Interference, Multipath, and Scintillation - Understanding GPS: Principles and Applications - page 289

15

1.5 10

5

1

0

− 1 − 5

0.5

− 15

0

− 1 − 0.5

0 0.5 1 0 200 400 600 800 1000

Delay (microseconds) Early-late spacing (microseconds)

15

1.5 10

5

1

0

− 1 − 5

0.5

− 15

0

− 1 − 0.5

0 0.5 1 0 200 400 600 800 1000

Delay (microseconds) Early-late spacing (microseconds)

15

1.5 10

5

1

0

− 1 − 5

0.5

− 15

0

− 1 − 0.5 0 0.5 1 0 200 400 600 800 1000

Delay (microseconds) Early-late spacing (microseconds)

15

1.5 10

5

1

0

− 1 − 5

0.5

− 15

0

− 1 − 0.5 0 0.5 1 0 200 400 600 800 1000

Delay (microseconds) Early-late spacing (microseconds)

Figure 6.12 Effects of one-path multipath on pseudorange estimation, BPSK-R(10) modulation strictly
bandlimited to 24 MHz. Top row shows no multipath, while in subsequent rows MDR is -10 dB and excess
delay is 0.1 µ s, and phase is 0º, 90º, and 180°. Left-hand column shows distorted correlation functions,
while right-hand column shows dependence of range error on early-late spacing.

sin ~

~ ~

( )

αφ τ R −− τ τ

1 1 x 0 1

ψ = tan

− 1

(6.48)

cos ~

~ ~

( ) ( )

R ττ −+ α φ R ττ −− τ 1

x 0 1 1 x 0