Navigation system

Abstract

Abstract PURPOSE:To prevent deterioration in position measurement precision due to blocking by finding the position of a GPS satellite user by utilizing a range finder which finds the moving direction of a moving body on the basis of information on handle rotation, and displaying it on a map display device. CONSTITUTION:A transmission signal from a GPS satellite is received by an antenna a and a signal demodulated by a GPS receiver 2 is sent to a position measuring computer 3 which finds the three-dimensional position and time of the user. Its signal is distributed and one signal is sent to a monitoring device 4 for the number of acquired satellites. The moving body is moved firstly so that the number of acquired satellites is four and the computer 3 finds the position of the user. A CPU 8, on the other hand, reads map information out of a map recording device 7 and displays it on a display device 9 together with the found position of the user. Then, when a decrease inn the number of acquired satellites to three because of the presence of a building is detected, the range finder 6 is used and when the number of acquired satellites decreases to two, the range finder 6 and a handle information detecting device are used, thereby measuring the three-dimensional position. Consequently, the deterioration in the position measurement precision due to blocking is prevented and the position measurement precision is secured.

Inventors

• 👤 Hisao Iwasaki
• 👤 久雄 岩崎
• 👤 Yoshihiko Mikuni
• 👤 三国　良彦

Bibliographic Details