Longguan Zhang

Title: Longguan Zhang and 3D Positioning for Subway Construction

Introduction

Longguan Zhang is an inventor associated with Chengdu, China, and China Railway Engineering Services Co., Ltd. His patent work addresses three-dimensional positioning at subway construction sites, where reliable location data can support operations in complex shaft environments.

Latest Patents

Zhang is associated with 1 patent: “Method and System for Three Dimensional Positioning in Subway Construction Site, and Medium.” The invention describes a method for locating a positioning tag within a subway construction shaft.

The method establishes a three-dimensional coordinate system for the shaft and determines the coordinates of ultra-wideband (UWB) base stations installed at different levels. The base stations measure the tag’s distance, and the system filters out erroneous ranging data. It then divides the coordinate space into equal cube grids, selects a preset number of base stations based on the filtered measurements, and calculates a position record for each grid using the selected stations’ coordinates, ranging data, and grid-center coordinates. Finally, it uses voting across the grid-based records to determine the tag’s concluding position.

Career Highlights

Zhang’s listed patent focuses on combining UWB measurements, data filtering, and grid-based voting to determine a position in a multi-level construction shaft. This approach is designed for the distinctive spatial conditions of subway construction sites.

Collaborations

Zhang is associated with China Railway Engineering Services Co., Ltd. His listed coworkers include Ke Chen and Suimei Liu.

Conclusion

Longguan Zhang’s patent presents a structured approach to three-dimensional positioning in subway construction, using filtered UWB measurements and voting across spatial grids to estimate a positioning tag’s location.