US 11,899,149 B1
Method for automatically identifying active source azimuth of planetary seismometer
Juan Wang, Beijing (CN); Qingyu You, Beijing (CN); Shengquan Zhang, Beijing (CN); Shaoqing Li, Beijing (CN); and Jinhai Zhang, Beijing (CN)
Assigned to INSTITUTE OF GEOLOGY AND GEOPHYSICS, THE CHINESE ACADEMY OF SCIENCES, Beijing (CN)
Filed by INSTITUTE OF GEOLOGY AND GEOPHYSICS, THE CHINESE ACADEMY OF SCIENCES, Beijing (CN)
Filed on Aug. 10, 2023, as Appl. No. 18/447,322.
Claims priority of application No. 202310458339.5 (CN), filed on Apr. 26, 2023.
Int. Cl. G01V 1/30 (2006.01); G01V 13/00 (2006.01)
CPC G01V 1/307 (2013.01) [G01V 13/00 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method for automatically identifying an active source azimuth of a planet seismometer comprising:
receiving, by the planet seismometer, vibration signals of N support legs of a lander, wherein the vibration signal of each support leg comprises an active source first arrival signal; and intercepting a three-channel original time sequence in a duration δt before and a duration δt after the active source first arrival signal of every one from the first support leg in the N support legs to the N-th support leg in the N support legs received by the planet seismometer in turn;
converting the three-channel original time sequence to a horizontal plane based on a pitch angle θ1 and a roll angle θ2 of the planet seismometer after being deployed to a surface of a planet;
converting a time sequence of the horizontal plane to RTZ coordinates and calculating the maximum amplitudes of components of a vibration signal in the R direction and in the T direction;
constructing a target function A based on the maximum amplitudes of components of a vibration signal in the R direction and in the T direction, scanning an azimuth φ of the planet seismometer at preset angle intervals in a range of 0˜360°, and identifying an azimuth φ of the planet seismometer corresponding to the minimum of the target function A as the optimal estimation for azimuth.