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:

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

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Elements Of Remote Sensing
According to the Snell's law if an electromagnetic wave is incident in a medium (refractive index n₁) on another medium (refractive index m₂);

Neither (A) nor (B)
Both (A) and (B)
The angle of incidence is equal to the angle of refraction
The angle of refraction (θr) is given by sin θ₂ = (n₁/n₂) sin θi

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Elements Of Remote Sensing
Geodimeter is based on:

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

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Elements Of Remote Sensing
Which one of the following residual biases involves the GPS accuracy?

All listed here
Receiver-dependent biases due to clock stability with line
Satellite dependent biases due to uncertainty in the orbital parameters of the satellite
Signal propagation biases due to the sphere and troposphere propagation

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