Abstract: A method, a sensor and a system for observing the presence, location, movement and/or attitude of a person in a monitored area. The sensor comprises means for processing the measurement signal of the sensor, such as measuring electronics, and means for communicating measurement results and/or data relating to the measurement results for further processing. The sensor is a radar-based sensor, such as an as a frequency-modulated continuous-wave MIMO radar-based sensor, configured to detect persons in the monitored area and to measure and detect the location, velocity and/or shape of the monitored person. The sensor comprises means for detecting the orientation of the sensor, such as an acceleration sensor, and the sensor is configured to take the detected orientation of the sensor into account when determining measurement results for the monitored person, e.g. by compensating the measurement results based on the detected orientation.

Abstract: A method, a sensor and a system for the sensor includes a device for processing the measurement signal of the sensor, such as measuring electronics, and a device for communicating measurement results and/or data relating to the measurement results for further processing. The sensor is a radar-based sensor, such as a frequency-modulated continuous-wave MIMO radar-based sensor, configured to detect persons in the monitored area and to measure and detect movement, such as breathing frequency, location, velocity and/or shape of the monitored person. The sensor or a monitoring system connected to the sensor is configured to determine at least one of the following states of the person: breaks or interruptions with breathing of the monitored person, e.g. in order to recognize sleep apnea, and/or immobility of the monitored person, e.g. in order to avoid bedsores or pressure ulcers, and the sensor and/or the monitoring system is configured to provide an alarm based on the determined state of the person.