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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.

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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.

句子翻译（手写并拍照上传）：Since the base station “ knows” where it is, it can compute the errors in its position calculations (in reality, it computes timing errors) and apply them to any number of roving receivers in the same general area.

句子翻译（手写并拍照上传）：It is not until you take the rover files back to the office and process them using differential correction software and data from the base station file, that you get corrected positions.

error distribution:( )正态分布:( )Gaussian distribution:( )laws of probability:( )正态随机变量:( )normal error distribution curve:( )最或然值:( )期望值:( )unbiased estimate:( )index of precision:( )方差:( )