Dwell time (radar)

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).

Dwell time is calculated by:

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.^[2]

References

^ "Dwell Time and Hits Per Scan". Radartutorial.
^ 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.

[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

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