| Fire-control Radar |
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Fire-control radars operate in three different phases:
The performance of a fire-control radar is determined by primarily by two factors, radar resolution and atmospheric conditions. Radar resolution is the ability of the radar to differentiate between two targets closely located. The first, and most problematic, is gaining high range resolution. To do this in a basic fire-control radar system, it must operate at a high pulse repetition frequency and have a high receiver sensitivity. Bearing resolution is typically ensured by using a narrow (one or two degree) beamwidth. Atmospheric conditions, such as moisture lapse, temperature inversion, and dust particles affect radar performance as well. Moisture lapse and temperature inversion often times cause ducting, in which RF energy is bent as it passes through hot and cold layers. This can either extend or reduce the radar horizon, depending on which way the RF is bent. Dust particles, as well as water droplets, cause attenuation of the RF energy, translating into a loss of effective range. In both cases, a lower pulse repetition frequency makes the radar less susceptible to atmospheric conditions. On of the first successful fire-control radars, the SCR-584 , was used effectively and extensively by the Allies during World War II . Examples of fire-control radars currently in use by the United States Navy :
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