Abstract:i. I N T R O D U C T I O N . Navigation aids in use today have their origin in mainly military operational requirements for navigation accuracy, coverage and integrity. They have also been directed at the needs of air and sea operations.Within the next few years, satellite systems with global coverage will add significantly to our navigation capability. Furthermore, there is a rapidly developing civil market for land vehicle location and navigation which by the end of the century could more than surpass in num… Show more
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