GPS（Global Position System,全球定位系統(tǒng)），全稱為NAVSTAR GPS（NAVigation Satellite Timing And Ranging Global Position System，導(dǎo)航星測(cè)時(shí)與測(cè)距全球定位系統(tǒng)）。
The precision of a measurement system, alsocalled reproducibility or repeatability, is the degree to which repeatedmeasurements under unchanged conditions show the same results. 精密則是指多次量度或計(jì)算的結(jié)果的一致程度。