Estimation of New B1C/B2a Signals Precision Satellite Products of BDS-3 and Study of PPP-AR Performance
To analyze the service performance of the Beidou Navigation Satellite System(BDS)new signal(BIC/B2a),the precise clock offset of BDS-3 is solved by combining data of global uniformly distributed observation stations based on the mixed-difference method,and the wide lane and narrow lane Uncalibrated Phase Delay(UPD)is further estimated.The accuracy of estimated BDS-3 clock offset is evaluated and analyzed by using the quadratic difference method to illustrate the precision of the estimated clock product.The stability of the UPD product is investigated by their long-term series.Finally,the estimated products are applied to the Precise Point Positioning(PPP)and Precise Point Positioning-Ambiguity Resolution(PPP-AR)for validation.According to the data processing results,the average accuracy of the estimated satellite clock offset for Geosynchronous Earth Orbit(GEO),Inclined Geosynchronous Satellite Orbit(IGSO)and Medium Earth Orbit(MEO)orbit are 0.209,0.095,0.087 ns,respectively.The Standard Deviation(STD)of the long-term sequences of BDS-3 wide lane UPD is within 0.04 cycles.The maximum variation of BDS-3 narrow lane UPD within one day does not exceed 0.15 cycles.The stability of BDS-2 wide and narrow lane UPD is slightly worse than that of BDS-3.The average positioning accuracy of the PPP float solutions for the uniformly selected stations in global is 2.21,3.50,6.01 cm in the direction of North(N),East(E),and Up(U),respectively,and the fixed solutions are improved to 1.11,1.26,3.50 cm after the ambiguity is fixed,which is improved by 49.8％,64.0％,and 41.8％,respectively,verifying the correct estimation method of the clock offset and UPD with good service performance of the BDS-3 new signal.
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