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A radar with a 1° horizontal beamwidth that sweeps the entire 360° horizon every 2 seconds with a PRF of 1080 Hz will radiate 6 pulses over each 1-degree arc. If the receiver needs at least 12 reflected pulses of similar amplitudes to achieve an acceptable probability of detection, then there are three choices for the designer: double the PRF ...
Dwell time (T D) in surveillance radar is the time that an antenna beam spends on a target. [1] The dwell time of a 2D–search radar depends predominantly on the antenna's horizontal beam width θ AZ, and; the turn speed n of the antenna (in rotations per minute or rpm, i.e. 360 degrees in 60 seconds = multiplied by a factor of 6).
The radar horizon is a critical area of performance for aircraft detection systems, defined by the distance at which the radar beam rises enough above the Earth's surface to make detection of a target at the lowest level possible.
The resolution of any radar depends on the width of the beam and the range to the target. For example; a radar with 1 degree beam width and a target at 120 km (75 mi) range will show the target as 2 km (1.2 mi) wide. To produce a 1-degree beam at the most common frequencies, an antenna 1.5 kilometres (0.93 miles) wide is required.
The radar mile is the time it takes for a radar pulse to travel one nautical mile, reflect off a target, and return to the radar antenna. Since a nautical mile is defined as 1,852 m, then dividing this distance by the speed of light (299,792,458 m/s), and then multiplying the result by 2 yields a result of 12.36 μs in duration.
The radar can be recognised by its distinctive large "orange-peel" paraboloid reflector antenna. ... Beam width: 1.20 (horizontal); 1.30 (vertical) PRF: 400 or 800 Hz ...
Radar beam width: 1.2° IR FOV: 1.3° X 1° Tracking coverage: 360° (Az); -30°~85° (El) Tracking Radar Frequency: Ku band; Polarization: Horizontal; Antenna type: Cassegrain antenna; IR Tracker Spectral band 3~5 μm; Pixel Resolution: 320x240; FOV: 1.3° X 1° Transmitter Antenna gain: 21 dB; Beam width: Wide 20°, Narrow 3° Ambient temperature
The radar worked at a Pulse Repetition Frequency (PRF) of 300 Hz, a pulse length of 2 μs. Peak power was 1 MW. [9] The AN/APS-20B, designed to be carried by larger aircraft, differed in size and capability. It had a peak power of 2 MW and a horizontal beam width of 1.5° and vertical of 6°. Pulse width remained 2 μs. [10]