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A positioning method and X-axis technology, applied in the automotive field, can solve problems such as real vehicle interference, insufficient positioning accuracy, and BLE signal strength fluctuations, and achieve the effect of eliminating the influence of RSSI signal fluctuations and improving positioning accuracy.
Pending Publication Date: 2022-04-12
LIANCHUANG AUTOMOBILE ELECTRONICS
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[0003] TBOX cost control is becoming more and more stringent. The positioning solution based on multiple Bluetooth and multiple antennas cannot meet the strict cost control requirements. The Bluetooth positioning solution based on single antenna has become the first choice of OEMs.
However, the single-antenna Bluetooth positioning solution has the problem of insufficient positioning accuracy. The main factors are BLE signal strength fluctuations and real vehicle interference. There is no solution yet.
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no. 1 example ；
[0046] The present invention provides a TBOX BLE-RSSI positioning method, comprising the following steps:
[0047] S1, providing BLE real vehicle calibration environment;
[0048] S2, specify the distance parameter and angle parameter of the actual vehicle calibration sampling point;
[0049] Taking TBOX as the origin, the direction of the front and rear of the car is the Y axis, and the direction perpendicular to the front and rear of the car is the X axis; the distance parameter is the distance between the calibration sampling point and the origin; the angle parameter is the angle between the calibration sampling point and the X axis;
[0050] S3, calculate the RSSI of the calibration sampling point according to the distance parameter and the angle parameter, specify the weight of each calibration sampling point according to the angle parameter, carry out weighted calculation to the RSSI of the calibration sampling point, and obtain the distance range positioning parameter; ...
no. 2 example ；
[0056] The present invention provides a TBOX BLE-RSSI positioning method, comprising the following steps:
[0057] S1, providing a BLE real vehicle calibration environment; the real vehicle calibration environment is different according to the requirements of each manufacturer, this embodiment exemplarily provides an optimal BLE real vehicle calibration environment; the frequency of the BLE signal is 2.4GHz, and the wavelength is relatively short. Susceptible to interference from the external environment. In order to ensure the calibration accuracy, the environment of the Bluetooth communication distance test needs to be standardized to ensure the reliability of the test results.
[0058] (1) TBOX installation position specification;
[0059] The TBOX needs to be installed in the glove box with a bracket, and the TBOX shell must be complete and the glove box shell installed.
[0060] (2) Test the location and orientation of the mobile phone
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Abstract
The invention discloses a TBOX BLE-RSSI positioning method. The TBOX BLE-RSSI positioning method comprises the following steps: providing a BLE real vehicle calibration environment; appointing a distance parameter and an angle parameter of a real vehicle calibration sampling point; calculating RSSI of the calibration sampling points according to the distance parameters and the angle parameters, assigning RSSI weights of the calibration sampling points according to the angle parameters, and performing weighted calculation on the RSSI of the calibration sampling points to obtain distance range positioning parameters; reading the calibration sampling point RSSI from the Bluetooth protocol stack according to a specified period, and extracting the calibration sampling point RSSI at the current moment and a plurality of adjacent sampling periods before; discrete Gaussian filtering is carried out on the extracted RSSI of the calibration sampling point; and judging which distance range the current test piece position belongs to according to the distance range positioning parameter, and further determining which functional area the current test piece position belongs to. According to the method, through combination of discretized Gaussian filtering and real vehicle calibration, the distance range can be identified, the positioning precision can be improved under the condition of not increasing extra cost, and the influence of RSSI signal fluctuation is reduced to a certain extent.
Description
technical field [0001] The invention relates to the field of automobiles, in particular to a TBOX BLE-RSSI positioning method. Background technique [0002] With the widespread popularization of Bluetooth Low Energy (BLE) technology in automobiles and mobile terminals, the use of BLE technology to implement digital keys has formed a large-scale market. BLE-based positioning is an important part of the digital key. Currently, BLE supports multiple positioning methods such as AOA / AOD / TOF / RSSI. Although the RSSI positioning algorithm is not as accurate as AOA / AOD / TOF, its advantages are single antenna and low cost, so it has become one of the important choices for OEMs. [0003] TBOX cost control is becoming more and more stringent. The positioning solution based on multiple Bluetooth and multiple antennas cannot meet the strict cost control requirements. The Bluetooth positioning solution based on single antenna has become the first choice of OEMs. However, the single-anten...
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