調頻中心頻率 的英文怎麼說
中文拼音 [diàobīnzhōngxīnbīnlǜ]
調頻中心頻率
英文
average frequency- 調 : Ⅰ動詞1 (配合得均勻合適) harmonize; suit well; fit in perfectly 2 (使配合得均勻合適) mix; adju...
- 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
- 調頻 : frequency modulation (fm); frequency adjustment調頻磁帶錄音機 f m magnetic tape recorder; 調頻...
- 頻率 : frequency; rate
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Supervisor point is behind the postposition of power amplifier, optic signals coming from a tap of 99 : 1 enter into optic spectrum scan module, then the power levels which have been calculated by iterative algorithmic are sent to power control module to guide a set of tunable electronic attenuators
此方案將監測點放在後置功率放大器的後面,從分束器中分出99 : 1的光進入光頻譜掃描模塊,傳給功率控制模塊的光功率值經過選代演算法后計算出均衡后的功率值送到功率控制模塊的控制中心去調節電可調節衰減器。Both fine and coarse center frequency controls, combined with a scanwidth selector provide simple frequency domain measurements from 100 khz div
中心頻率控制有微調和粗調,掃頻寬度選擇從The center frequency of the vco is 14. 14ghz with band width of more than 100mhz. the output power is 2 ~ 6mw
根據測試結果,該vco電路的中心頻率為14 . 14ghz ,調頻帶寬大於100mhz ,帶內輸出功率在2 6mw之間。However, the farther analysis in the paper indicates that the strategy of parameter configuration in current connection pool technique is static state with 1 - order enactment while initializes connection pool without self - optimized adjustment according as the variety of application demand, the operation results of high use frequency database are not cached and users visit the same database independently. the multi - propose connection strategy cannot control the database operation for the same transaction and cannot ensure the acid attribute, etc. in according with the defections mentioned above, the service technique of self - optimized connection pool is presented in this paper and the composing structure for self - optimized connection pool is designed, then, some strategy in dynamic parameters adjustment, transaction management and data cache for connection pool is improved
然而,通過本文的研究分析,現有數據庫連接池技術的參數配置策略是靜態的,連接池初始化時進行一次設定,不能根據應用需求的變化而動態調整;連接池的核心管理機制中,沒有對使用頻率較高的數據庫操作結果進行緩存,多個用戶依然各自獨立地完成相同的數據庫訪問;使用的連接復用策略無法控制屬于同一個事務的多個數據庫操作,不能保證事務的acid屬性等。The new technology of non - contact life - parameter detection is relative to that of the normal contact one, which uses microwave beams to illuminate the human subject, whose reflected wave will be modulated by the surface movement resulting from the physical activity. by this way, some parameters of the reflected wave, such as frequency and phase will be changed. if these changes can be detected, the life parameters such as respiration rate and heartbeat rate will be extracted from those changes
非接觸生命參數檢測是相對于常規的接觸式檢測而言的一種新技術,它利用微波束照射人體,其回波信號被人體生命活動引起的體表微動所調制,使得回波信號的某些參數(如頻率、相位)發生改變,檢測到這些變化就能從中提取出人體的生命參數(如呼吸或心跳) 。Accompanying power system reformation, chongqing power network will be merged into the middle china power network. according to national " power attempt communicating center assessing measure, chongqing power network modulates not only network frequency but also the power of chuan yu - the middle china network alliance line
伴隨著電力體制改革的推進,重慶電網即將併入華中電網,按照國家電力調度通信中心頒發的考核辦法,重慶電網既要承擔調整電網頻率的任務,又要承擔調整川渝?華中電網聯絡線功率的任務。The services of electric power communication network have already expanded from telephone scheduling and transmitting data in low speed to digital user ' s service with high speed and great capacity, such as computer internet, wide area network and video transmission, etc. its structure has already developed from simple star topology, which is used to serve schedular center, to today ' s multicenter network to assure that the network can serve the requirement of increasing transmission of electric power information
