Calculating method of picture taking cycles of panorama type aerial camera

Abstract

The invention provides a calculating method of picture taking cycles of a panorama type aerial camera, and belongs to the technical field of aerial cameras. The calculating method solves the problems that a calculated picture taking cycle can not be realized and picture taking cycle calculation is not accurate due to the fact that the coverage width index requirement is not considered and the scanning angle is too large. An upper boundary value of a half scanning field angle beta is determined according to a target slant angle, and a lower boundary value of the half scanning field angle beta is determined according to the coverage width index requirement. The range R of beta is divided into n discrete values with the same step length, and the largest value thetamaxj of the depression angle and a picture taking cycle Tj in the scanning process are calculated. In the calculating process, a coverage width condition equation is introduced, and the picture taking cycle is made to meet the coverage width requirement; a constraint equation of position holding time thold is introduced, and realizability of the calculated picture taking cycle is guaranteed; in the calculating process, an equal-step-length discrete value sequence is extracted from the continuous range of the half scanning field angle beta, iteration solution of the picture taking cycle is carried out according to the equal-step-length discrete value sequence, and calculation complexity is lowered.

Description

technical field [0001] The invention belongs to the technical field of aerial cameras, and in particular relates to a method for calculating the photographing period of a panoramic aerial camera. Background technique [0002] The panoramic aerial camera rotates the optical components through the servo system to realize the scanning and imaging of the ground scene. Compared with the frame camera and the push-broom camera, it has the advantages of large storage width, flexible setting of the target tilt angle and scanning field of view to adjust the imaging coverage area. In the imaging process, in order to ensure the continuity of the image, a certain course overlap rate requirement must be met between two adjacent scanning images; at the same time, in order to obtain as much image information as possible during the flight mission and improve flight efficiency, a single The images obtained by scanning should meet certain ground coverage width requirements. Based on the abov...

AI Technical Summary

Problems solved by technology

There are some deficiencies in this method: 1. The coverage width index requirement is not considered; 2. Since the actual exposure time in the scanning process is t uni =2β / ω, so when the lateral viewing angle 2β is too large, t uni It will be greater than the T calculated by the above formula, which will cause the calculated photographing period to be unrealizable; 3. The speed value when calculating the speed-to-height ratio should use the average speed in principle, and the current technology mostly uses the instantaneous value provided by the inertial navigation equipment , resulting in an inaccurate calculation of the photographing cycle

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