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Continuous Wave (CW) Radar
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Continuous Wave (CW) Radar
Introduction
Small CW Doppler radar sets are used as motion sensors to open the doors, for measuring the speed of automobiles.
Purpose-built instrumentation CW Doppler radar units can be used to observe physical phenomena, such as the Doppler spectra of moving targets or observation of nature in general.
In this video we will be covering the following.
- CW radar architectures
- Radar range equation applied to small CW Doppler radar
- Signal Processing
- working examples of small CW Doppler radar sets will be detailed
CW Radar Architecture
range to target for a CW coherent radar system can be described in terms of phase, where
If the target is moving at a velocity from an initial position Ri then its position
with respect to velocity and time can be described as,
R=υt+Ri
Therefore the phase of the scattered field from the moving target is changing
with respect to time.
Doppler is the time rate change of scattered phase. A time rate change of phase is a frequency shift. This frequency shift is described by the Doppler equation which can be derived by re-arranging terms from above