Monday, 16 April 2007

GPS receiver

(Photo quated from
Galileo system
1. Europe’s own global navigation satellite system
2. It ascertains one’s precise position in space
3. European Union support
(Wikipedia)Galileo is tasked with multiple objectives including the following: to provide a higher precision to all users than is currently available through GPS or GLONASS, to improve availability of positioning services at higher latitudes, and to provide an independent positioning system upon which European nations can rely even in times of war or political disagreement. The current project plan has the system as operational by 2011–12, three or four years later than originally anticipated.

GPS/Galileo Signal and Channel
GPS Galileo
Pilot channel none yes
BOC modulation none yes
Satellite code length 1ms 4ms

GPS signal
The Global Positioning System (GPS) is a worldwide radio-navigation system formed from a constellation of 24 satellites and their ground stations. It uses spread spectrum communication.

Design of complex filter
1.Complex filter is a bandpass filter with an asymmetric amplitude response
2.Use the transconductor and capacitor to replace resistor and inductor

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