Patent ID: 11906646
Assignee: SOUTHEAST UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G  Y | IPC G

Claim 3:
4. The method for estimating the air propagation delay of the direct wave according to claim 3, wherein a hypothetical point on the ray where the arrival angle of the direct wave is located is selected as the transmitting end in step 3; let the hypothetical point be point P; the distance from the hypothetical point to the receiving end is rP, the receiving end is the origin of coordinates, and the coordinate of the hypothetical point is expressed as:

rP=rP[sin θr,0 cos φr,0 sin θr,0 sin φr,0 cos θr,0], Where, rP means the coordinate of the hypothetical point, φr,0 means the azimuth of departure of the direct wave, and θr,0 means the elevation angle of arrival of the direct wave.