by DeepWebLabs
GATE-GE SERIES
Geomatics

Satellite Communications

11 previous year questions.

Volume: 11 Ques
Yield: Medium

High-Yield Trend

11
2025

Chapter Questions
11 MCQs

01
PYQ 2025
medium
geomatics ID: gate-ge-

Principal Component Analysis is performed on a 4-band IRS satellite image. The eigenvalues computed from the covariance matrix are 887.60, 75.20, 37.60 and 6.73, respectively. The percentage of total variance explained by the third principal component ( ) is_______________(rounded off to 2 decimal places).}

02
PYQ 2025
medium
geomatics ID: gate-ge-

The histogram of a red band in a 3-bit satellite image is shown below. Which of the following statements is/are correct?

1
There are more darker pixels in the image
2
There are more brighter pixels in the image
3
The mean digital number of the image is 1250
4
It may be predicted that approximately 40% of area in the image is covered by material with low spectral albedo in red band
03
PYQ 2025
medium
geomatics ID: gate-ge-

For the correlation matrix of a 4-band satellite image as shown below, which of the following statements is/are correct?

Band 1Band 2Band 3Band 4
Band 110.950.360.92
Band 20.9510.400.93
Band 30.360.4010.42
Band 40.920.930.421
1
Band 3 provides some unique information not found in other bands
2
There is high redundancy in band 2 and 4
3
The standard deviation of all the bands is equal
4
Image cannot be classified using bands 1 and 3 only
04
PYQ 2025
medium
geomatics ID: gate-ge-

Principal Component Analysis is performed on a 4-band IRS satellite image. The eigenvalues computed from the covariance matrix are 887.60, 75.20, 37.60 and 6.73, respectively. The percentage of total variance explained by the third principal component ( ) is __________ (rounded off to 2 decimal places).

05
PYQ 2025
medium
geomatics ID: gate-ge-
Which one of the following techniques is NOT used to atmospherically correct the satellite image?
1
Image normalization using histogram adjustment
2
Radiative transfer model
3
Image to image registration
4
Image normalization using regression
06
PYQ 2025
medium
geomatics ID: gate-ge-
The geophysical variables that can be measured/derived from the Global Navigation Satellite System observations is/are
1
ocean color
2
precipitable water vapor
3
soil moisture
4
seismic motion
07
PYQ 2025
medium
geomatics ID: gate-ge-
Which of the following conditions is/are essential for geostationary satellite orbits?
1
Eccentricity is zero
2
Inclination is close to zero
3
Prograde
4
Retrograde
08
PYQ 2025
medium
geomatics ID: gate-ge-
A country has 7 permanent Global Navigation Satellite System stations covering its territory. Their surveying organization generates a network solution after applying double differencing to the observations. These 7 permanent stations can view 5 to 10 common satellites at any given epoch. What is the range (minimum, maximum) of the number of independent double differenced observables possible?
1
(35, 70)
2
(30, 56)
3
(28, 48)
4
(24, 54)
09
PYQ 2025
medium
geomatics ID: gate-ge-
In the choke ring antenna there are concentric cylinders placed around the antenna that are of a certain depth to minimize the multipath effect. If the signal wavelength is , then the depth of the cylinders in the choke ring antenna should be
1

2

3

4

10
PYQ 2025
medium
geomatics ID: gate-ge-
In the context of Global Navigation Satellite System positioning, which of the following statement is correct?
1
In Differential Global Navigation Satellite System, the corrections to the coordinates of the user are transmitted from the reference station
2
text{Real-time kinematic positioning and stop-and-go positioning are both kinematic methods
3
Rapid-static positioning is not a relative positioning technique
4
Double differencing eliminates the clock errors and improves the noise in the differenced pseudorange observations
11
PYQ 2025
medium
geomatics ID: gate-ge-

In the context of Global Navigation Satellite System positioning, the Saastamoinen model provides a correction for ____________

1

2

3

4