  We propose a method to measure the respiration of a rhesus monkey using a
millimeter-wave radar system with an antenna array. Unlike humans, small
animals are generally restless and hyperactive in nature, and suppression of
their body motion components is thus necessary to realize accurate respiratory
measurements. The proposed method detects and suppresses nonperiodic body
motion components while also combining and emphasizing the periodic components
from multiple echoes acquired from the target. Results indicate that the
proposed method can measure respiration rate of the target monkey accurately,
even with frequent body movements.
