| 摘要 |
<p>PURPOSE:To keep erroneous alarm probability constant over an entire distance range, by using the value of a min. distance for bringing reference output to normality and correcting the delay time required in processing. CONSTITUTION:The signal VR sent to a first delay circuit 2 is sent to a multiplier 7 from a subtractor 3 through an accumulator 6 and sent to a first comparator 5 and a buffer register 8 as output VRE1. The signal VR sent to a second delay circuit 4 is delayed by half therein on the basis of the number of delays of the circuit 2 and sent to a comparator 5 and a third delay circuit 9 as output VTS1. The outputs VTS1, VRE1 are compared in amplitude and, when VTS1 is large, the signal is detected and, when small, no detection is performed. Output VOT1 is sent to a delay circuit 10 to be delayed to the same degree as the circuit 4 and sent to a selector 11 as a judge signal VOT2. Further, the signal VRE1 is sent to a second comparator 12 as the signal VRE2 by a signal TB. In addition, the output VTS1 is delayed by the same degree as the circuit 4 and sent to the comparator 12 as VTS2 and compared with the output VRE2 to be sent to the selector 11 as VOT3.</p> |
