Hit count

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The number of hits m is an evaluation criterion for the work of radar devices . It indicates how many echo signals per target are generated during each antenna rotation or panning. So that radar systems can evaluate the target information with sufficient accuracy, depending on the working principle of the radar system, hit numbers from 1 to 20 are necessary.

Number of hits is the number of transmission pulses during the lighting time

${\displaystyle m={\frac {T_{D}}{PRT}}={\frac {\Theta _{AZ}\cdot 60}{360\cdot n\cdot PRT}}}$

T _D = the lighting time

PRT = Pulse Repetition Time

Θ _AZ = half width of the antenna in the azimuth

n = number of revolutions of the antenna per minute

60 = conversion factor from minute to second

360 = degrees in a full circle

Radar devices that work with the monopulse method are able to determine the coordinates of the target with just a single transmission pulse. These radar devices only need three pulses under difficult conditions such as strong interference from fixed target echoes. The number of hits on this radar is therefore 1 to 3.

Classic radar devices with digital target processing usually require at least 8 hits in the sliding window method in order to generate a target symbol. Even older radar devices with analog target processing can display an easily evaluable target mark on the radar screen with 15 to 20 hits .