A smart wristband navigation method in the case of GPS failure

Abstract

A smart wristband navigation method in the case of GPS failure. The navigation method of the present invention is as follows: detect whether the GPS information in the wristband is available, and then perform the following steps if it is not available; obtain the acceleration, angular velocity and geomagnetic field under the wristband coordinate system through the accelerometer, gyroscope and magnetometer in the wristband Intensity information is stored; use the accelerometer information and gyroscope information stored in the bracelet to detect and segment the steps, and obtain the gait segmentation results; use the gait segmentation results and the acceleration, angular velocity and geomagnetic field strength information in the bracelet to realize the current Judgment of the pedestrian walking direction in the step; use the gait segmentation results and the acceleration information in the bracelet to estimate the pedestrian walking step length in the current step; use the gait segmentation, pedestrian walking direction, and pedestrian walking step estimation results to conduct pedestrian navigation Trace recursion. The beneficial effect is that it effectively solves the problem of pedestrian navigation and positioning in the case of GPS information failure, and realizes continuous pedestrian navigation at all times.

Description

technical field [0001] The invention relates to a pedestrian navigation and positioning method, in particular to a smart bracelet navigation method in the case of GPS failure, and belongs to the technical field of pedestrian navigation and positioning. Background technique [0002] In recent years, thanks to the rapid development of chip technology and communication technology, all kinds of wearable devices have gradually entered people's field of vision, including various smart bracelets represented by Xiaomi Mi Band, and Apple Watch. Smart watches, etc., their appearance has greatly enriched our lives, and even changed our way of life. For a smart bracelet, one of its core functions is to determine the location of a person, and then provide location-based services (LBS, Location-based Services). As the main means of obtaining spatial location information and the core technology of LBS, pedestrian positioning and navigation technology is very important. In areas where sat...

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Problems solved by technology

[0003] In order to overcome the current use of GPS information to realize pedestrian navigation and positioning, because the signal strength of the satellite signal is weak when it reaches the ground, it cannot penetrate buildings and other obstructions, and it is easy to appear in the urban environment because the GPS information cannot be received or the GPS information is insufficient. The problem of causing GPS failure, which in turn leads to the inability to realize the continuity of personnel and the lack of full-time navigation and positioning, the present invention provides a smart bracelet navigation method in the case of GPS failure

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