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Dwell time (radar)

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Dwell time (TD) 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 θAZ, 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:

T D = θ A Z 6 ⋅ n (in seconds) {\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

  1. "Dwell Time and Hits Per Scan". Radartutorial.
  2. P.E. Rademacher; B.H. Cantrell; G.C. Tavik, Clutter filtering and processing techniques for EMI detection and angle measurement in pulse Doppler radars, 2021, doi:10.1109/NRC.1996.510693

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

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