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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
Consider the following statements regarding the satellite imaging:
1. The satellite orbit is fixed in the inertial space
2. During successive across-track imaging, the earth rotates beneath the sensor
3. The satellite images a skewed area
Which one of the following statements is/are correct?

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

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Elements Of Remote Sensing
The coherence length over which there is a strong relationship between amplitudes is;

None of these
Directly proportional to the bandwidth
The square of the bandwidth
Inversely proportional to the bandwidth

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Elements Of Remote Sensing
A passive sensor uses:

Flash light as a source of energy
Its own source of energy
None of these
Sun as the source of energy

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Elements Of Remote Sensing
Coherence of two electromagnetic waves takes place if their phase difference is:

Constant in time
Constant in time and space
Constant in space
None of these

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Elements Of Remote Sensing
The GPS space segment consists of Navigation Satellite Timing and Ranging whose number is :

24
8
16
12

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