| 摘要 |
<p>A storm warning apparatus comprises a set of receiving aerials (10,12,14) which are constructed to pick up the E-field, and orthoganal components of the H-field of electromagnetic energy generated during lightning activity. The apparatus discriminates against spurious signals by means of a threshold and a slope detector (32,30). The direction of the lightning activity is calculated from the incoming E and H field strengths and the range is calculated from the relative attenuation of the H-field between a first and a second frequency. The calculations and sequence of events in computing the position of lightning activity are controlled by a microprocessor (52).</p> |
