The radio wave refraction correction for improving the accuracy of radio location in necessary.
因此要提高无线电定位的精度，就必须进行电波折射修正。
The radio wave refraction correction for improving the accuracy of GPS navigation and location is necessary.
因此要提高GPS的定位导航精度，就必须进行电波折射修正。
The refraction error is produced. The radio wave refraction correction for improving the accuracy of GPS navigation and location is necessary.
因此要提高GPS的定位导航精度，就必须进行电波折射误差修正。
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