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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.

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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.

句子翻译（手写并拍照上传）：Survey grade receivers are the most accurate, capable of centimeter or even millimeter accuracy, depending on the equipment, but they use more advanced techniques to achieve this level of accuracy and, naturally, are more expensive.