北斗三频非组合精密单点定位频间钟偏差改正比较分析OA

Addressing the issue that the traditional precise clock offset products cannot be directly used for the third frequency of BDS triple-frequency uncombined precise point positioning(PPP)phase observations,this paper calculated the inter frequency clock bias(IFCB)using BDS-2 stations in the Asia Pacific region and BDS-3 stations in the global region and analyzed their time characteristics.Meanwhile,the positioning results of BDS triple-frequency uncombined PPP corrected using the calculated IFCBs and CNES Bias products were compared.The results indicate that the magnitude of IFCB of BDS-2 is within 3 cm,and the magnitude of IFCB of BDS-3 is within 2 cm.Compared with no IFCB correction,the 3D positioning accuracy of BDS-2 triple-frequency uncombined PPP improved by 14.07%when using IFCB correction,and the posterior phase residual was reduced by 8.82%.However,the BDS-2 triple-frequency uncombined PPP corrected by CNES's Bias product is getting worse in both positioning accuracy(4.94%reduction)and posterior phase residual(2.94%increase).The improvement effect of BDS-3 triple-frequency uncombined PPP positioning accuracy corrected by CNES's Bias product(23.02%)is better than that corrected by IFCB product(5.28%),and the posterior phase residual of the two correction methods is basically equivalent to that without correction.