Table 1 Comparison of different public providers of products to enable PPP-AR
From: An assessment of the interoperability of PPP-AR network products
Fractional Cycle Bias (FCB) model | Decoupled Clock (DC) model | Integer Recovery Clock (IRC) model | ||||||
|---|---|---|---|---|---|---|---|---|
Combined (GRG) | Uncombined (CNT) | |||||||
PPP-AR Products | \( d{\tilde{t}}_{IF}^{ps} \) \( {\tilde{a}}_{q, WN}^{ps} \) \( {\tilde{a}}_{q,1}^{ps} \) | - code clock - wide lane - narrow lane | \( \delta {\tilde{t}}_{IF}^{ps} \) \( d{\tilde{t}}_{IF}^{ps} \) \( {\tilde{\delta}}_{WN}^{ps} \) | - phase clock - code clock - wide lane clock | \( \delta {\tilde{t}}_{IF}^{ps} \) | - phase clock | \( d{\tilde{t}}_{IF}^{ps} \) \( {\tilde{\delta}}_{,i}^{ps} \) \( {\tilde{d}}_{,i}^{ps} \) | - code clock - phase equipment delay - code equipment delay |
\( {\tilde{\delta}}_{WN}^{ps} \) | - wide lane clock | |||||||
Provided product units | \( d{\tilde{t}}_{IF}^{ps} \) \( {\tilde{a}}_{q, WN}^{ps} \) \( {\tilde{a}}_{q,1}^{ps} \) | - seconds - cycles - cycles | \( \delta {\tilde{t}}_{IF}^{ps} \) \( \delta {\tilde{t}}_{IF}^{ps}-d{\tilde{t}}_{IF}^{ps} \) \( {\tilde{\delta}}_{WN}^{ps} \) | - seconds - nanoseconds - nanoseconds | \( \delta {\tilde{t}}_{IF}^{ps} \) \( {\tilde{\delta}}_{WN}^{ps} \) | - seconds - cycles | \( d{\tilde{t}}_{IF}^{ps} \) \( {\tilde{\delta}}_{,i}^{ps} \) \( {\tilde{d}}_{,i}^{ps} \) | - seconds - nanoseconds - nanoseconds |
Data rate | \( d{\tilde{t}}^{ps} \) \( {\tilde{a}}_{q,1}^{ps} \) \( {\tilde{a}}_{q, WN}^{ps} \) | - 30 s - 15 min - daily | \( \delta {\tilde{t}}_{IF}^{ps} \) \( d{\tilde{t}}^{ps} \) \( {\tilde{\delta}}_{WN}^{ps} \) | - 30 s - 30 s - 30 s | \( \delta {\tilde{t}}_{IF}^{ps} \) | - 30 s | \( d{\tilde{t}}^{ps} \) \( {\tilde{\delta}}_{,i}^{ps} \) \( {\tilde{d}}_{,i}^{ps} \) | - 5 s - 5 s - 5 s |
\( {\tilde{\delta}}_{WN}^{ps} \) | - daily | |||||||
General assumptions | Constant \( {\tilde{a}}_{q,W}^{ps} \) are estimated daily by averaging arc-dependent estimates. | No constraints or smoothing applied. | \( \delta {\tilde{t}}_{IF}^{ps} \)aligned to the satellite pseudorange clocks within a narrow lane cycle. \( {\tilde{\delta}}_{WN}^{ps} \) represents a daily average | \( {\tilde{\delta}}_{WN}^{ps} \) estimated as unconstrained in the network work solution with white noise added at each epoch. | ||||
Products used | Post-processed | Post-processed | Post-processed | Archived real-time | ||||
Network solution | Global. IGS final products | Global. EMR rapid products | Global. GRG final products | Global. GRG ultra-rapid products | ||||
PPP user model | \( \Delta {p}_{u, IF}^{ps},\Delta {\phi}_{u, IF}^{ps},\Delta {p}_{u, NL}^{ps},\Delta {\phi}_{u, WL}^{ps} \) or \( \Delta {p}_{u, IF}^{ps},\Delta {\phi}_{u, IF}^{ps},\Delta {\phi}_{u, WN}^{ps} \) | User defined | ||||||
P1, P2 correction | \( {\tilde{d}}_{,i}^{ps} \) | |||||||
L1, L2 correction | \( {\tilde{\delta}}_{,i}^{ps} \) | |||||||
NL correction | \( {\tilde{a}}_{q,1}^{ps} \) | |||||||
WL correction | \( {\tilde{a}}_{q, WN}^{ps} \) | \( {\tilde{\delta}}_{WN}^{ps} \) | \( {\tilde{\delta}}_{WN}^{ps} \) | |||||