Exterior orientation element data alignment method for aerial wide-view field scanner
A technology of external azimuth elements and scanners, which is applied in the field of aerial remote sensing imaging, can solve problems such as not being able to meet the clock synchronization requirements of large-field scanners, and achieve the effects of reducing selection requirements, improving compatibility, and reducing resource overhead
Active Publication Date: 2017-02-15
TIANJIN JINHANG INST OF TECH PHYSICS
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[0006] The above content only involves the synchronization of image clock and POS clock, which meets the clock synchronization requirements of aerial cameras where POS directly measures the outer orientation elements of the camera, but cannot meet the clock synchronization requirements of large field of view scanners where outer orientation elements need to be synthesized.
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[0032] In order to make the purpose, content, and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0033] In order to solve the above-mentioned technical problems, the present invention provides a method for aligning outer orientation element data of an aerial large-field scanner. The outer orientation element data of the aerial large-field scanner includes POS data and movement attitude data, wherein the movement Attitude data and motion control clock T scan Time delay Δt 1 Transmission to scanner, POS data and POS clock T p After delay Δt 2 transfer to the scanner;
[0034] The method uses PPS to trigger the scanner's motion control clock, uses post-processing to solve the data transmission delay, and realizes the alignment of POS data and scanner motion attitude data to accurately synthesize the scanner's exte...
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The invention belongs to the technical field of aerial remote sensing imaging and particularly relates to an exterior orientation element data alignment method for an aerial wide-view field scanner. Compared with the prior art, the method of the invention has the beneficial effects that: 1) a PPS counting value is used for resetting a scanner motion control clock, the counting range of the scanner motion control clock counter is controlled in a second level, and thus, the resource overhead of the counter is greatly reduced; 2) the PPS initial count does not need to be initialized to be synchronously reset with the initial count for scanner motion control, selection requirements on a POS are reduced, and the device compatibility is improved; and 3) whether the PPS counting value under control of the scanning motion is lost can be judged through judging whether time delay deltaT is larger than 1s, interpolation is carried out on the counting value, and the fault-tolerant ability is good.
Description
technical field [0001] The invention belongs to the technical field of aerial remote sensing imaging, and in particular relates to a method for aligning outer azimuth element data of an aerial large field of view scanner. Background technique [0002] An aviation wide-field scanner sweeps the ground at a large angle, driving the internal camera to scan and image with a large field of view. Its position and attitude measurement system (POS) is located on the base of the scanner and is not directly sensitive to camera motion. Therefore, it is necessary to align the POS data with the motion attitude data of the scanner, and then synthesize the external orientation element data of the camera inside the scanner, namely There is a synchronization issue between the POS clock and the scanner motion control clock. The allowable clock synchronization error is [0003] [0004] Where dt is the allowable value of clock synchronization error; Δs is the allowable value of positioning...
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IPC IPC(8): G05B19/04G04R20/02
CPCG04R20/02G05B19/04
Inventor 董浩宋秋冬刘迪
Owner TIANJIN JINHANG INST OF TECH PHYSICS