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15 Cards in this Set
- Front
- Back
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What is the formula for calculating target range?
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elapsed time
--------------- 12.36 seconds per nautical mile |
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What is the formula for calculating minimum range of a radar system?
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(pulse width + recovery time) x 164 yards/microsecond
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What factors influence the maximum range of a radar?
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carrier frequency, peak power, pulse-repetition frequency, and receiver sensitivity
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What is pulse repetition time?
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The time between the beginning of one pulse and the beginning of the next pulse (prt = 1/prf)
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What is the formula for calculating the max range of a radar?
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162,000 mile/second
-------------------- x prt 2 |
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What is the duty cycle of a radar system?
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The ratio of transmitter time on to time off (product of pw and prf)
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What is range resolution?
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The ability to distinguish between two or more targets on the same bearing (pw x 164 yards per microsecond)
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What main component of a radar system supplies timing signals to coordinate the operation of the entire system?
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Synchronizer
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What are the basic requirements of a synchronizer?
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Free running, stable in frequency, and frequency variable (in steps)
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What component of a radar controls the pulse, width, and amplitude?
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Modulator
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What is the main function of the duplexer?
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Isolation of the receiver during transmission
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What type of transmitter amplifies a low-level to the desired power level using a series of microwave amplifiers such as traveling-wave tubes or klystrons?
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Power-amplifier transmitter
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What type of generators produce a movable gate that measures range based on elapsed time and can be used on A-scope and ppi displays?
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Range-gate generators
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When testing with an echo box, what does ring time represent?
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Gives a relative indication of both transmitter output power and receiver sensitivity.
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What is TR recovery time?
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The time required for the TR tube to deionize after each transmitted pulse
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