Dwell time (radar)

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Dwell time (T_D) in surveillance radar is the time that an antenna beam spends on a target. 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).

Dwell time is calculated by:

${\displaystyle T_{D}={\frac {\theta _{AZ}}{6\cdot n}}\quad \quad {\text{(in seconds)}}}$

A block of constant PRF and coherently phased RF pulses, is referred to as a coherent dwell interval or coherent dwell time.

References

 This article incorporates text by Christian Wolff available under the CC BY-SA 3.0 license.