Position measuring system using pseudo-noise signal transmission and reception
First Claim
1. A system for measuring a position of a first moving object in a limited area, said system comprising:
- a first transmitter provided on the first moving object for repeatedly transmitting a first pseudo-noise signal, transmission of said first signal repeated at a first time interval equal to a first period;
a plurality of stations located at predetermined coordinates in the limited area, each of said stations including;
receiving means for receiving said first signals from said transmitter,detection means for detecting when a first signal is received by said receiving means,generation means for generating a correlative pulse when a first signal is detected by said detecting means, wherein each station produces a correlative pulse when that station receives a first signal,means for transmitting the correlative pulses from each of the stations to a delay detection means;
said delay detection means for detecting time differences of less than said first period between reception of a first correlative pulse signal generated by a first station and a subsequent correlative pulses generated by each of the remaining stations; and
control means for calculating coordinates of the position of said first moving object based on the detected time differences supplied by said delay detecting means and predetermined time delays associated with transmission of correlative pulses from each station to said delay detection means due to the predetermined coordinates of each of the stations in the area and the coordinates of the delay detection means.
1 Assignment
0 Petitions
Accused Products
Abstract
A system for measuring a position of an object moving in a limited area includes a transmitter provided on the moving object for periodically transmitting pseudo-noise signals at time intervals in accordance with an intrinsic period assigned to the object, and a plurality of stations located at predetermined coordinates, each of the stations including a receiving part for receiving the signals so that pulse signals whose period is matched with the intrinsic period are output, and a detecting part for detecting correlative pulses from the pulse signals. The system further includes a delay detecting part for detecting a time difference between reception of a first correlative signal by one of the stations and reception of each of the subsequent correlative pulses by the other stations, and a control part for calculating coordinates of the position of the moving object based on the time differences and based on the given coordinates of the stations, so that the calculated coordinates of the position are output.
146 Citations
10 Claims
-
1. A system for measuring a position of a first moving object in a limited area, said system comprising:
-
a first transmitter provided on the first moving object for repeatedly transmitting a first pseudo-noise signal, transmission of said first signal repeated at a first time interval equal to a first period; a plurality of stations located at predetermined coordinates in the limited area, each of said stations including; receiving means for receiving said first signals from said transmitter, detection means for detecting when a first signal is received by said receiving means, generation means for generating a correlative pulse when a first signal is detected by said detecting means, wherein each station produces a correlative pulse when that station receives a first signal, means for transmitting the correlative pulses from each of the stations to a delay detection means; said delay detection means for detecting time differences of less than said first period between reception of a first correlative pulse signal generated by a first station and a subsequent correlative pulses generated by each of the remaining stations; and control means for calculating coordinates of the position of said first moving object based on the detected time differences supplied by said delay detecting means and predetermined time delays associated with transmission of correlative pulses from each station to said delay detection means due to the predetermined coordinates of each of the stations in the area and the coordinates of the delay detection means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification