The impact of inter-satellite links on the ECOM model performance for BDS‑3 MEO satellites

Inter-satellite hyperlink (ISL) performs an important function in present and future International Navigation Satellite tv for pc System (GNSS). A recent study, carried out by Wuhan College’s GNSS Analysis Middle and revealed in Satellite tv for pc Navigation in Could 2024, explored the numerous impact of ISL knowledge on the orbital traits of the BDS-3 MEO satellites.

From the exterior high quality evaluation, ISL considerably enhances the reliability of the orbit of MEO satellites manufactured by the China Academy of Area Expertise (CAST).

Moreover, the sun-elongation angle dependent systematic error in SLR residuals almost vanishes based mostly on the diminished 5-parameter ECOM (ECOM1) or prolonged 7-parameter ECOM (ECOM2) with ISL knowledge. It’s because the ISL reduces the correlation between state parameters and solar radiation stress (SRP) parameters in addition to these amongst SRP parameters, resulting in a extra correct estimation of each orbit and SRP perturbations, notably these alongside B path.

This confirms that the deficiency of the SRP fashions for BDS-3 CAST satellites could be compensated through the use of higher commentary geometry from ISL knowledge. Then again, for the satellite manufactured by Shanghai Engineering Middle for Microsatellites (SECM), the ISL permits for a extra correct estimation of the Bc1 parameter within the ECOM1 mannequin. This solely reduces linear systematic error, probably as a result of the affect generated by the satellite bus can’t be fully absorbed by the B-direction parameters.

This examine offers a brand new perspective to view the SRP perturbation. Contemplating that future GNSS constellations will encompass LEO satellites and optical ISLs shall be used, extra correct dynamic fashions and contribution from higher geometry could be anticipated.