GPS signal anti-drift method based on optical flow method

A GPS signal and anti-drift technology, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve the problems of not meeting the positioning accuracy requirements and robust drift information
CN109975844AActive Publication Date: 2019-07-05ZHEJIANG UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2019-07-05

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Abstract

The invention discloses a GPS signal anti-drift method based on an optical flow method. The GPS signal anti-drift method adopts unscented Kalman filtering for fusing a GPS positioning result with vehicle position information estimated by adopting the optical flow method, and realizes the real-time vehicle high-precision positioning for a long time. When calculating the vehicle speed information byadopting the optical flow method, the noise point is effectively filtered according to the actual driving road scene and the vehicle driving condition, thus the measurement precision of vehicle speedis improved. In the process of correcting the GPS signal, the GPS signal anti-drift method utilizes the constraint information of the vehicle driving direction to correct the GPS signal, thereby further reducing the influence of GPS signal drift on the vehicle positioning.
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Description

technical field

[0001] The invention belongs to the technical field of positioning perception of smart cars, and in particular relates to a GPS signal anti-drift method based on an optical flow method. Background technique

[0002] Whether the positioning is accurate is crucial to whether the driver can efficiently plan the route to the destination. At present, in the automotive field, the most widely used positioning method is mainly based on the GPS positioning method. However, due to the problems of ionospheric delay, multipath reflection effect and extremely poor signal when the tunnel is blocked by GPS, relying on GPS signal alone is not enough to meet the driver's requirements for precise positioning. In recent years, differential GPS obtains the correction amount of GPS signals at nearby locations by building a differential GPS reference station, and then sends the correction amount to the user's GPS receiver to correct the user's GPS data, which greatly improves the ...

Claims

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