# TSM 320 Carolinas College Number of Satellites in the GEO Systems Exam Practice

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abbs32

Computer Science

TSM 320

Carolinas College of Health Sciences

TSM

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The manner in which a wireless signal move is often referred to as ………………………………… behavior .

When a wave hits an object that is bigger than its wavelength the wave may bounce in different direction and this is called ………………………………..

Antennas are active element and have gain such as OpAmp. T F

Directivity of antennas are based on the gain of antennas. T F

Active gain is related to antennas and passive gains are related to amplifier. T F

Multipath can degrade the strength and quality of the received signal and even cause corruption or cancelled signals due to the effect of different spreading delay of received signal. T F

When it comes to degradation of signal in its propagation path the inverse square law is applied. This law states that the change in power of a signal is equal to 1 divided by the square of the change in

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Fall2020

TSM320 Test

[Institution]
[Name]

Fall2020

TSM320 Test

2

1) Inter-satellite handover is not very common in ISL satellites.

2) What is the minimum number of satellites in the GEO systems satellite to cover the
whole globe?24

3) Calculate the round-trip time propagation delay for a satellite in LEO with altitude
of 300 miles. Assume speed of light is 186282 miles/sec.

Distance =300 miles
Propagation speed =1.86282 * 105 m/s
Tp is propagation time =Distance/propagation speed
Tp =300 (1609.344) / 1.86282*105 sec
Tp = 482803/1.86282*105 sec
=2.59 *1012 sec

4. Name several characteristics of radio frequency.
Wavelength is long than infrared light in the electromagnetic spectrum
Amplitude corresponds to the electrical field of the wave
Frequency- between 30 (Hz) and 300 gigahertz (GHz)
5. Scattering can most easily be described as multiple reflections.
6. Signals with the same phase has a constructive amplitude, but signals with different phase
have destructive amplitude consequences. T F

Fall2020

TSM320 Test

3

7. The phase difference between two signals is very important to understand the effects of
an RF phenomenon known as multipath.
8. Low frequency is used for dense urban area and high frequency are used for rural area. T
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