# Pulse repetition frequency

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Pulse repetition frequency

Pulse Repetition Frequency (PRF) is the number of pulses transmitted per second by a radar. The reciprocal of this is called the Pulse Repetition Time (PRT), Pulse Repetition Interval (PRI), or Inter-Pulse Period (IPP), which is the elapsed time from the beginning of one pulse to the beginning of the next pulse. PRF is important since it determines the maximum target range ("R"max) and maximum Doppler velocity ("V"max) that can be accurately determined by the radar.

Range ambiguity

A radar system determines range through the time delay between pulse transmission and reception by the relation::$Range = frac\left\{c au\right\}\left\{2\right\}$For accurate range determination a pulse must be transmitted and reflected before the next pulse is transmitted. This gives rise to the maximum range limit:

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The maximum range also defines a range ambiguity for all detected targets. Because of the periodic nature of pulsed radar systems, it is impossible for a radar system to determine the difference between targets separated by integer multiples of the maximum range using a single PRF. More sophisticated radar systems avoid this problem through the use of multiple PRFs either simultaneously on different frequencies or on a single frequency with a changing PRT.

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• pulse repetition frequency — impulsų dažnis statusas T sritis automatika atitikmenys: angl. pulse frequency; pulse rate; pulse repetition frequency vok. Impulsfolgefrequenz, f; Impulsfrequenz, f; Pulsfrequenz, f rus. частота импульсов, f; частота повторения импульсов, f;… …   Automatikos terminų žodynas

• pulse repetition frequency — impulsų dažnis statusas T sritis Standartizacija ir metrologija apibrėžtis Tam tikro pavidalo impulsų kartojimosi dažnis. atitikmenys: angl. pulse frequency; pulse rate; pulse repetition frequency vok. Impulsfolgefrequenz, f; Impulsfrequenz, f;… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

• pulse repetition frequency — impulsų dažnis statusas T sritis fizika atitikmenys: angl. pulse frequency; pulse rate; pulse repetition frequency vok. Impulsfolgefrequenz, f; Impulsfrequenz, f; Pulsfolgefrequenz, f rus. частота импульсов, f; частота повторения импульсов, f;… …   Fizikos terminų žodynas

• pulse repetition frequency — 1. In lasers, the number of pulses that occur each second. 2. In radar, the number of pulses that occur each second. Pulse repetition frequency should not be confused with transmission frequency, which is determined by the rate at which cycles… …   Military dictionary

• pulse repetition frequency — Telecommunications. the number of pulses per second in a system of pulse transmission. Also, pulse repetition frequency. Abbr.: PRF. * * * …   Universalium

• pulse repetition frequency — Telecommunications. the number of pulses per second in a system of pulse transmission. Also, pulse repetition frequency. Abbr.: PRF …   Useful english dictionary

• pulse repetition frequency — In radar, the number of pulses that occur each second. Also called the pulse recurrence rate, or PRR. It should not be confused with the transmission frequency, which is determined by the rate at which cycles are repeated within the transmitted… …   Aviation dictionary

• Pulse-Doppler radar — Pulse Doppler is a radar system capable of not only detecting target location (bearing, range, and altitude), but also measuring its radial velocity (range rate). It uses the Doppler effect to determine the relative velocity of objects; pulses of …   Wikipedia

• pulse frequency — impulsų dažnis statusas T sritis automatika atitikmenys: angl. pulse frequency; pulse rate; pulse repetition frequency vok. Impulsfolgefrequenz, f; Impulsfrequenz, f; Pulsfrequenz, f rus. частота импульсов, f; частота повторения импульсов, f;… …   Automatikos terminų žodynas

• pulse frequency — impulsų dažnis statusas T sritis Standartizacija ir metrologija apibrėžtis Tam tikro pavidalo impulsų kartojimosi dažnis. atitikmenys: angl. pulse frequency; pulse rate; pulse repetition frequency vok. Impulsfolgefrequenz, f; Impulsfrequenz, f;… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas