Signal-in-Space and Positioning Performance of BDS Open Augmentation Service

Table 4

Estimation strategy of precise positioning receiver based on BDS PPP-B2b.

Parameters	Model
Observations	UD IF carrier-phase + pseudorange
	BDS-3: B1I + B3I
	GPS: L1 + L2
	Interval: 30 s
	Elevation mask: 10°
Prior information	Pseudorange 1.0 m; carrier-phase 0.02 cycles
Observation weight	p = 1, elevation >30°
	p = 2sin (elevation), elevation ≤30° [31]
Ocean tides	IERS conventions 2003
Earth solid tides
Phase wind-up	Correction [32]
Relativistic effects	Correction
Adjustment method	Square-root information filter [4]
Receiver clock offset	Estimated as white noise
Ambiguity	Float
Troposphere delay	Saastamoinen + GMF
	Single epoch random-walk process
ISB	Estimated as random-walk process [5]