Capon beamforming-based positioning method and device

Abstract

The invention provides a Capon beamforming-based positioning method and device. According to the Capon beamforming-based positioning method and device, K receiving antennas are set to form a signal receiving array, and M signal transmitting points are set; a covariance matrix Rxx is calculated by using a signal matrix outputted by the signal receiving array; the constraint optimization problem of the linearly constraint minimum variance criterion is solved, so that a spectral function can be constructed; M maximum spectral peaks are searched; and a direction of arrival is calculated. According to the method, beacon points deployed in a monitoring area are adopted to be networked with a wireless gateway so as to communicate with the wireless gateway; data are transmitted to a cloud end through a wireless communication module; cooperative sensing is performed, and the information of signal transmitting points in a network coverage area is acquired and positioned; the monitoring data of the cloud end are matched with a map and the like, so that intelligent parking can be realized. With the method adopted, the number of vehicles does not need to be known in advance or estimated, and therefore sampling data length can be decreased; desired signals are enhanced, interference is suppressed, and therefore, the signal to interference plus noise ratio of the output of a system can be improved; and a robust Capon algorithm is modified to improve the deviation of a direction vector from an actual environment, and therefore, positioning performance can be improved.

Description

technical field [0001] The invention relates to a positioning method and device based on Capon beamforming. Background technique [0002] With the increase of personal vehicles, it is now a big problem to find cars in the reverse direction. Sometimes you can’t find a parking spot after turning around a few times. Some shopping malls and communities have underground parking lots, which increases a lot of parking spaces. But some friends are reluctant to park their cars in the underground parking lot. The reason is that they are not familiar with the parking rules of the parking lot at the address. It is difficult to find a car when parking. This has become one of the common problems encountered in life. How to efficiently find a car in reverse, through real-time monitoring and effective positioning control measures, can effectively solve the problem of parking and finding a car. [0003] The existing ultrasonic positioning has a high overall positioning accuracy and a simple...

AI Technical Summary

Problems solved by technology

It is also possible to use the "proximity method" to roughly determine which reference node the terminal is near. This method has low positioning accuracy and is not common in practical applications.

Images