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fixed system
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  fixed system
This research has also proposed a system design methodology to improve the schedulability of real time system with a fixed system load.
      
Our mapping tool can be easily extended for use in the more general case when the link contention-degree is bounded to a fixed system-specified value without increasing its complexity.
      
It proceeds by a series of finite approximations "from below" to a solution of a fixed system of critical formulas.
      
In particular the 'subquantum situation' determines the minimum coordinate and momentum uncertainties ((δq)2 and (δp)2) as well as the coordinate distribution of a 'fixed' system and the momentum distribution of a 'free' system.
      
Also, for fixed system size, the dynamics of individual project realizations can exhibit large deviations from the average when fluctuations increase past a threshold, causing long delays in completion times.
      
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A very-long-range radio position fixing system that may be used both above water and under water is proposed in this paper. The basic points about this system are:

本文提出一种能够兼容水上和水下的超远程无线电定位系统。这种系统的基本点在于: 1.用能给出高精度方位信息的发射台取代工作于甚低频段的奥米加系统的发射台; 2.发射台除发射方位信号外,也发射向观测者提供测定自船距发射台距离的圆信号。 如此,一个独立工作的发射台即可给出定位所需的信息。

Abstract JGD system, a highly accurate position fixing system consists of one master transmitting station, up to five secondary transmitting stations and unlimited mobil receiving stations. It can provide an accuracy of several meters up to above ten meters within a range of 150 kilometers. To reach a compatibility of survey and navigation services, the system uses one medium-high frequence wave for high accuracy and two medium-low frequencies waves for stability of day-and-night operation...

Abstract JGD system, a highly accurate position fixing system consists of one master transmitting station, up to five secondary transmitting stations and unlimited mobil receiving stations. It can provide an accuracy of several meters up to above ten meters within a range of 150 kilometers. To reach a compatibility of survey and navigation services, the system uses one medium-high frequence wave for high accuracy and two medium-low frequencies waves for stability of day-and-night operation as well as for lane identification or ambiguity resolution of the fine pattern by two super imposed coarse patterns. Among the systems of the same sort at home and abroad, JGD system was the first to adopt the new techniques of wide band limiting stages with operational amplifiers as their cores, digital phase locking, automatic lane identification circuits for error analysis and determination, and wide band linear power combination. During the first sea test around Lian Yun Harbour shew that the system was easy to operate, stable when working, accurate in loop closing and effective in lane identification. The system also successfully fulfilled the three tasks of precise position fixing in open sea survey which the Lian Yun Port Authorities were unable to do before. This was favourably commented by those concerned. On the technical meeting of appraising the JGD system managed by the Bureau of Science & Technology of the Ministry of Communications, all the attendants believed that the JGD system was a rather gratifying scientific research achievement, which has improved high accuracy position fixing technique in China.

JGD是由一主台,五副台和任意多个移动接收机所组成的能够在150公里的范围内提供几~十几米定位精度的高精度无线电定位系统.为了满足测量,导航兼容,本系统采用一中短波满足高精度需要,采用二中长波满足昼夜使用稳定性需要,同时完成对精格网的二级多值性消除.与国内外同类型系统比较,JGD首先采用了以线性组件为核心的宽带限幅放大级,数字锁相,具有误差分析与判断能力的自动巷识别电路和宽带线性功率合成等新技术.在连云港的首次海上试验中,证实了本系统操作简便,工作稳定,闭合良好,巷识别功能有效.同时还顺利地解决了连云港建港中过去所无法进行的三项外海测量作业的精密定位任务,受到了有关方面的先赞许与好评.在由交通部科技局主持的关于JGD科研评议会上,与会代表一致认为JGD系统是一项十分可喜的科研成果,把我国的高精度定位技术提高了一步,并通过了科研评议.

In this paper,on the basis of analysis for calculation accuracy obtained by formula,the reliable data from the computer (which is provided with the 540 model micro-wave position fixing system) are used to compare with those concrete calculation.It is shown that some differeces for obtanied data exist in various cases.

本文结合使用公式的计算精度分析,对540型微波定位装置配用计算机获取可靠的资料,进行了实例计算对比,表明了不同情况获取资料的差别。

 
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