Table 2 Characteristics of the BDS PPP models
From: PPP models and performances from single- to quad-frequency BDS observations
Models | Signals | e1 | e2 | e3 | e4 | Ion. | Noise amplifications |
|---|---|---|---|---|---|---|---|
SF1 | B1I | 1 | 0 | 0 | 0 | 1 | 1 |
SF2 | B1I | 1/2 | 0 | 0 | 0 | 0 | 1/4 |
SF3 | B1I | 1 | 0 | 0 | 0 | 1 | 1 |
DF1 | B1I | 1 | 0 | 0 | 0 | 1 | 1 |
B3I | 0 | 1 | 0 | 0 | 1 | 1 | |
DF2 | B1I/B3I | 2.944 | − 1.944 | 0 | 0 | 0 | 3.528 |
DF3 | B1I | 1/2 | 0 | 0 | 0 | 0 | 1/4 |
B3I | 1/2 | 0 | 0 | 0 | 0 | 1/4 | |
B1I/B3I | 2.944 | − 1.944 | 0 | 0 | 0 | 3.528 | |
DF4 | B1I | 1 | 0 | 0 | 0 | 1 | 1 |
B3I | 0 | 1 | 0 | 0 | 1 | 1 | |
TF1 | B1I | 1 | 0 | 0 | 0 | 1 | 1 |
B3I | 0 | 1 | 0 | 0 | 1.514 | 1 | |
B2a | 0 | 0 | 1 | 0 | 1.761 | 1 | |
TF2 | B1I/B3I | 2.944 | − 1.944 | 0 | 0 | 0 | 3.528 |
B1I/B2a | 2.314 | 0 | − 1.314 | 0 | 0 | 2.662 | |
TF3 | B1I/B3I/B2a | 2.343 | − 0.089 | − 1.254 | 0 | 0 | 2.659 |
B1I/B3I | 2.944 | − 1.944 | 0 | 0 | 0 | 3.528 | |
TF4 | B1I | 1 | 0 | 0 | 0 | 1 | 1 |
B3I | 0 | 1 | 0 | 0 | 1.514 | 1 | |
B2a | 0 | 0 | 1 | 0 | 1.761 | 1 | |
QF1 | B1I | 1 | 0 | 0 | 0 | 1 | 1 |
B3I | 0 | 1 | 0 | 0 | 1.514 | 1 | |
B1C | 0 | 0 | 1 | 0 | 0.982 | 1 | |
B2a | 0 | 0 | 0 | 1 | 1.761 | 1 | |
QF2 | B1I/B3I | 2.944 | − 1.944 | 0 | 0 | 0 | 3.528 |
B1C/B2a | 0 | 0 | 2.261 | − 1.261 | 0 | 2.588 | |
QF3 | B1I/B3I/B1C/B2a | 1.171 | − 0.336 | 1.224 | − 1.058 | 0 | 2.025 |
B1I/B3I | 2.944 | − 1.944 | 0 | 0 | 0 | 3.528 | |
QF4 | B1I | 1 | 0 | 0 | 0 | 1 | 1 |
B3I | 0 | 1 | 0 | 0 | 1.514 | 1 | |
B1C | 0 | 0 | 1 | 0 | 0.982 | 1 | |
B2a | 0 | 0 | 0 | 1 | 1.761 | 1 |