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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.

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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.

句子翻译（手写并拍照上传）：Another source of error is measurement noise, or distortion of the signal caused by electrical interference or errors inherent in the GPS receiver itself.