The affect of inter-satellite hyperlinks on the ECOM mannequin efficiency for BDS‑3 MEO satellites

Inter-satellite hyperlink (ISL) performs an important position in present and future International Navigation Satellite tv for pc System (GNSS). A recent study, performed by Wuhan College’s GNSS Analysis Middle and revealed in Satellite tv for pc Navigation in Might 2024, explored the numerous impact of ISL information 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 practically vanishes based mostly on the lowered 5-parameter ECOM (ECOM1) or prolonged 7-parameter ECOM (ECOM2) with ISL information. It’s because the ISL reduces the correlation between state parameters and photo voltaic 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 remark geometry from ISL information. Then again, for the satellite tv for pc 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, presumably as a result of the affect generated by the satellite tv for pc bus can’t be solely absorbed by the B-direction parameters.

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