| 摘要 |
PROBLEM TO BE SOLVED: To provide a service area discrimination system which improves exactness at a fixed station. SOLUTION: A field intensity measuring means 4 measures the received field intensity of the radio signal, the measured field intensity value is recorded in a field intensity recording means 5, and a field intensity operation processing and storage means operationally processes the field intensity value and preserves the result. A predetermined numerical value is recorded in a level storage means 7, a level comparing means 8 compares the operated value recorded in the field intensity operation processing and storage means 6 with the numerical value recorded in the level storage means 8, and a signal output means 9 outputs the compared result of the level comparing means 8. Thus, exactness is remarkably improved rather than judgement based on one field intensity value and there is an effect that the high reliability of the system is secured. |
