positioning signal 中文意思是什麼
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The new positioning system which employs three geostationary satellites emitting radio signals to users just like the gps satellites do, and allows the users receiver to solve position based on the received radio signal as well as the reading of electronic map, the drawbacks of double - star navigation system are overcome
三顆同步導航衛星像gps衛星那樣向用戶播發導航電文，用戶接收機根據這些導航電文信息以及電子地圖高程數據，像gps接收機那樣解算用戶位置，從而克服了雙星定位的兩大缺陷。 -
In satellite navigation and positioning system, time is important information for fast and direct acquisition of long cycle code, one of its important aspects is the uncertainty compression of signal ' s propagation delay to reduce time search range
摘要衛星導航定位系統中，輔助長碼快捕的一個最重要的信息是時間信息，衛星信號傳播時延估計是提供先驗時間信息，減少時域搜索范圍的一個重要方面。 -
In spread - spectrum communication positioning system, the multi - path signal is always existing and unable to be eliminated. how to extracting its multi - path rapidly and real - timely is one of the key techniques in mobile communication positioning system
在擴頻通信定位系統中，多徑信號是一個普遍存在而又難以消除的干擾，如何實時有效的估計和提取多徑干擾分量是提高移動通信定位精度的關鍵技術之一。 -
As well as the stepping motor, pulsating wave signal is used to control directly so as to fulfill the speed control and positioning rolling with
與步進馬達相同可用脈波信號來直接控制，故可簡單完成高精度之速度控制及定位運轉。 -
Active underwater acoustic positioning / tracking systems locate target by measuring the range from object to receiving sensors. usually the target - receiver range can be got by the propagating time of a signal pulse. if this propagating time is larger than the pulse repetition period, it will mean that more than one signal pulse are on propagation
主動水聲跟蹤定位系統通過測量脈沖信號的傳播時延可以測得目標相對接收機的距離，當此傳播時延大於系統同步周期時，時延測量就會呈現不確定性，可能相差若干個重復周期，導致定位解多值，稱之距離模糊現象。 -
Some gps receiver are more susceptible to positioning signal strength variations than others
某些gps接收器對定位信號的強度變化比較敏感。 -
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。 -
Multi - beam sounding system ( mbss ) is a high - density integration of modern signal processing, computer application, high precision navigation and positioning and other technologies
多波束測深系統是現代信號處理技術、計算機技術、高精度導航定位技術等多種技術的高度集成。 -
By computer sampling the long periodic sequence and estimate the confidence interval, we can conclude the cross correlation value of long periodic sequence is biger than 0. 03 with a probability lower than 10 - 7. this thesis also presents a new quick acquisition method of long periodic non - linear codes used in the satellite navigation and positioning signal ( snps )
通過計算機采樣數據和區間估計，對于超長偽隨機序列可以以99 . 99的概率確信，在2048相關長度的條件下，長碼的局部互相關值超過0 . 03的概率低於10 ~ （ - 7 ）數量級。 -
With the development of acoustics and signal processing theory, as well as that of dsp and dgps technology, it is possible for us to develop more advanced positioning systems
聲學、信號處理理論逐步成熟；電子技術，如dsp 、 dgps技術的發展，為我們提供了開發更先進的定位系統的可能。
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