Anti-theft method using millimeter wave sensing technology and detachable millimeter wave sensing device

Abstract

This invention provides an anti-theft method and a detachable millimeter-wave sensing device using millimeter-wave sensing technology. The method includes: after the detachable millimeter-wave sensing device is activated, scanning the current environmental features in a first direction using a first antenna group; determining whether the current environmental features match preset installation environmental features; in response to determining that the current environmental features match the preset installation environmental features, activating a second antenna group to scan the environment where the detachable millimeter-wave sensing device is located in a second direction; and in response to determining that the current environmental features do not match the preset installation environmental features, disabling the second antenna group.

Claims

1. A theft prevention method using millimeter-wave sensing technology, executed by a detachable millimeter-wave sensing device including a first antenna group and a second antenna group, the method comprising: After the detachable millimeter-wave sensing device is activated, it scans the current environmental features in a first direction through the first antenna group. Determine whether the current environmental characteristics match the preset installation environment characteristics; if the current environmental characteristics match the preset installation environment characteristics, enable the second antenna group to scan the environment where the detachable millimeter-wave sensing device is located in the second direction; and if the current environmental characteristics do not match the preset installation environment characteristics, disable the second antenna group.

2. The method as described in claim 1, further comprising: In response to the determination that the detachable millimeter-wave sensing device has been initially activated, it scans the current installation environment features in the first direction through the first antenna group and stores the current installation environment features as the preset installation environment features.

3. The method as described in claim 2, wherein the detachable millimeter-wave sensing device is mounted on a vehicle, the first direction faces the vehicle, and scanning the current installation environment features through the first antenna group includes: The installation location characteristics of the detachable millimeter-wave sensing device on the vehicle are scanned by the first antenna group toward the first direction to serve as the current installation environment characteristics.

4. The method as described in claim 1, wherein the current environmental feature is characterized as a first millimeter-wave point cloud, the preset installation environment feature is characterized as a second millimeter-wave point cloud, and determining whether the current environmental feature matches the preset installation environment feature includes: Detect the first similarity between the first millimeter-wave point cloud and the second millimeter-wave point cloud; The system determines that the current environmental feature matches the preset installation environment feature if the first similarity is higher than the first preset threshold; and it determines that the current environmental feature does not match the preset installation environment feature if the first similarity is not higher than the first preset threshold.

5. The method as described in claim 1, wherein the first antenna group comprises one transmitting antenna and two receiving antennas.

6. The method of claim 1, wherein the detachable millimeter-wave sensing device is paired with a control device, and further comprises, after disabling the second antenna group: In response to receiving an unlock command from the control device, the second antenna group is deactivated.

7. The method as described in claim 1, wherein the first direction is opposite to the second direction, and the scanning distance of the first antenna group is less than the scanning distance of the second antenna group.

8. The method as described in claim 1, wherein the current environmental features include current multi-frequency environmental features corresponding to multiple sub-bands, and scanning the current environmental features in a first direction through the first antenna group includes: Scanning in the first direction based on each of the sub-frequency bands to obtain the current multi-frequency environment characteristics corresponding to the plurality of sub-frequency bands.

9. The method as described in claim 1, wherein the current environmental feature is characterized as a first millimeter-wave point cloud formed by a plurality of first reflection points, and the preset installation environment feature is characterized as a second millimeter-wave point cloud formed by a plurality of second reflection points, and determining whether the current environmental feature matches the preset installation environment feature includes: Detect the first similarity between the first millimeter-wave point cloud and the second millimeter-wave point cloud; The system detects a first intensity feature distribution of the plurality of first reflection points and a second intensity feature distribution of the plurality of second reflection points; determines a second similarity between the first intensity feature distribution and the second intensity feature distribution; determines that the current environmental feature matches the preset installation environment feature if the first similarity is higher than a first preset threshold and the second similarity is higher than a second preset threshold; and determines that the current environmental feature does not match the preset installation environment feature if the first similarity is not higher than the first preset threshold or the second similarity is not higher than the second preset threshold.

10. The method as described in claim 1, wherein the current environmental features include a first millimeter-wave point cloud and a first phase feature, the preset installation environment features include a second millimeter-wave point cloud and a second phase feature, and determining whether the current environmental features match the preset installation environment features includes: Detect the first similarity between the first millimeter-wave point cloud and the second millimeter-wave point cloud; Detect the phase similarity between the first phase feature and the second phase feature; react to determining that the first similarity is higher than a first preset threshold and the phase similarity is higher than a preset phase threshold, and determine that the current environment feature matches the preset installation environment feature; and react to determining that the first similarity is not higher than the first preset threshold or the phase similarity is not higher than the preset phase threshold, and determine that the current environment feature does not match the preset installation environment feature.

11. A detachable millimeter-wave sensing device, comprising: First antenna group; Second antenna group; A switching circuit is coupled to the first antenna group and the second antenna group; The processor, coupled to the switching circuit and configured to perform: upon startup of the detachable millimeter-wave sensing device, controlling the switching circuit to enable the first antenna group to scan current environmental features in a first direction; determining whether the current environmental features match preset installation environmental features; in response to determining that the current environmental features match the preset installation environmental features, controlling the switching circuit to enable the second antenna group to scan the environment where the detachable millimeter-wave sensing device is located in a second direction; and in response to determining that the current environmental features do not match the preset installation environmental features, controlling the switching circuit to disable the second antenna group.

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