How does sat nav work?

How does sat nav work?

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he Sat Nav ‘receiver is activated when it picks up the signal from atellites (of which there are 24 orbitting the Earth, each emitting continual signal unique to each individual satellite)The satellites ’triangulate’ or to use the correct terminology ‘trilaterate’ the eceiver’s location, taking into account latitudal and longitudal co-ordinates. The signal from a 4th satellite increases pinpoint accuracy aided by it’s atomic clock.

The Satellite Navigation device consists of 2 distinct elements: the software and the hardware, it is essentially just a small computer!

On activation, the receiver selects the relevant map from it’s software and the hardware utilises previously installed settings to communicate the information to the driver via a computer screen and audio instructions!!!

This is all very alien to Bob!

The unique signal emitted by the satellite is called ‘Pseudo Random Code.’ Each satellite has it’s own PSC which distinguishes it from every other satellite.

The PSC is like a song. The receiver and the satellite start playing the song at the same time. The distance causes a delay........

.....the receiver measures the delay and is able to calculate the relative distance between the satellites and itself to work out your exact whereaboots! Too Whit Too Woo!

Extreme accuracy were the signal t of a second it wou be off by a

y is very important because to be out for even 1/1000th uld cause the calculation to around 200 miles!!!

In Latin ‘navi-gare’ means to sail or steer a ship (navi) and (agere) meaning to drive.

After Bob’s little accident he has decided to cut short his fly-drive on Earth and return home!!

Bob thinks sat nav is out of this world!

Bob thinks sat nav is out of this world!

UK

DRIVING LICENCE 1 2 3 4 5 6

SMITH MR BOB 01-06-19 JUGAKU 23-11-11

11-11-19

1800 MARS RD, JUGAKU,QA15 6CB