A circularly scanning, fan beam radar has a rotation rate of 2 seconds per revolu- tion. The

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A circularly scanning, fan beam radar has a rotation rate of 2 seconds per revolu- tion. The azimuth beamwidth is 1.5 degrees and the radar uses a PRF of 12.5KHz. The radar uses an unmodulated pulse with a width of 1.2s and searches a range window that extends from 15Km to 100Km. The range cells used during search are separated by one pulse width. It is desired that the false alarm probability be set so that the radar experiences only one false alarm every 2min. What is the required Pfa for each range cell? What is the threshold-to-noise ratio, in dB. needed to maintain that Pfa?

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