Detection system for the location of moving objects

• US 3,906,436 A
• Filed: 02/06/1974
• Issued: 09/16/1975
• Est. Priority Date: 02/08/1973
• Status: Expired due to Term

• Current Assignee: Kenichi Yoshida, Masataka Kuroda, Noritaka Kurauchi, Yoshinobu Kobayashi
• Original Assignee: Kenichi Yoshida, Masataka Kuroda, Noritaka Kurauchi, Yoshinobu Kobayashi
• Inventors: Kurauchi, Noritaka, Yoshida, Kenichi, Kobayashi, Yoshinobu, Kuroda, Masataka
• Primary Examiner(s): Wilbur, Maynard R.
• Assistant Examiner(s): Berger, Richard E.
• Application Number:
  US05/440,217
• Time in Patent Office: 587 Days
• Field of Search: 246/63C,122R,187B 340/23,38L,47
• US Class Current: 340/989
• CPC Class Codes: B61L 25/026 Relative localisation, e.g. using odometer
• CPC Class Codes: G01D 5/2073 by movement of a single coil with respect to two or more coils

Abstract

Radio signals generated from a transmitter mounted on a moving object are induced into a plurality of crossed pairs of lines and into a reference pair of parallel lines. The difference in phase between the signals induced in the crossed pairs and reference pair of lines is used precisely to identify the location of the moving object.

Claims

1. A system for detecting the absolute address location of a moving object by the use of inductive radio comprising;

1. n pairs of crossing pairs of lines each having crossing period of l1 X 2n (n 1, 2, 3, . . .) and by which all of the addresses of 2n locations can be represented in a manner different with each other, the unit length of the address being l1;

2. a parallel pair of lines which is not crossed;

3. means for generating high frequency signals mounted on the moving object;

4. an antenna supplied with high frequency signals from said high frequency generating means and electromagnetically coupling said signals to said n pairs of crossing pair of lines and one parallel pair of lines;

5. (n +

     1) circuits which are connected respectively to the ends of said n pairs of crossing pairs of lines and said one parallel pair of lines, and receivng and amplifying high frequency signals;

6. n phase detectors which are connected to said receiving and amplifying circuits and comparing the phase of the signal received on each crossing pair of lines and that on the parallel pair of lines; and

7. registers connected to said phase detectors and storing binary signals '"'"''"'"''"'"''"'"'1'"'"''"'"''"'"''"'"' and '"'"''"'"''"'"''"'"'0'"'"''"'"''"'"''"'"' corresponding respectively to the state in same phase or in the opposite phase;

thereby comparing the phase of the signals, induced from said moving object and received by said n pairs of crossing pairs of lines with that received on said one parallel pair of lines to detect the binary coded absolute address.

2. n pairs of crossing pairs of lines in which the crossing points with period of a are eliminated at the address boundaries on every interval of l1 X 2n (n 1, 2, 3 . . . , l1 address length) and by which all of the addresses less than 2n are represented in a way different from each other;

3. means for generating high frequency signals mounted on the moving object;

4. an antenna supplied with the high frequency signals from said high frequency signal generating means and coupling electromagnetically to said n pairs of crossing pair of lines and to one reference crossing pair of lines;

5. (n + 1) circuits which are connected respectively to the ends of said n pairs of crossing pairs of lines and said one parallel pair of lines, and receivng and amplifying high frequency signals;

6. n phase detectors connected to said receiving and amplifying circuits and comparing the phase of the signal received on one reference crossing pair of lines with that of the signal received on each of said n crossing pairs;

and

7. registers connected to said phase detectors and storing binary signals '"'"''"'"''"'"''"'"'1'"'"''"'"''"'"''"'"' and '"'"''"'"''"'"''"'"'0'"'"''"'"''"'"''"'"' corresponding respectively to the state in same phase or in the opposite phase;

thereby comparing the phase of the signals, induced from said moving object and received by said n pairs of crossing pairs of lines with that received on said one parallel pair of lines to detect the binary coded absolute address.