RSSM #3.3 - Microwaves

What are the advantages of SARs w.r.t. optical remote sensing

• Weather independent (e.g., clouds)

• Independent of illumination conditions (sunlight)

• Easier and faster to process.

• Do not require the need of apriori knowledge of the DEM

What is the Doppler centroid of a side-looking SAR?

• <0 Hz

• 0 Hz

• >0 Hz

What is the Doppler centroid of a forward-looking SAR?

• <0 Hz

• 0 Hz

• >0 Hz

Which of these bands has the longest wavelength

• Ku

• X

• S

• L

• P

Which of these bands has the highest frequency

• Ku

• X

• S

• L

• P

Which band is used to up/download telemetry and telecommands?

• Ku

• X

• C

• S

• L

Which band is used to download payload data?

• Ku

• X

• C

• S

• L

Which of these statements is true regarding the antenna pattern:

• The 3dB beamwidth contains 50% of the power of the antenna

• The 3dB beamwidth is the angle aperture from the points at 50% of the peak power of the antenna pattern.

• The 3dB beamwidth contains 70% of the power of the antenna

• The 3dB beamwidth is the angle aperture from the points at 70% of the peak power of the antenna pattern.

Which of these antennas is more directional:

• HWFM = 10 deg

• HWFM = 1 deg