Global Positioning System Reference
In-Depth Information
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Easting (10m divisions)
Figure 9.22
GPS performance in severe urban canyon (Chicago).
auxiliary sensors listed in Figure 9.18 should ensure complete position coverage, as
well as improve navigation accuracy and reduce susceptibility to gross positioning
errors—these issues are discussed further in the following sections.
Only one factor is as important in system design as performance: cost. The over-
all cost of the system impacts market adoption, and then once the systems are made
in high volume, every dollar saved in system cost represents a large improvement in
profitability. The total annual volume of navigation and telematics systems is in the
millions of devices, and the cost of the GPS components is dropping below $10 per
unit. There is a natural reluctance among equipment manufacturers to include
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