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

Inter-satellite hyperlink (ISL) performs an important function in present and future World Navigation Satellite tv for pc System (GNSS). A current research, 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 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 Know-how (CAST).

Moreover, the sun-elongation angle dependent systematic error in SLR residuals practically 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 photo voltaic radiation strain (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 course.

This confirms that the deficiency of the SRP fashions for BDS-3 CAST satellites will be compensated by utilizing higher statement geometry from ISL knowledge. 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, probably as a result of the affect generated by the satellite tv for pc bus can’t be fully absorbed by the B-direction parameters.

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