A new paper have been published on GPS Solutions entitled: Enhanced orbit determination for formation-flying satellites through integrated single- and double-difference GPS ambiguity resolution.
For formation-flying satellites, recent studies have reported that single receiver IAR by resolving the single-difference (SD) ambiguities between GNSS satellites at each individual formation-flying satellite cannot achieve the same relative orbit accuracy that is attained by double-difference (DD) IAR between formation-flying satellites. In this study, we have found that errors in the GPS clock and/or phase bias products may partly explain the degraded relative accuracy of SD-IAR. We therefore propose an integrated IAR scheme for formation flying satellites to enhance the orbit solutions. In the proposed integrated IAR scheme, SD-IAR is performed only at the reference formation-flying satellite, while DD-IAR is further accomplished between formation-flying satellites. To demonstrate the added value of the proposed IAR scheme, GPS data collected by the GRACE mission have been used. Our results have showed that the integrated IAR-SD-DD scheme is able to provide the best absolute and relative orbit accuracies simultaneously.
For more details, please refer to the paper：
Guo, X., Geng, J., Chen, X. et al. (2020) Enhanced orbit determination for formation-flying satellites through integrated single- and double-difference GPS ambiguity resolution. GPS Solut: 24: 14. https://doi.org/10.1007/s10291-019-0932-1
Fig. 1 SLR residuals for GRACE kinematic orbits derived from different AR schemes
Fig. 2 Daily STDs of the KBR residuals for the dynamic (top) and kinematic (bottom) orbits derived from different AR schemes
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