電力通信網的業務已從調度電話、低速率遠動數據傳送擴展到高速、數字化、大容量的用戶業務,例如計算機網際網路、廣域網、視頻傳送等。電力通信網的結構也已從單一服務于調度中心的簡單星形方式發展到今天多中心的網狀網路,以保證能為日益增長的電力信息傳輸需求服務。The radar which is embedded on platform sidelooking, but the platform will be disturbed by airflow inevitably. so, the radar will have a small sloping angle, thereby, the doppler centroid that is not zero and doppler frequency rate need to be estimated from the raw echo data in order to focus in azimuth commendably
場景成像的合成孔徑雷達一般是正側視放置,但是載機不可避免的要受到各種擾動影響,雷達會有一定的斜視角,從而導致了多普勒中心頻率不為零,多普勒調頻斜率也隨著雷達斜視角改變。Generating lfm / nlfm signals whose intermediate frequency is 28mhz and bandwidth is 3mhz and 5mhz and time width is from 6us to 300us based on dds has been discussed in this dissertation. the conclusion is that the wave quality of lfm signal generating through dds is satisfactory and that of nlfm is not perfect
本文基於器件dds對產生中心頻率為28mhz 、帶寬為3mhz和5mhz 、時寬從6us到300us的不同時寬和帶寬的線性和非線性調頻信號方面進行了探討,得出了dds產生線性調頻信號( lfm )的波形質量可取得滿意的結果,但對產生非線性調頻信號( nlfm )的波形質量卻存在不足。And the waveform of the transmitted signals was designed based on the target distance ( 5 ~ 50m ). the waveform is triangular fmcw with central frequency at 6ghz, modulation bandwidth 100mhz, modulation period 10 s, step frequency 0. 2mhz, and step time 10ns
在此基礎上,設計發射信號波形參數為三角形調頻連續波,中心頻率6ghz ,調制帶寬100mhz ,調制周期10 s ,步進頻率0 . 2mhz ,步進時間10ns 。At the doppler centroid aspect, this paper make use of maximum value method ; energy method and autocorrelation function method to estimate doppler centroid. at the doppler frequency aspect, this paper make use of image offset method ; time - frequency method ; minimum entropy and fractional fourier transformation method to estimate doppler frequency rate
在多普勒參數估計中,採用了最大值法、能量法和自相關函數法進行多普勒中心頻率估計;採用了圖像偏移法、時頻分析法、最小熵法和分數階傅里葉變換法進行多普勒調頻斜率估計。This method offers more precise geometry for spaceborne sar system design and simulation. 3. in the analyzing on the radar doppler properties, under the ellipsoid earth model and ellipse orbit model, considering the earth rotation, the radar doppler properties with different orbit eccentricity are compared, and the fact that orbit eccentricity affects doppler frequency rate is found
在雷達多普勒特性分析中,論文採用橢球地球模型和橢圓軌道模型,結合地球的自轉,通過不同偏心率下雷達多普勒特性的比較,研究了軌道偏心率對合成孔徑雷達系統設計與模擬軟體研究雷達多普勒調頻斜率的影響。The thesis firstly addresses the real - time performance of spectral zoom analysis algorithms. complex modulation based zoom algorithm is a classical one of such algorithms, in which samples are modulated, decimated, filtered, spectrally analyzed and re - sorted
在這種演算法里,對長采樣數據復調制,把欲分析的頻段的中心頻率移到零頻點,然後重采樣、低通濾波得到欲分析的頻段,再做fft分析。In the third chapter, a methodologies to realize second - order band - pass filter with which center frequency tuned in a wide range using mcdi ( multiple output current - mode differential integrator ), these two kinds of mcdi are composed of pmos and nmos input transistors respectively, lastly we compare these two integrators " merits and disadvantages
第三章:提出了輸入級分別為pmos管、 nmos管的多輸出端電流模式全差分積分器,並由此構成了中心頻率連續可調的二階帶通濾波器,同時比較了二者的優缺點。Based on the experience, this thesis adopts pll to realize wireless video transmission, which can stabilize the center frequency, reduce the frequency offset and enhance the stabilization of system
