| 摘要 |
PURPOSE:To shape the distortion of waveform a reception signal caused by arranging the open loop face of inductive radio line and loop face of loop antenna of moving body at right angles, by executing the logarithm amplyfying processing of detection signal. CONSTITUTION:A loop antenna 4 of moving body is electromagnetically combined with an inductive radio line 1 formed by plural pair wires 21, 22... on which an open loops 3... are provided at every definite interval. Position of the moving body is detected by an amplifier 5 connecting with the line 1 and signal processing circuit 6 by using said antenna 4. On this occasion, when a logarithm amplifier 5' is used instead of the amplifier 5, distortion of detected waveform is shaped by the amplifier 5' even if the loop face of the antenna 4 is arranged in the right angle direction against the loop faces of the loops 3... and is drawn near sine waveform and then, accurate position can be detected. |
