time signal service 中文意思是什麼
time signal service
解釋
報時服務-
Standard frequency and time signal - satellite service
衛星標準頻時信號業務 -
Setup functions enable user - defined adaptation of a wide variety of options such as display contrast, record printout, saving data on the computer, general code, temperature calibration, acoustic signal, date and time, id, data transfer, update fix programs, language, c f changeover, check program, battery change, diagnosis data, printing programs, seal test, service functions for maintenance
設置功能允許使用人員對多種選項進行定義和調節，例如顯示屏幕對比度列印記錄把數據記錄到計算機上總碼溫度校正音響信號日期和時間識別傳輸數據固定程序升級語言攝氏和華氏溫度轉換檢查程序更換電池診斷數據列印程序測試密封保養用服務功能。 -
Setup functions enable user - defined adaptation of a wide variety of options such as display contrast, record printout, saving data on the computer, general code, temperature calibration, acoustic signal, date and time, id, data transfer, update fix programs, language, screen saver, c f changeover, check programme, battery change, diagnosis data, printing programs, seal test, service functions for maintenance
設置功能允許使用人員對多種選項進行定義和調節，例如顯示屏幕對比度列印記錄把數據記錄到計算機上總碼溫度校正音響信號日期和時間識別傳輸數據固定程序升級語言屏幕保護攝氏和華氏溫度轉換檢查程序更換電池診斷數據列印程序測試密封保養用服務功能 -
This system ' s hardware adopts dsp - embedded controller, which can process digital signal independently. the controller communicates with pc by accessing memory. on the side of controller, c language is used to write the interpolation program and the interruption service program, while on the side of pc, visual c + + is used to write programs in which functions of editing nc - code, real - time control and human - machine interaction interface is fulfilled
該數控系統的硬體採用了具有獨立數字信號處理功能的dsp型運動控制器，控制器通過內存訪問與pc機通信，使用c語言編寫了控制器端的中斷服務和插補程序，使用visualc + +編寫了pc端的數控代碼編輯、實時控制和人機交互界面程序。 -
In order to meet to the higher timing precision of the low frequency time - code timing terminal, the applications of dsp ( digital signal processing technology ) in the time service is researched in this paper. the main works and contributions can be summarized as follows : ( l ) the low frequency signal transmission and dsp technology are discussed. according to the system needs, a testing flat of low frequency time - code based on dsp is built up
本論文的工作針對低頻時碼授時高端用戶的定時需求，對數字信號處理（ dsp ）這一新型技術在該領域應用進行了探索性研究，主要完成和開展了如下工作： （ 1 ）研究分析了低頻通道和dsp技術，根據系統要求，從硬體上實現了基於dsp晶元的低頻時碼信號的採集測試平臺。 -
This paper gives a time - synchronization technique bases on gps time service signal which is used in broad band seismic recorder 。 by world coordination time offered by gps - - utc ( usno ), adjust local clock base on gps signal, gain high nicety clock signal, clock precision reachs 10 - 6 。 this clock is the time source of broad band seismic recorder, bring the whole seismic recorder works in same time base. 1pps time base with high stability can be used as in - phase, spring, time and start - stop of every collection mode, while the scale under second make a precise time mark to receive data of broad band seismic recorder
針對接收機中gps信號的噪聲進行kalman濾波軟體處理， kalman濾波可以對gps信號與本地晶振時鐘的時差數據在大噪聲中進行平滑，在較短時間內估計出高精度的時差數據。系統消除了gps秒脈沖信號的ms級隨機誤差，把晶振秒脈沖的長期穩定度鎖定到gps信號的穩定度上;在gps信號失效時給出了可行措施，能夠保證在任何情況下產生一個穩定、高精度秒脈沖信號，誤差在1 s內。 -
This paper analyses crystal oscillator ’ s character and technique targets, and the changes of these technique targets effect the time of crystal oscillator gives the error mode of crystal oscillator time, by discussing gps system and time service theory, we analyze random character of gps second pulse error. we combine long - time stability of receiver ’ s output signal and short - term stability
該系統成功地應用於寬頻帶地震記錄儀中，使地震數據記錄的時基精度達到微秒級，可以解決大范圍的地震儀布設應用時的授時和空間定位（經度、緯度、海拔）問題，為地震數據記錄、分析工作提供了與國際標準時間同步的時間基準。 -
However, although gps can provide worldwide real - time positioning service, the fatal shortcoming is that the positioning precision can be reduced sharply owing to the weak satellite signal which is blocked by buildings and trees etc. fortunately, gsm / gprs network can work and provide positioning service can transmit the position messages to remote users or servers
然而， gps定位雖然能實現全球范圍內的實時定位，但是對于gps來說，其很大的一個缺點是跟蹤衛星的信號常常由於建築物及樹木等的遮擋而使gps的定位精度大大降低，甚至無法進行正常的導航和定位。而基於gsm / gprs網路的位置服務恰恰能彌補gps定位的這一缺點，並且gsm / gprs網路能將位置信息傳送到遠端。
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