Two-Step Galileo E1 CBOC Tracking Algorithm: When Reliability and Robustness Are Keys!

Table 2

Two-step tracking scheme description for the front-end bandwidth of 18 MHz.

Two-step tracking technique
Parameters	Coarse tracking	Fine tracking (pilot channel)	Fine tracking (data channel)
E-L spacing	[−1/2;−1/4;0;1/4;1/2]	[−1/2;−1/24;0;1/24;1/2]	[−1/2;−1/24;0;1/24;1/2]
Discriminator type	VEMLP	DP/HRC	DP
Loop filter BW	2 Hz	1 Hz	1 Hz
False lock detector	Embedded	Bump-jump	Bump-jump
Carrier aiding	No	Yes	Yes
Advantage	Unambiguous	Accurate multipath gain	Accurate
Disadvantage	Noise and MP increased	Ambiguous	Ambiguous