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WSEAS TRANSACTIONS on ELECTRONICS

Figure 4. Receiver position error without using extension controller.

Figure 5. Time difference between GPS receiver and satellite without using extension controller.

Utilizing the extension theory to design the extension controller, the relational function is defined via adjusting the GPS receiver oscillation frequency to synchronize with the atomic clock oscillation frequency. Position precision can be improved from 3.5 meters to 1.5 meters after using the extension controller, as shown in Figure 6. The time error is improved from 4 .8 5 × 1 0 7 seconds to

2 .8 5 × 1 0 8 controller.

seconds after It is obvious

using the extension that the accuracy is

improved by about 17 times, as shown in Figure 7.

ISSN: 1109-9445

155

Guo-Shing Huang

Figure 6. The position error using extension controller.

Figure 7. Time difference between GPS receiver and satellite using extension controller.

The neural network extension distance idea is used in cooperation with adjusting the weighting factor of the neural network to synchronize the receiver oscillation frequency with the oscillation frequency of the reference atomic clock. Position precision can be improved from 3.5 meters to 1.4 meters after using the extension neural network, as shown in Figure 8. The time error is improved from 4 .8 5 × 1 0 7 seconds to 3 × 1 0 8 seconds after using the extension neural network. The accuracy is improved by about 16 times, as shown in Figure 9.

Issue 7, Volume 4, July 2007

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