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.

This disclosure relates generally to tracking motion of target in indoor environment. The method includes estimating an initial position of the target in a mesh grid form based on radar data captured from radar devices installed in the indoor environment. For a subsequent target movement, a subsequent position of the target is estimated in the mesh grid form based on the initial position and a resultant velocity vector of the target. A number of outlier grid-points is computed with a threshold number, and based on comparison the outlier grid-points are either replaced with interpolated grid-points or the subsequent position of the target is repaired based on a probable position of the target obtained from at least one of a linear regression based analysis of prior positions of the target, prior knowledge of the target velocity and sampling interval, and a trilateration based technique.

One or more techniques and/or systems are disclosed for alerting workers in a work zone of a potential intrusion by a vehicle. The example system can comprise a detection unit operable to mount to a work zone boundary marker. The detection unit can monitor the work zone for intrusion by moving objects, such as by using the Doppler Effect. The detection unit can transmit an alarm signal to one or more personnel alerters, such as worn by workers. The personnel alerters can receive the alarm signal and activate an alert, such as an audible, visual, or other sensory alert. In this way, an alert is provided to personnel working in an established work zone that a moving object, such as a vehicle, has penetrated the work zone perimeter. This type of alert may provide the personnel the vital seconds needed to move to safety.

A vehicle occupant detection system and method for using the same. The vehicle occupant detection system includes: a controller; a plurality of life detection sensors, wherein the plurality of life detection sensors are installed within an interior cabin of a mass-transit vehicle and are each associated with a life detection zone; a local warning system having at least one human-machine interface (HMI) output device; and a vehicle interface that communicatively couples the controller to a vehicle electrical system of the mass-transit vehicle. The vehicle occupant detection system is configured to: (i) acquire sensor data by scanning the life detection zone using the plurality of life detection sensors; (ii) determine whether an occupant is present based on the sensor data; and (iii) provide an indication to a user that an occupant is present using the HMI output device when it is determined that an occupant is present.

For a measurement period, signal strengths, device identifiers and access point identifiers are received from a plurality of access points. A record for the measurement period is stored in random access memory with the record being associated with a single device identifier and containing access point identifiers associated with signal strengths received for the measurement period. The location of a device is determined for the measurement period by retrieving spatial coordinates of a corresponding access point for each access point identifier in the record for the measurement period and setting the location of the device for the measurement period to the average of the retrieved spatial coordinates.

A method of detecting leakage, comprising the steps of: performing a sequence of monitoring operations; and providing, when it is determined that leakage is present, a signal indicative of detected leakage. Each monitoring operation includes the steps of: generating a transmit signal exhibiting a time-varying frequency; receiving a reflection signal resulting from reflection of the transmit signal at the surface; forming an intermediate frequency signal for the present monitoring operation based on the transmit signal and the reflection signal; determining a phase of the intermediate frequency signal for the present monitoring operation; determining, based on the phase for the present monitoring operation and the phase associated with at least one previous monitoring operation, a measure indicative of a present rate of change of the phase; comparing the measure with a predefined threshold value; and determining a presence of leakage based on the comparison.

According to one embodiment, a system includes a radar device, a storage device and a controller. The radar device is configured to transmit a first radio wave to an object in a direction of a first angle of the object. The storage device is configured to store first information capable of specifying that a radio wave is transmitted to the first angle of the object by the radar device. The controller is configured to control a direction of a second radio wave to be transmitted by the radar device after the transmission of the first radio wave to a second angle of the object different from the first angle.

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.

A fall detection system includes a radar that generates emitting radio waves and receives reflected radio waves from a person under detection, a data generator that generates a point cloud according to the reflected radio waves, an area determining device that determines a sub-area of a detecting area in which the person under detection lies, and a classifier that determines whether the person under detection falls according to the point cloud. The classifier adaptively processes the point cloud with different methods according to sub-areas as determined by the area determining device respectively to determine whether the person under detection falls.

A communication system that performs first communication and second communication, which differs from the first communication, through wireless connection between a terminal and a communication peer, is provided. The communication system includes communication devices arranged in the communication peer. At least one of the communication devices performs the second communication. The communication devices include a first communication device and a second communication device, which differs from the first communication device. The first communication device is connected to a controller that controls the communication devices, and the second communication device is connected to the first communication device.