[54] SYSTEM AND METHOD OF MEASURING ELECTRIC FIELD STRENGTH
[75] Inventors: Kenji Sasaki; Masaaki Nagai, both of Kanagawa-ken, Japan
[73] Assignee: Leader Electronics Corp., Yokohama, Japan
[21] Appl. No.: 08/812,955
[22] Filed: Mar. 5, 1997
[30] Foreign Application Priority Data
Mar. 6, 1996 [JP] Japan 8-048938
[51] Int. CI.6 H04Q 7/20
[52] U.S. CI 455/423; 455/67.1; 455/456;
455/457
[58] Field of Search 455/422, 423,
455/424, 425, 427, 456, 457, 67.1; 342/126,
357, 453, 457
[56] References Cited
U.S. PATENT DOCUMENTS
5,023,900 6/1991 Tayloe et al 455/424
5,095,500 3/1992 Tayloe et al 455/424
5.121,126 6/1992 Clagett 455/456
5.218,367 6/1993 Sheffer et al 342/457
5,465,390 11/1995 Cohen 455/423
5,602,903 2/1997 LeBlanc et al 455/456
A system for measuring electric field strength of radio waves transmitted from cell station and arriving at an arbitrary measuring location is provided that includes a tuner unit, cell station ID (CS-ID) demodulator unit, signal level (or electric field strength) detector (RSSI detector), memory unit, display unit, and controller (CPU). CS-ID codes included in radio waves from cell stations and transmitted to an arbitrary measuring location are detected by the demodulator unit, and electric field strength (RSSI) data of the received radio waves are detected by the RSSI detector. All sets of the CS-ID and RSSI data are stored at addresses in the memory unit corresponding to each of the measuring locations, and the stored sets of the CS-ID data and RSSI data are read from the memory unit and displayed on the display unit in association with information indicative of the measuring location.
18 Claims, 7 Drawing Sheets
