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Lecture Slide 5B

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Questions and Answers

What is the primary purpose of multi-looking in SAR image processing?

To reduce speckle in the final detected image (correct)
To increase spatial resolution
To introduce constructive interference
To enhance radiometric resolution

What is the result of reducing speckle in SAR images?

Increased scattering returns
Improved spatial resolution
Enhanced radiometric resolution (correct)
Reduced automatic gain control effects

What is the primary cause of speckle in SAR images?

Incoherent illumination
Destructive interference
Scattering returns
Coherent illumination (correct)

What is the effect of azimuth ambiguity in SAR images?

A copy of the target appears offset in both range and azimuth (B) Signup and view all the answers

What is the result of automatic gain control effects on SAR images?

Affected image radiometrics and geometrics (A) Signup and view all the answers

What is the main cause of scintillating bright linear features in SAR images?

Specular reflection from targets within a very narrow slant range distance (A) Signup and view all the answers

What is the pattern of spatial tone variations in an image referred to as?

Image texture (B) Signup and view all the answers

What is the result of a radar pulse's return from an object and the return from the satellite's nadir?

Nadir Ambiguity (B) Signup and view all the answers

What is the term used to describe the unwanted brightness variation in a radar image due to radar artifacts?

Scalloping (A) Signup and view all the answers

What is the term used to describe the strength of radar backscatter in an image?

Image tone (A) Signup and view all the answers

What is the primary cause of speckle noise in SAR imagery?

Random constructive and destructive interference (A) Signup and view all the answers

What is the effect of speckle noise on the interpretation of SAR images?

It makes interpretation more difficult (B) Signup and view all the answers

What is the purpose of multiple-look filtering in SAR imagery?

To reduce the effects of speckle noise (A) Signup and view all the answers

What occurs when reflections from individual blades of grass within a resolution cell combine?

Random constructive and destructive interference (B) Signup and view all the answers

How can speckle noise be reduced in SAR imagery?

By averaging independent samples (B) Signup and view all the answers

What is the result of local constructive interference in radar images?

Bright speckles (C) Signup and view all the answers

What type of noise inherently exists in SAR imagery?

Speckle noise (C) Signup and view all the answers

What is the cause of fading in a coherent imaging system?

Variation in the phase delay caused by multiple targets in a resolution cell (D) Signup and view all the answers

What is the relationship between waves in a beam of electromagnetic radiation when they are coherent?

They are in phase (D) Signup and view all the answers

What is the result of local destructive interference in radar images?

Dark speckles (B) Signup and view all the answers

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