SAR FUNDAMENTALS UPDATED EXAM
QUESTIONS AND ANSWERS 100%
VERIFIED. JUST RELEASED
1. What is the primary factor determining the slant range resolution of a SAR system?
A. The physical length of the antenna
B. The speed of the platform
C. The bandwidth of the transmitted pulse
D. The pulse repetition frequency (PRF)
Answer: C
Conceptual Explanation: Range resolution is inversely proportional to the bandwidth of
the signal (c/2B). A wider bandwidth allows for a finer range resolution.
2. In SAR theory, how does the theoretical best azimuth resolution relate to the physical
antenna length (L)?
A. L * wavelength
B. 2L
C. L^2
D. L/2
,Answer: D
Conceptual Explanation: Unlike real aperture radar, SAR azimuth resolution is
theoretically independent of distance and equal to half the physical length of the antenna
along the track.
3. Which SAR distortion occurs when the top of a mountain is closer to the sensor than its
base in the slant range geometry?
A. Foreshortening
B. Shadowing
C. Speckle
D. Layover
Answer: D
Conceptual Explanation: Layover occurs when the top of a feature is imaged before the
bottom because the top is closer to the sensor in slant range.
4. What is the physical cause of the ‘speckle’ phenomenon in SAR imagery?
A. Atmospheric interference
B. Quantization errors during digital conversion
C. Electronic noise in the receiver
D. Coherent interference of multiple backscatterers within a single resolution cell
Answer: D
, Conceptual Explanation: Speckle is caused by the random constructive and destructive
interference of coherent waves reflecting from various elements within a single resolution
cell.
5. Which frequency band is most effective for penetrating dense forest canopies to image the
ground surface?
A. L-band (~24 cm)
B. C-band (~6 cm)
C. X-band (~3 cm)
D. K-band (~1 cm)
Answer: A
Conceptual Explanation: Lower frequencies (longer wavelengths) like L-band have higher
penetration capabilities through vegetation compared to higher frequencies like X or C
band.
6. The Doppler frequency shift in SAR is primarily used to resolve which dimension?
A. Slant range
B. Elevation
C. Polarization
D. Azimuth
Answer: D
QUESTIONS AND ANSWERS 100%
VERIFIED. JUST RELEASED
1. What is the primary factor determining the slant range resolution of a SAR system?
A. The physical length of the antenna
B. The speed of the platform
C. The bandwidth of the transmitted pulse
D. The pulse repetition frequency (PRF)
Answer: C
Conceptual Explanation: Range resolution is inversely proportional to the bandwidth of
the signal (c/2B). A wider bandwidth allows for a finer range resolution.
2. In SAR theory, how does the theoretical best azimuth resolution relate to the physical
antenna length (L)?
A. L * wavelength
B. 2L
C. L^2
D. L/2
,Answer: D
Conceptual Explanation: Unlike real aperture radar, SAR azimuth resolution is
theoretically independent of distance and equal to half the physical length of the antenna
along the track.
3. Which SAR distortion occurs when the top of a mountain is closer to the sensor than its
base in the slant range geometry?
A. Foreshortening
B. Shadowing
C. Speckle
D. Layover
Answer: D
Conceptual Explanation: Layover occurs when the top of a feature is imaged before the
bottom because the top is closer to the sensor in slant range.
4. What is the physical cause of the ‘speckle’ phenomenon in SAR imagery?
A. Atmospheric interference
B. Quantization errors during digital conversion
C. Electronic noise in the receiver
D. Coherent interference of multiple backscatterers within a single resolution cell
Answer: D
, Conceptual Explanation: Speckle is caused by the random constructive and destructive
interference of coherent waves reflecting from various elements within a single resolution
cell.
5. Which frequency band is most effective for penetrating dense forest canopies to image the
ground surface?
A. L-band (~24 cm)
B. C-band (~6 cm)
C. X-band (~3 cm)
D. K-band (~1 cm)
Answer: A
Conceptual Explanation: Lower frequencies (longer wavelengths) like L-band have higher
penetration capabilities through vegetation compared to higher frequencies like X or C
band.
6. The Doppler frequency shift in SAR is primarily used to resolve which dimension?
A. Slant range
B. Elevation
C. Polarization
D. Azimuth
Answer: D
