| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a function for detecting a target at a position near a position where an aircraft is the closest to a target by expressing the noise portion of a target magnetism-searching signal with an AR(auto-regressive) model that is shown by a specific expression and detecting the target according to the amount of prediction error between a prediction value and the value of the target magnetism-searching signal or statistical characteristics. SOLUTION: A noise portion Noise (k) of a target magnetism-searching signal X(i) is expressed as shown in an expression by an AR model calculator 10. AR parameters (N, an (n=1, 2,..., N)) are stored in a memory 11. A prediction value for the current time is calculated from the AR parameters being stored in the memory 11 and the target magnetism-searching signal between specific time by a prediction value calculator 12, and further a prediction error is calculated by a prediction error calculator 13. The prediction error is converted to an absolute value by an absolute value converter 14 and a threshold is verified by signal verification equipment 15, thus detecting a target.</p> |
