11/29/2023 0 Comments Unambiguous doppler shift![]() This gives each radar system a characteristic PRF, which can be used in electronic warfare to identify the type or class of a particular platform such as a ship or aircraft, or in some cases, a particular unit. Using older electronics, PRFs were generally fixed to a specific value, or might be switched among a limited set of possible values. Radar systems must balance these two competing requirements. This creates stronger reflections that make detection easier. Conversely, higher PRFs produce shorter maximum ranges, but broadcast more pulses, and thus radio energy, in a given time. Longer periods are required for longer range signals, requiring lower PRFs. Since the radio signal has to travel out to the target and back again, the required inter-pulse quiet period is a function of the radar's desired range. A related measure is the pulse width, the amount of time the transmitter is turned on during each pulse.Īfter producing a brief pulse of radio signal, the transmitter is turned off in order for the receiver units to hear the reflections of that signal off distant targets. For instance, a typical World War II radar like the Type 7 GCI radar had a basic carrier frequency of 209 MHz (209 million cycles per second) and a PRF of 300 or 500 pulses per second. The PRF is normally much lower than the frequency. Both are measured in terms of cycle per second, or hertz. In radar, a radio signal of a particular carrier frequency is turned on and off the term "frequency" refers to the carrier, while the PRF refers to the number of switches. The term is used within a number of technical disciplines, notably radar. The pulse-repetition frequency ( PRF) is the number of pulses of a repeating signal in a specific time unit. Not to be confused with Pulse-per-second signal.
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