Sea surface error correction method for measuring submarine topography on basis of airborne laser radar

Abstract

The invention discloses a sea surface error correction method for measuring the submarine topography on the basis of airborne laser radar. The method comprises the steps that three-dimensional sea surface data is generated according to sea return pulses, a space rectangular coordinate system taking a laser radar launching point M as an original point is established, and coordinates of a sea surface incidence point in the space rectangular coordinate system are calculated; a three-dimensional sea surface coordinate system taking the sea surface incidence point as a coordinate original point, an incidence angle alpha obtained when a laser is incident on sea water and a refraction angle beta are calculated, then the submarine depth h can be calculated according to the incidence angle alpha, the refraction angle beta and the incidence distance L' of refracted rays, the submarine depth h is corrected according to the sea surface height delta h to obtain a submarine depth correction value h1, and then submarine topography data can be formed. According to the sea surface error correction method, errors caused by sea heaving can be effectively corrected, the problem that the precision is poor when the submarine topography is measured by traditional airborne laser radar is solved, and precise measuring of the submarine topography is achieved.

Description

technical field [0001] The invention belongs to the technical field of ocean topography detection, and in particular relates to a method for measuring ocean bottom topography by using an airborne laser radar system. Background technique [0002] Airborne lidar is a laser detection and ranging system. It uses the aircraft to carry a laser transmitter to emit laser pulses to the target to be measured, and uses a laser scanner to receive the returned pulses, thereby obtaining the distance, slope, distance, and distance of the target to be measured. Information such as roughness and reflectivity. At present, airborne lidar systems have been widely used in tasks such as seabed topography and landform surveying, channel detection, and underwater target search. [0003] In the process of using airborne lidar system to measure seabed topography, sea surface error correction technology is one of the key technologies to improve measurement accuracy, which is related to the measuremen...

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Problems solved by technology

[0005] The present invention proposes a sea surface error correction method in order to solve the problem of poor accuracy of measurement results existing in the seabed topography measurement technology based on the design of the airborne laser radar system, and also uses the airborne laser radar system to measure the seabed topography , by correcting the error introduced by the incident angle of the sea surface, it effectively overcomes the influence of sea surface fluctuations on the measurement results, and realizes high-precision measurement of seabed topography

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