Study on user position detection method using unmanned aerial vehicles under practical communication environment

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K04380
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21020:Communication and network engineering-related
• Research Institution: Nihon University
• Principal Investigator: ISHIKAWA Hiroyasu 日本大学, 工学部, 教授 (20536495)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 無人航空機 / ドップラーシフト / ユーザ位置検出 / 最小二乗法 / マルチパス / 三次元測位 / 周波数オフセット / 多重観測

Outline of Final Research Achievements

In the unmanned aircraft systems (UASs), several unmanned aerial vehicles (UAVs) are used to provide services over a large area. Here, the carrier frequencies of the transmitted and received signals experience Doppler shifts due to the variations in the line-of-sight velocity between the UAV and the terrestrial terminal.
This study aims to present positioning accuracy performance of the proposed user position detection system based on Doppler shift distributions considering several degradation issues such as multipath and signal attenuation caused by the influence of buildings around the user, and UAV flight position control error, frequency offsets caused by oscillators, as well as countermeasures and mitigation technologies for these degradation factors. As a result, we propose a method for estimating frequency offset and user position simultaneously and a method for improving position detection accuracy by observing Doppler shift multiple times.

Free Research Field

無線通信工学

Academic Significance and Societal Importance of the Research Achievements

無人航空機を用いた位置検出手法において、様々な劣化要因を考慮した研究開発は学術的にも意義が高く、ドップラーシフトに含まれる周波数オフセットの推定・補償手法、マルチパス環境下における位置検出精度改善のための測位演算アルゴリズムなどの研究課題は学術的に意義が高いだけでなく、本研究に基づくユーザ位置検出手法を実現できれば、災害時や緊急時、山岳地域などにおける遭難時など、携帯電話等の通常の通信手段の利用が困難な状況において、CW波の送信機能を有する簡易な端末を保有するユーザの存在位置の発見が早期かつ高精度に行うことが期待でき、人命救助という社会的な貢献の観点からも極めて意義が高いものと考えられる。