How GPS Works, Multipath Error, NSIS Special Communication Solutions Consultant, Dhahran, Dammam, Alkhobar, Jeddah, Riyadh, Jubail, Saudi Arabia

Nova Stars Electronics

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Special Communication Systems

Getting Perfect Timing

Multipath Error

The whole concept of GPS relies on the idea that a GPS signal flies straight from the satellite to the receiver.

Unfortunately, in the real world the signal will also bounce around on just about everything in the local environment and get to the receiver that way too.

The result is a barrage of signals arriving at the receiver: first the direct one, then a bunch of delayed reflected ones. This creates a messy signal.

If the bounced signals are strong enough they can confuse the receiver and cause erroneous measurements.

Sophisticated receivers use a variety of signal processing tricks to make sure that they only consider the earliest arriving signals (which are the direct ones).

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