Tracking Weak Signals - Fundamentals of Global Positioning System Receivers: A Software Approach - page 299

New Track - Horizontal Error (m)

25

20

15

10

5

0

− 5

− 10

− 15

− 20

− 25

− 25 − 20 − 15 − 10 − 5 0

West -> East

5 0 5 0 5

(a) xy plane.

New Track -Verticle Error (m)

40

30

20

10

0

− 10

− 20

− 30

− 40

5 10 15 20 25

Time (sec)

(b) Altitude variation versus time.

FIGURE 11.19 User position calculated through weak signal method.