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Elements Of Remote Sensing

Elements Of Remote Sensing
In GPS, receivers are used are;

Mechanical clocks
Quartz clocks
Electronic clocks
Atomic clocks

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Elements Of Remote Sensing
For C band Synthetic Aperture Radar (SAR) with Doppler band width of 1300 Hz, the coherence length loch is:

250 km
230 km
500 km
130 km

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Elements Of Remote Sensing
Rayleigh's criteria for a rough surface is: (where letters carry their usual meanings).

h > λ/Δ cos θ
h < λ/8 cos θ
h > λ/8 cos θ
h = λ/8 cos θ

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Elements Of Remote Sensing
Which one of the following statements regarding remote sensing is correct?

The emission of electromagnetic radiation from the target
The interaction of the electromagnetic radiation with the target
Neither (A) nor (B)
Both (A) and (B)

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Elements Of Remote Sensing
The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from:

10-10 to 1010 m
10-8 to 108 m
10-8 to 106 m
10-10 to 106 m

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Elements Of Remote Sensing
The normal altitude of GPS satellite is about

36,100 km
20,200 km
16,200 km
24,400 km

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