GPS BACKGROUND

Question 1

what is a gps

Answer 1

global positioning system

network of satellites continuously transmitting coded info, which makes it possible to precisely identify locations on earth by measuring distance from satellites

Question 2

what effects gps reception/accuracy

Answer 2

orbital errors

multipaths

ionosphere/troposphere delay

Question 3

gps reception/accuracy

- ionosphere/troposphere delay

Answer 3

gps signals slows asit passes throu the atmosphere

uses built-in ‘model’ which calculates average amount of delay

Question 4

gps reception/accuracy

- multipaths

Answer 4

when gps signal reflected off objects such as tall build/rocks, before reaching receiver. increase travel time of signal, causing errors

Question 5

gps reception/accuracy

- orbital errors

Answer 5

also known as ephemeris errors, inaccuracies of satellite’s reported location

Question 6

morden day gpc receivers

Answer 6

parallel multi-channel designed

quick to lock onto satellites when first turned on/unequalled in ability to received satellites signals even in difficult conditions, such as dense foliage