A person with a velocity of 0 m/s is static, but due to the breathing and heartbeat of an individual, there is still micro motion throughout the body that can be detected by the RPD. Static residual motion is defined by these micro motions. To emulate static residual movement using a trihedral target corner reflector, Section 5.2.3.5 defines the corner reflector needs to move 2 mm forward and 2 mm backwards with a velocity of 2 mm/s. To ensure that even the smallest micro movements done by individuals even slightly within the detection zone, the corner reflector test target is to have a RCS of 0.17 m².

Based on the RCS formula for a trihedral corner reflector with L being the edge length and λ being the RPD’s wavelength of 60 GHz, it must be of edge length 3.173 cm to achieve a RCS of 0.17 m². For the tests documented here, a corner reflector of radius 3 cm is used, which results in a RCS of 0.14 m², meaning the target used is more challenging to detect than what the standard requires.