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An Intelligent Mobile Locator hi-GPS 1000 and the Precision Assessment There are some benefits of HI-GPS1000 such as:
The experiments aimed at the performance assessment and precision estimation of HI-GPS1000 by single and differential GPS positioning in stationary and moving state respectively. (1) Continuous stationary positioning The testes were carried out at the baselines field for GPS calibration of GSI (Geographical Survey Institute, Japan). More than 2 times of this static observation testing had been done since last year. In every time, several HI-GPS1000s were used simultaneously and set up at the top of the pillars one by one for single and differential GPS positioning throughout 24 hours (Figure 1). The reference station for differential GPS was set up in Tokyo and the distance between the testing field and the reference station was about 52Km.  Figure 1. 24 hours continuous stationary positioning in Tsukuba, Japan Table 2 gives the typical results of the experimental test done in November 2003 [ (1) in Table. 2 ] and July 2004 [ (2) in Table. 2 ] respectively. In general, well precision has been obtained from these tests under the good conditions for GPS observation such as the open sky visibility and ignorable multi-path. As the result, the standard deviations of differential GPS are much smaller than that of single GPS. The positioning precision of differential GPS is about 2 times as higher as the single positioning. Moreover, the results of tests of (2) are better than (1) since some improvements of HI-GPS1000 with the most suitable configuration and reduction of noises in communication and the electric circuit. Table 2. The results of the stationary positioning in 24 hours continually
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