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What are the GPS Error Sources？

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句子翻译（手写并拍照上传）：The high altitude insures that the satellite orbits are stable, precise and predictable, and that the satellites’ motion through space is not affected by atmospheric drag.

句子翻译（手写并拍照上传）：The system is designed to maintain full operational capability even if two of the 24satellites fail.

句子翻译（手写并拍照上传）：The range (the range a receiver calculates is actually a pseudorange, or an estimate orange rather than a true range) or distance is measured as elapsed transit time.

句子翻译（手写并拍照上传）：This fact helps narrow the receiver location down, but it only tells us that we are somewhere on a sphere which is centered on the satellite and has a 12,000 mile radius.