The invention relates to the field of non-contact physical sign
perception, in particular to a
human body vital sign
perception method based on VMD + ACMD joint
decomposition, which comprises the following steps of
data acquisition, distance angle
heat map generation,
direct current bias removal, expansion DACM phase extraction,
signal decomposition,
signal reconstruction,
feature extraction, time-
frequency analysis and the like. According to the invention, the VMD and the ACMD are combined for use, and the
frequency resolution capability of the VMD and the adaptive
decomposition capability of the ACMD are fully utilized. Through the combined decomposition, the analysis capability of the micro-motion
signal is enhanced, the sign extraction precision is remarkably improved, compared with a traditional single decomposition method, the scheme improves the separation precision of the sign signal, the
modal aliasing problem is reduced, the higher
signal quality is ensured, and by enhancing the main frequency component of the sign signal, the sign extraction precision is improved. Interference of
background noise is effectively suppressed, especially in a complex or high-
noise environment, high signal-to-
noise ratio of signals can be ensured, and accurate extraction of sign signals such as
heart rate and
respiratory rate can be improved.