This paper examines geometric and error sensitivity problems, centering on the range-differencing scheme. A hypothetical (though realistic in terms of satisfying most civilian and military needs) set of navigation-system operational requirements has been postulated. Results indicate that about 16 satellites (3 out of 4 in inclined orbits) will be required to satisfy both applications. Recommendations for additional research using range-rate information are made. 38 pp. Ref.
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