Elements Of Remote Sensing
The various stages occuring in GPS system are described below:
1. Generation of an output to the user
2. Detection of the GPS signals
3. Processing the data in the built-in-computer
4. Decoding the GPS signal.
The correct sequence of the stages is:

2, 3, 4, 1
3, 1, 2, 4
2, 4, 3, 1
1, 2, 3, 4

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Elements Of Remote Sensing
Geodimeter is based on:

Propagation of infrared radiation
The visible light as carrier with frequency of the order of 5 × 1014 Hz
Propagation of modulated light waves
High frequency radio waves

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