Closed-field positioning and distress call device

Abstract

A closed-field positioning and distress call device includes a processing module, an input module, an inertial measurement module, and an alert module. The input module receives a first location immediately. The processing module compares the first location with a specified location in each pre-stored guidance route data set. If the comparison matches, the processing module generates recommended route data based on the guidance route data corresponding to the specified location, wherein the recommended route data includes a starting location and a landmark location. The processing module continuously receives complex sets of acceleration data and complex sets of angular velocity data from the inertial measurement module from the first instant to obtain the current location and travel time. The processing module calculates the distance between the current location and the landmark location; if the distance is greater than a preset distance range and the travel time is equal to a preset travel time, the alert module generates an alert.

Claims

1. A closed-field positioning and distress call device, comprising: a transmission module for receiving field map data; a processing module connected to the transmission module; a storage module connected to the processing module and storing the field map data, wherein the field map data includes a plurality of guide route data, each guide route data including a designated location; an input module connected to the processing module, wherein the input module receives a first location at a first time; wherein the processing module compares the first location with the designated location of each guide route data stored in the storage module, and when the comparison matches, generates a recommended route data based on the guide route data corresponding to the designated location, the recommended route data including a starting location and a landmark location; and an inertial measurement module connected to the processing module. The processing module continuously receives complex sets of acceleration data and complex sets of angular velocity data from the inertial measurement module starting at the first time, and obtains a current position and a movement time based on the starting position, the sets of acceleration data and the sets of angular velocity data; the processing module calculates a distance between the current position and the landmark position in the recommended route data, and generates an alarm command when the distance is greater than a preset distance range and the movement time is equal to a preset movement time; and an alarm module is connected to the processing module, wherein the alarm module generates an alarm based on the alarm command.

2. The closed-area location distress call device as described in claim 1, wherein the input module includes a camera connected to the processing module; wherein the camera captures a first image at a first time and a second image at a second time; the processing module obtains a first position and a second position based on the first image and the second image respectively, and corrects the current position based on the second position to obtain a corrected position; and the processing module calculates the distance between the corrected position and the landmark position in the recommended route data; and generates an alert command when the distance is greater than a preset distance range.

3. The closed-field location distress call device as described in claim 2, wherein the processing module compares the data of the second location with the first location, and generates the warning command when the comparison matches.

4. The closed-area location distress signaling device as described in claim 2, wherein the warning module includes a voice player connected to the processing module; and the camera receives an instruction image, the processing module obtains instruction text data based on the instruction image, and the voice player plays an instruction warning based on the instruction text data.

5. The closed-area location distress call device as described in claim 1, wherein the input module receives a parking space number at the first moment, and the processing module obtains the first location based on the parking space number.

6. The closed-field positioning and distress call device as described in claim 1, wherein the processing module calculates an angular velocity change amplitude and an acceleration change amplitude for each time window based on the sets of acceleration data and the sets of angular velocity data; wherein when the angular velocity change amplitude within the time window is less than an angular velocity threshold, the acceleration change amplitude is less than an acceleration threshold, and the movement time is greater than a preset standstill time, the processing module generates a device standstill command; and the warning module generates a warning based on the device standstill command.

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