Manual Interphase CHART MASTER V6 (page 13 of 89) (English)

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User Manual

2. In this receiving process, the GPS receiver measures very accurate

distances to the satellites, using the "Spread Spectrum Modulation"

method. Excellence in GPS's position-fixing accuracy is mainly due to

this technology.

3. When the satellite locations and their distances are known, the GPS

receiver fixes its own position by triangulation:

Fig. 1.3a - The GPS position calculation

As illustrated in the previous figure, the position is calculated as the meeting point

of three spheres which are drawn around the three satellites with diameters d1,

d2 and d3.

Position Fixing Accuracy: HDOP

The GPS fix accuracy is due to the locations of 3 satellites in the sky. High accu-

racy is obtainable when the satellites are widely scattered in the sky; on the

contrary, accuracy is reduced when the satellites have gathered in a narrow space.

In the following figure, in both cases it is possible to obtain the GPS fix, but in the

left case the accuracy will be higher than the right:

Fig. 1.3b - HDOP

The index for position-fixing accuracy is called HDOP ("Horizontal Dilution Of Pre-

cision", see also Chapter 7 for the HDOP definition).

The HDOP value indicates higher position accuracy. Ranges of 1.0 to 1.2 provide

the highest degree of accuracy. Higher values indicate less position accuracy. This

is due to the satellites being gathered in a narrow space. Satellites which are

widely scattered in the sky produce the highest degree of accuracy.

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Interphase CHART MASTER V6 Manual

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