Multipath Mitigation Techniques for Satellite-Based Positioning Applications - Global Navigation Satellite Systems: Signal,Theory and Applications - page 410

Correlation shapes in two path static channel

1

BPSK
CBOC(+)
CBOC(−)

0.8

0.6

0.4

0.2

0

−1 −0.5 0 0.5 1

Code Delay [chips]

Fig. 3. Non-coherent correlation functions for different signal modulations in two path static
channel.

Correlation shapes for different front−end bandwidths

1

16 MHz
8 MHz
4 MHz
2 MHz

0.8

0.6

0.4

0.2

0

−1 −0.5 0 0.5 1

Code Delay [chips]

Fig. 4. Non-coherent correlation functions for BPSK modulated GPS L1 C/A signal in
different front-end bandwidths.

relation: the more the bandwidth, the smaller the correlator spacing. As mentioned in Betz
& Kolodziejski (2000), the early-late spacing

Δ EL (i.e., twice the correlator spacing) is related
to the front-end bandwidth (double-sided) BW and the code chip rate f chip according to the
following equation:

f chip
BW

Δ EL ≥ (1)

The type of the discriminator and the correlator spacing used to form the discriminator
function (i.e., nEML, HRC, SC, etc.) determines the behavior of the code discriminator that