2020 BRN Discussion, page-23385

Hi BarrelSitter
Perhaps the patent supporting this Socionext interest in radar sensors could determine whether AKIDA might be able to laying a part:


MAXIMIZE SENSING ACCURACY USING RADARIdeal for Everyday Applications with Advanced Calibration Features for Preventing Detection ErrorsApplication NoteOverviewA sensor device that triggers a certain function when an object is either present or not may sound simple. But in reality, there are numerous factors to consider in order to avoid false positive readings or detection errors. These can include failure to detect object presence and false positives when the sensor mistakenly senses a presence within the alert zone even when there is no actual objectUse CasesIn this article, we will examine various scenarios and analyze howRADARsensingisappliedandtheadvantagesassociated with its use.Distance MeasurementDistance measurement is an added advantage when power conservation is concerned, particularly with battery operated sensing devices. RADAR offers multiple zone-based settings. What this means is that specific distance can be pre-calibrated so that the sensor, when combined with an MCU, can remain at a sleep/stand-by mode and becomeactivated once an object/person enters into the specified zone and distance. This saves energy and is especially beneficial because image recordings can consume enormous amount of power if they are running all the time. Having the distance calibrated in advance, RADAR integrated with camera - allows the camera to remain idle and starts video recording once an object enters into the defined area.Angle Entry DetectionHaving the angular measurement capability can add an extra level of security. Most motion sensors are designed to detect objects entering the Field of View (FOV) but the kind of data they are able to generate can make a big difference in the interpretation of that data. The commonly used Passive Infrared (PIR) sensor is only able to trigger simple actions such as objects coming in and out of the FOV – aka “the sensing zone”. However, with RADAR, additional data can be captured, such as the angle of entry, as well as recorded images when combined with a camera. Figure 1. The diagram illustrates how the angle entry and distance measurement with zone set up can be utilized by the unique properties of RADAR sensor.Application Note 2Large Movement DetectionLarge movement can be defined as relatively large dis- placement of an object and usually involves a displacement measured in feet and not in inches. Applications used in large movement detection include tracking number of people in and out of a building or counting the number of vehicles in and out of a garage within the allowable range. RADAR, in addition to having a wide range of advantages mentioned earlier, makes it a far more favorable technology for large movement detection. It minimizes power usage, reduces false alarms with defined distance, and provides added intelligence with angle-of-entry data.Micro Movement DetectionMicro movement is especially important for in-home controlapplications (Figure 2 & 3). In earlier sensor technology such as PIR, micro movement detection does not exist, as it relies on large movement for object detection and a pre-set timer to control the light fixtures. This kind of control often causes the lights to inadvertently turn off even when a space is occupied by people who aren’t moving much. Micro movement detection can effectively control a wide variety of home fixtures and devices.The two figures below (Figures 4 & 5) illustrate the micro and large movement detection. Large movement like walking, sit down movements are being detected by both PIR and RADAR (Figure 4). While the micro movement are only detected by RADAR (Figure