irm, heterodyne receiver with good image rejection and mmw - to - if once frequency conversion can be realized, which simplified receiver constitution prominently. the number of local oscillation ( lo ) sources is reduces and electromagnetic compatibility ( emc ) of mmw system is improved. also, the size, weight, power consume and cost of mmw receiver is reduced

    採用毫米波鏡頻抑制混頻器，可在保證鏡頻抑制性能的前提下，採用1次變頻接收機，從而大大簡化接收構成，減少本振數量，改善毫米波系統電磁兼容性，減小接收機體積、重量、功耗，並降低成本。
  3. Most laser ultrasonic nondestructive testing systems are based on the heterodyne principle, but the laser ultrasonic nondestructive testing system which is based on the homodyne principle

    而且目前所研製的激光超聲無損檢測系統基本上採用外差干涉的方式，而零差干涉方式國內尚未見到有相關報道，這屬于論文的主要創新點。
  4. In order to improve the existing pr adaptive optical heterodyne detection system ( praohds ), a new praohds is proposed based on sppc and mppc coexistence. the experimental study of the system is completed by equal amplitude ar + laser beams, poorly coherent equal amplitude solid - state laser beams and high speed amplitude - modulated solid - state laser beams through distorting media. experimental results indicate that the new system is applicable

    為了改進現有的光折變自適應光外差探測系統（ praohds ） ，本文利用sppc和mppc同時共存的特性，提出了一種新型的praohds ，並利用ar ~ +等幅激光、相干性較差的固體等幅激光以及固體高速振幅調制激光對新系統進行了畸變光束的自適應光外差探測實驗研究，結果證明了新系統在實際應用中的可行性。
  5. And typical super heterodyne structure in rereiver part. this scheme benefited to reduce frequency error and phase error, and had the advantages of good dynamic range and selectivity, short exploitation cycle and small venture in the given performance demand, etc. this system implemented a six - layer hoard rf handset model together with baseband by using advanced eda tool veribest 2000

    系統設計應用hd155131的gsm900 dcs1800雙頻解決方案，發射機部分主要採用offsetpll方案，該方案有利於減小系統的頻率誤差和相位誤差；接收機部分採用典型的超外差式結構，它具有優良的動態范圍和選擇性，在給定的性能要求下具有開發周期短、風險小等特點。
  6. More, this paper discusses some important performance parameters of the coherent self - heterodyne botdr system, such as dynamic ranges, spatial resolution, minimum detectable change

    在此系統基礎上，本文討論分析了相干自外差探測系統以及該botdr系統的動態范圍、空間解析度、最小可探測溫度/應變變化量等重要性能參數。
  7. Based on this, we bring forward a availability and viable distributed fiber sensing for temperature and strain system that based on spontaneous brillouin scattering, coherent self - heterodyne botdr, and done part experimental study

    在此基礎上，提出了一種有效可行的基於布里淵散射的分散式光纖溫度/應變傳感系統? ?相干自外差的布里淵散射分散式光纖傳感系統，並完成了部分實驗研究。
  8. Be different with other botdr systems, the coherent self - heterodyne botdr system uses only one consecutive laser. the light from consecutive laser is divided into two beams, the detecting light and the reference light, by a coupler

    與其他的botdr系統分別使用兩臺激光器不同，自相干外差的布里淵散射分散式光纖傳感系統採用一臺激光器，經耦合器分為兩路光束? ?探測光和參考光束。
  9. The theory of the optical heterodyne measurement system is expounded and the principle and merit of ultrasound pulse generated by a laser pulse are analyzed

    對光外差系統的測量原理進行了說明，分析了由激光脈沖激勵超聲的原理和優點。
  10. The testing principle of the system is explained and the two components of the system including the optical heterodyne measurement system and the system of ultrasound pulse generated by a laser pulse are introduced

    課題採用一種結構簡單、易調試的光外差超聲無損探傷系統，對其探傷機理進行了說明，介紹了組成系統的兩部分:光外差測量系統和激光脈沖激勵超聲部分。
  11. The signal - to - noise ratio of the nondestructive testing system employing optical heterodyne and ultrasonic techniques is analyzed and calculated from two aspects including phase matching of optical heterodyne measurement in nondestructive testing and the effects of beam incidence on the intensity of heterodyne signal and signal beam

    對光外差超聲無損探傷系統的信噪比從兩個方面入手進行了計算分析:第一，光外差測量在無損探傷中的相位匹配;第二，光束入射角對信號光光強和外差信號強度的影響。
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