在總結經驗的基礎上,本文採用了鎖相環調頻來實現無線視頻傳輸的方法,以穩定中心頻率,減少頻偏,增加系統的穩定性。Abstract : since piezoelectric resonant filter can not effectively prohibit higher - frequency harmonic, the mechanism of this problem has been discussed by means of a specific example which shows that there exists lots of undesirable resonant frequencies of piezoelectric that would let pass undesirable signals. to solve this problem , an ameliorated electrostatic mechanical resonant filter is proposed and a specific case is demonstrated. the example of electrostatic resonant micro - bridge asserts that by adjusting the gap of exciting capacitance the higher - frequency vibrating model of micro - bridge cannot be excited based on orthogonal character of intrinsic vibrating shape of micro - bridge, so that this kind of resonant filter can effectively filter out undesirable higher - frequency harmonic
文摘:提出壓電諧振濾波器不能很好地濾除高頻諧波的問題,結合一個具體例子理論推導了壓電諧振濾波器存在許多干擾諧振頻率,從而不能有效濾除一些特定頻率的干擾信號.為了解決這個問題,提出一種改進型的靜電激勵諧振濾波器.為了說明其可行性,具體分析了改進型雙端固支微梁靜電激勵諧振濾波器,理論推導證實基於雙端固支微梁的各階振型正交的原理,通過適當調整激振電容的間距,雙端固支微梁的高階振動模態受到很好的抑制,因此這種諧振濾波器可以有效阻止濾波器中心頻率的高頻諧波的通過After analyzing the theory of mtdi and setting up the model of moving target echoes, the dissertation discusses in detail the effect of moving target doppler center frequency and doppler rate on the conventional sar image. it also analyzes detailedly the range migration of moving target from time field and frequency field and provides migration model in both fields. after that, it divides algorithms of mtdi into several classes, analyzes the influence of signal - to - noise on the detection results and gives the flow chart of moving target imaging processing
本文的主要貢獻包括: 1 、建立了運動目標回波散射模型,深入探討了進行常規sar成像時,動目標的多普勒中心頻率和調頻率對動目標圖像造成的影響;從時域和頻域兩方面詳細分析了由於目標運動造成的距離徙動效應,建立了距離徙動模型;然後研究了動目標檢測原理,並對現有的檢測方法進行分類,使之更加系統化;詳細分析了動目標信噪比對檢測結果的影響,給出了sar系統動目標成像流程圖,指出了動目標成像中的關鍵環節。In the fifth chapter, the performance of transconductor - capacitor ( gm - c ) continuous time filter is discussed. due to process variation and parasitics, an automatic tuning is designed for center frequency and quality factor q. also, in this chapter, a two order bandpass filter with tunable is designed. the effects on filter ' s performance of the non - idealities of a cmos ota are studied and the computer simulations at the mos transistor level are carried out
第五章討論了跨導電容連續時間濾波器的性能特點,設計了一個中心頻率可調的二階帶通濾波器,為了使濾波器參數自動調整到設計標準值,從而保持其設計值的實現精度,論文給出了片內自校正(可調諧)環節。Except, the error model of orthogonal modulation and double frequency technology were studied. third, the design and implementation of ultra wide band lfm generator were studied. an ultra wide band lfm pulse compression signal generator with 400mhz carrier and 300mhz absolute bandwidth was developed successful
?第三部分在理論分析的基礎上對超寬帶lfm信號源系統的設計和實現技術進行研究,成功研製出了中心頻率為400mhz ,帶寬為300mhz ,重復頻率為1khz ,脈寬為20 s的線性調頻信號。This thesis introduced the basic concept of the current - mode circuit and the basic theories of the filter first, then from the principle and the port characteristic of ( ccii ) the second generation current conveyor, analysis in recent years newly arisen of the current - mode filter the basic theories and domestic and international research circumstance carried on concretly, finally with the modified second generation current conveyors : the mddccii 、 fbccii 、 ftfn 、 fbftfnt and cdba etc. of the type with the
實驗主要是利用pspice軟體對所設計的濾波器進行模擬,設計過程中分析了各種濾波器的中心頻率和品質因數,其中參數獨立可調是這些濾波器的主要優點,另外對其靈敏度特性和部分器件的非理想特性也進行了分析,模擬結果都符合濾波器的設計要求。分享友人