Abstract: An electronic device may include radio-frequency sensing circuitry that transmits sensing signals and that receives reflected signals using one or more antennas. The sensing circuitry may generate digital sensor data based on the reflected signals. The sensor data may be indicative of moving objects moving through positions that occlude lines of sight between the electronic device and stationary objects behind the moving objects. The sensor circuitry may detect the locations on the stationary objects based on changes to the sensor data associated with motion of the moving objects through the positions. The sensor circuitry may accumulate an environment map of the detected locations as the moving objects move about the environment over time. This may allow the sensor circuitry to generate the environment map with high spatial resolution using as few antennas as possible. The sensor circuitry may detect boundaries of the environment based on the environment map.

Abstract: Techniques are disclosed for cross-polarization-based object detection and classification. One example includes a system implemented for cross-polarization-based object detection and classification. The system includes a first transmitter antenna configured for radiating a first millimeter wave electromagnetic signal, where the first millimeter wave electromagnetic signal including a first polarization. The system further includes a first receiver antenna configured for receiving a second millimeter wave electromagnetic signal, the second millimeter wave electromagnetic signal including a second polarization. The system further includes a processing circuitry configured to detect an object based at least in part on the second millimeter wave electromagnetic signal, the object being impacted by the first millimeter wave electromagnetic signal to cause the second millimeter wave electromagnetic signal to reflect off the object.

Abstract: Disclosed is a postoperative functional exerciser for frozen shoulder. The exerciser includes a hand push rod (1) and a restrictive band (2) for restricting the elbow. The hand push rod (1) comprises a wristband (11) and a push rod (12). One end of the push rod (12) is connected with the wristband (11). When the hand push rod (1) and the restrictive band (2) are in operation, a part of the restrictive band (2) winds around the elbow joint of an affected arm, the other part winds around a waist buckle (3) at a waist portion of the restrictive band (2) on a side opposite to the affected arm, and the wristband (11) is sleeved on the wrist of the affected arm. The upper arm is tied to the body by means of the restrictive band (2).

Abstract: Disclosed is a postoperative functional exerciser for frozen shoulder. The exerciser includes a hand push rod (1) and a restrictive band (2) for restricting the elbow. The hand push rod (1) comprises a wristband (11) and a push rod (12). One end of the push rod (12) is connected with the wristband (11). When the hand push rod (1) and the restrictive band (2) are in operation, a part of the restrictive band (2) winds around the elbow joint of an affected arm, the other part winds around a waist buckle (3) at a waist portion of the restrictive band (2) on a side opposite to the affected arm, and the wristband (11) is sleeved on the wrist of the affected arm. The upper arm is tied to the body by means of the restrictive band (2).