Telecommunications Satellite Communications 3

Question 1

What is a 'link budget' in satellite communications?

Accepted Answer

A calculation of all signal gains and losses along a satellite communication path

Answer

The financial cost of operating a satellite communication link

Answer

The amount of data transmitted per billing period on a satellite link

Answer

The allocation of satellite bandwidth among competing users

Question 2

EIRP (Effective Isotropic Radiated Power) is calculated as the product of:

Accepted Answer

Transmitter power and antenna gain

Answer

Receiver sensitivity and noise figure

Answer

Signal frequency and available bandwidth

Answer

Orbital altitude and transponder capacity

Question 3

Which technique transmits two independent signals on the same frequency using orthogonal signal polarizations (e.g., horizontal and vertical) to double satellite capacity?

Accepted Answer

Polarization frequency reuse

Answer

Code Division Multiple Access (CDMA)

Answer

Orbital slot sharing

Answer

Spatial Division Multiplexing (SDM)

Question 4

Adjacent Satellite Interference (ASI) in the geostationary arc is caused by:

Accepted Answer

Signals from nearby satellites being captured along with the intended satellite's signal

Answer

Interference from terrestrial microwave links sharing the same frequency

Answer

Cross-polarization leakage within the same satellite transponder

Answer

Intermodulation products generated inside the earth station amplifier

Question 5

The G/T ratio used to characterize satellite receiver performance stands for:

Accepted Answer

Gain-to-Noise Temperature ratio

Answer

Ground-to-Terminal link ratio

Answer

Geographic-to-Temporal coverage ratio

Answer

Gain-to-Traffic capacity ratio

Question 6

Which satellite was the first commercial geostationary communications satellite, launched in 1965?

Accepted Answer

Intelsat I (Early Bird)

Answer

Sputnik 1

Answer

Telstar 1

Answer

COMSTAR D-1

Question 7

In satellite communications, a 'spot beam' antenna pattern refers to:

Accepted Answer

A focused antenna beam that illuminates a small geographic area with higher power density

Answer

A satellite that provides coverage to only a single point on Earth

Answer

A signal aimed directly at another satellite in the constellation

Answer

A narrow-band frequency allocation reserved for a single high-priority user