The invention is directed to a receiver (100) for an RF presence-sensing arrangement (150). The receiver is configured to receive a first intra-network RF sensing signal (102) from a first transmitter (104), both pertaining to a first local-area RF communication network (106) spanning a first presence-sensing volume (114) and to additionally receive an inter-network RF sensing signal (108) from a second transmitter (110) pertaining to a second local-area RF communication network (112), thus spanning a third presence-sensing volume (120) and to provide a first and an inter-network signal-strength signal (S.sub.1, S.sub.3) indicative of a respective received-signal strength. In the RF presence-sensing arrangement, a presence detection unit (122) is configured to provide, based on the signal-strength signals, a presence detection signal (S.sub.DET) indicative of a change in presence of a subject or object in the first or in the third presence-sensing volume, thus increasing the accuracy of the presence determination.

A method for use in a lighting system for rendering emergency lighting comprises detecting (101) a switch from a normal mode of the lighting system to an emergency mode of the lighting system and a switch from the emergency mode to the normal mode and activating (103) an emergency radio frequency-based sensing function upon detecting the switch from the normal mode to the emergency mode. The radio frequency-based sensing comprises detection of disturbances to a radio frequency field. The method further comprises deactivating (105) the emergency radio frequency-based sensing function upon detecting the switch from the emergency mode to the normal mode.

This application provides a radio interference detection method and an apparatus. The method includes: obtaining an available frequency configured for a current cell; measuring signal information of a signal received on the available frequency; and determining, based on the signal information of the signal, whether there is radio interference. The available frequency is obtained based on information about a broadcast channel, and signal strength of the available frequency of the current cell is preferentially scanned, to determine whether there is radio interference. If there is interference on the available frequency of the current cell, corresponding processing can be performed quickly. According to the application, because a relatively small quantity of frequencies are scanned preferentially, an effective interference detection speed can be increased quickly.

A method for detecting motion may include: performing at least one scanning cycle on a monitored space using a radar apparatus; detecting and identifying at least one moving object in the monitored space, including detecting an actual displacement value for each moving object detected inside the monitored space between a detection cycle and a subsequent detection cycle; providing a threshold value of maximum allowable displacement associated with every moving object detected inside the monitored space between the detection cycle and the subsequent detection cycle; locating at least one semi-static zone in the monitored space, the at least one semi-static zone corresponding to a portion of the monitored space that surrounds at least one semi-static object; and generating an alarm signal only when, in the monitored space, at least one moving object situated outside the at least one semi-static zone is detected.

An intrusion detection system for a vehicle includes a radar sensor, a calculator, and an alarm system adapted to generate an alarm, the radar sensor being adapted to detect the presence of a body within the vehicle, the calculator being adapted to categorize each detected body as either a “human” category or an “other” category and to trigger the alarm system only when at least one of the detected body(ies) is categorized as “human”. Also included is an associated vehicle and method.

There is provided a method of arranging a security alarm system on a window/door and framing. The system includes an object and a sensor which is capable of detecting the object within a predetermined range. The method includes positioning a first of the sensor and object on a first of the window/door and framing. The method includes opening the window/door to a threshold distance which facilitates ventilation and inhibits an intruder from passing through the window/door. The method includes positioning a second of the sensor and object along a second of the window/door and framing such that the sensor is able to detect the object as the window/door is opened up to but not past the threshold distance.

There is also provided in combination, a window/door, framing extending about the window/door and a security alarm system coupled to the window/door and framing in the manner described above.

The systems and method proposed herein aim to identify a mobile device or devices worn by an individual or a subject that has entered an area monitored by a passive motion detection system that uses wireless signals to sense motion in the space. The system will collect as much signals as possible from both the devices worn by the individual and from the system performing the passive (device-free) motion detection for identifying the individual or person of interest. The individual or person of interest may be a user of a product or an intruder.

There is provided a method of installing a magnetic proximity sensor including positioning the magnetic field sensor in a desired location and positioning a magnet in a desired location relative to the magnetic field sensor, with an indicator of the sensor continuing to be turned on during the predetermined period of time when the magnetic field generated by the magnet is sensed by the magnetic field sensor, and being turned off during the predetermined period of time when the magnetic field generated by the magnet is not sensed by the magnetic field sensor. The indicator light thus assists in determining proper relative positioning of the magnet and the magnetic field sensor. If after the predetermined period of time more time is needed to install the magnetic proximity sensor, the method includes initiates another predetermined period of time by removing and replacing a lid of the magnetic proximity sensor.

In a general aspect of the examples described, motion is detected based on bi-directional channel sounding. In an example, a first set of channel information is obtained from a first device. The first set of channel information is based on a first set of wireless signals transmitted from a second device through a space at a first time in a timeframe. A second set of channel information is obtained from the second device. The second set of channel information is based on a second set of wireless signals transmitted from the first device through the space at a second time in the timeframe. The first and second sets of channel information are analyzed to detect a category of motion or a location of detected motion in the space during the timeframe.

The invention relates to performing sensing in a wireless network based on detecting changes in received radio frequency signals and in particular to performing such sensing based on analyzing channel state information. The wireless network comprises at least one node of a first type arranged for performing analysis of channel state information related to wireless signals transmitted in the wireless network, and a plurality of nodes of a second type. One or more wireless signals are transmitted between the plurality of nodes of the second type, and at least one of these nodes determines channel state information, related to the one or more wireless signals, and transmits at least part of the determined channel state information to a node of the at least one node of the first type. This node of the first type receives the at least part of the determined channel state information and analyzes it to determine a sensing value.