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Questions and Answers
What is the primary cause of fading in a coherent imaging system?
What is the primary cause of fading in a coherent imaging system?
- Variation in the phase delay caused by multiple targets in a resolution cell with range variations differing by less than a wavelength (correct)
- Changes in the polarization of the radar waves
- Differences in the amplitude of the received signal
- Variations in the frequency of the electromagnetic radiation
What is the characteristic appearance of speckle in radar images?
What is the characteristic appearance of speckle in radar images?
- A grainy, 'salt and pepper' texture (correct)
- A streaked, linear pattern
- A smooth, uniform texture
- A mottled, patchy appearance
What is the result of constructive interference in a coherent imaging system?
What is the result of constructive interference in a coherent imaging system?
- A complete loss of signal
- Bright speckles in the image (correct)
- Dark speckles in the image
- No visible effect in the image
What is the term for the fixed relationship between waves in a beam of electromagnetic radiation?
What is the term for the fixed relationship between waves in a beam of electromagnetic radiation?
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What is the primary source of image artifacts in radar imagery?
What is the primary source of image artifacts in radar imagery?
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