http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A Study of the Possibility of Positioning Using Small Number of Satellite
Masashi Yonekawa,Toshiyuki Tanaka 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Nowadays, positioning system using satellite is used in car-navigation, the cellular phone and the survey work. In addition, the demand of use is high. But, a new usage of satellite positioning has not been announced since then. One of the reasons, which is also the biggest problem, is because that positioning method is difficult to use. The positioning system using satellite requires more than four satellites. We consider the conditions of general living environments. The condition where the sky is completely free from obstacles is rare because obstacles like buildings, trees and etc are commonly present in our daily life environment. Therefore, it is difficult to always meet the requirement of more than 4 satellites. We study the ongoing possibility of positioning using less than four satellites. Whether or not the measurement was possible by four data was examined in this paper. If the data of the same satellite is used, the error margin grows.
Method for accuracy improvement of GPS measurement in the city
Takashi Matsushita,Toshiyuki Tanaka,Masashi Yonekawa 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
GPS (Global positioning System) is a 3-D positioning system using space satellites. Recently, the use of GPSin the city as the navigation system is rising continuously. However the measurement error is large when the receiver isused near the buildings such as in urban canyon. This reason is that the receiver is not able to measure a pseudo range accurately because of receiving reflected wave (multipath) from the obstacle. Then we suggested new methods for reducing the multipath error. They are methods which are discrimination of the presence of the multipath error using the signal strength, and calculating the multipath error using two kinds of measurements. We devised methods of positioning which does not require reference station in real time. In this paper, we show the effectiveness of our method with measurement results.