| 摘要 |
On a sailplane (2) there are disposed two pairs of ultrasonic emitting and receiving transducers, of which the mean axes (P1, P2) form with the axis (X-X) of the sailplane acute angles ( alpha ) which are equal in both directions. The frequency differences are detected between the emission and the echo, these differences being due to the Doppler effect and, without affecting the angles ( alpha ) which remain fixed, deduction takes place therefrom of the angle of drift ( delta ), that is to say the angle between the axis (X-X) and an actual axis of navigation (Y-Y), as well as the velocity along said axis (Y-Y). The two elemental transducers of each pair may be focused, that is to say may have individual axes which converge. Navigation of ships and similar vessels. <IMAGE>
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