Automatic identification method and device for planetary seismograph azimuth angles based on planetary sundial

An automatic identification method for planetary seismograph azimuth angles based on a planetary sundial, comprising:

• obtaining a geographical coordinate of a sundial needle tip relative to a planetary surface by a ground station computer;
• obtaining an overlooking image of a sundial needle shadow by a rover camera or a lander camera, and obtaining a first solar ray elevation angle and a first solar ray azimuth angle by the ground station computer;
• obtaining a geographical coordinate of a sundial needle tip shadow relative to the planetary surface according to the overlooking image by the ground station computer;
• determining a theoretical second solar ray elevation angle and a second solar ray azimuth angle according to the geographical coordinate of the sundial needle tip relative to the planetary surface and the geographical coordinate of the sundial needle tip shadow relative to the planetary surface;
• constructing an objective function based on the first solar ray elevation angle and the first solar ray azimuth angle, and the second solar ray elevation angle and the second solar ray azimuth angle;
• the objective function defined as:
• A
• =
• ❘
• "\[LeftBracketingBar]"
• α
• -
• α
• ′
• ❘
• "\[RightBracketingBar]"
• +
• ❘
• "\[LeftBracketingBar]"
• β
• -
• β
• ′
• ❘
• "\[RightBracketingBar]"
• wherein, α and β are the first solar ray azimuth angle and the first solar ray elevation angle;
• and α′ and β′ are the second solar ray azimuth angle and the second solar ray elevation angle;
• solving the objective function by taking a minimum objective function as a target to obtain a planetary seismograph azimuth angle configured for a layout of a planetary seismograph to explore an internal planetary structure and planetary underground resources.