Elements Of Remote Sensing
If flying height of a spacecraft is H, the length of air base is B and the parallax difference between two points is dp, then the difference in height

h = (H/B) dp
h = dp/(B/H)
h = (B/H) dp
h = dp/(H/B)

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

Signal propagation biases due to the sphere and troposphere propagation
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

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Elements Of Remote Sensing
Which one of the following statements is correct regarding the GPS satellites?

All of these
The satellite transmits two L band signals (L1 with 1575.42 MHz and L2 with 1276.6 MHz)
The inclination of axis satellite is 55°
The nominal altitude is about 20,200 km

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