Claims
- 1. A wireless type searching system comprising:
- a portable radio unit mounted on an object for transmitting a radio signal having a predetermined frequency;
- a plurality of searching radio units installed at a corresponding plurality of searching base stations for receiving said radio signal transmitted from said portable radio unit;
- position defining means for determining a position of the object based on at least two transmission directions of said radio signal received by said searching radio units installed at at least two of said base stations and on a distance between the searching base stations;
- image display means for displaying as an image said position of the object defined by said position defining means;
- said searching radio units transmitting another radio signal different from said radio signal having said predetermined frequency; and
- said portable radio unit transmitting said radio signal having said predetermined frequency to said plurality of searching points when an input level of said different radio signal transmitted from said searching radio units becomes lower than a predetermined value.
Priority Claims (3)
Number |
Date |
Country |
Kind |
5-53488 |
Oct 1993 |
JPX |
|
5-56983 |
Oct 1993 |
JPX |
|
5-70092 |
Dec 1993 |
JPX |
|
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation of application Ser. No. 08/399,552 filed Mar. 7, 1995 and now abandoned which itself is a Continuation-in-Part of copending application Ser. No. 08/301,643 filed Sep. 7, 1994 entitled "SYSTEM FOR MONITORING A WEAK-MINDED PERSON" also abandoned.
US Referenced Citations (5)
Continuations (1)
|
Number |
Date |
Country |
Parent |
399552 |
Mar 1995 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
301643 |
Sep 1994 |
|