Intelligent bracelet navigation method under condition of GPS failure

Abstract

The invention discloses an intelligent bracelet navigation method under the condition of GPS failure. The navigation method comprises the following steps: detecting whether GPS information in a bracelet is available or not; if not, executing the following steps; acquiring and storing acceleration, angular velocity and geomagnetic field intensity information under a bracelet coordinate system through an accelerometer, a gyroscope and a magnetometer in the bracelet; carrying out step detection and segmentation by using the accelerometer information and gyroscope information stored in the bracelet to obtain a gait segmentation result; with the gait segmentation result and the acceleration, angular velocity and geomagnetic field intensity information in the bracelet, realizing determination ofa walking direction of a pedestrian in the current step; realizing estimation of a walking step length of the pedestrian in the current step by using the gait segmentation result and the accelerationinformation in the bracelet; and carrying out pedestrian track recursion by using gait segmentation, pedestrian walking direction and pedestrian walking step length estimation results. The method hasthe following beneficial effects: a problem of pedestrian navigation and positioning under the condition of GPS information failure is effectively solved and the all-time coherent pedestrian navigation is realized.

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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