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High-precision multi-path aerial survey camera exposure time synchronization device and method based on FPGA

An exposure time and aerial survey camera technology is applied in the field of exposure time synchronization devices for high-precision multi-channel aerial survey cameras to achieve the effects of improving time accuracy, reducing difficulty and reducing errors

Pending Publication Date: 2020-02-28
CHENGDU JOUAV AUTOMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unable to process in parallel means that the collected GPS time does not match the actual exposure feedback time

Method used

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  • High-precision multi-path aerial survey camera exposure time synchronization device and method based on FPGA
  • High-precision multi-path aerial survey camera exposure time synchronization device and method based on FPGA

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0046] Such as figure 1 , figure 2 As shown, the present invention is based on the FPGA-based high-precision multi-channel aerial survey camera exposure time synchronization device, including a processor chip, a multi-channel camera, an FPGA chip, a GPS unit, an IMU unit and a power supply, and a memory is arranged in the FPGA chip; Connect multi-channel cameras, the processor chip is connected to the flight control device in two directions; the multi-channel camera is connected to the FPGA chip in one direction, and the FPGA chip is connected to the IMU unit and processor chip in two directions; the GPS unit is connected to the processor chip in one direction, and the GPS unit is connected to the FPGA in one direction The chip; the power supply is connected to the multi-channel camera, and is used to supply power to each camera in the multi-channel camera;

[0047] The processor chip is used to receive the camera command of the flight control device, drive the multi-channel...

Embodiment 2

[0065] Such as figure 1 , figure 2 As shown, the difference between this embodiment and Embodiment 1 is that the FPGA-based high-precision multi-channel aerial camera exposure time synchronization method includes:

[0066] Step 1: The processor chip receives the camera command from the flight control device, and at the same time, the processor chip feeds back the working status of each module and the missing chip information to the flight control device through the CAN bus;

[0067] Step 2: The processor chip is connected to the camera and the manual switch through the OC gate, and drives the multi-channel cameras connected to it to shoot;

[0068] Step 3: After the multi-camera shooting is completed, the exposure signal EVENT is fed back to the FPGA chip and the processor chip at the same time. When the exposure signal EVENT is received, the FPGA chip analyzes the measurement information of the IMU unit and the second pulse PPS of the GPS unit, and the processor chip receiv...

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Abstract

The invention discloses a high-precision multi-path aerial survey camera exposure time synchronization device and method based on an FPGA, and solves the problems that most of the existing synchronousexposure control devices are insufficient in clock precision, and the camera exposure feedback is difficult to process in parallel. The device comprises a processor chip, multiple cameras, an FPGA chip, a GPS unit, an IMU unit, a power supply and a memory. The processor chip is bidirectionally connected with the multiple cameras and a flight control device, the multiple cameras are in one-way connection with the FPGA chip, and the FPGA chip is in two-way connection with the IMU unit and the processor chip; the GPS unit is in one-way connection with the processor chip, and the GPS unit is in one-way connection with the FPGA chip. The device and the method are suitable for the multi-camera synchronous shooting of an unmanned aerial vehicle, improve the time precision of the multi-camera synchronous shooting of the unmanned aerial vehicle, accurately recognize the position of a missing film, and facilitate the supplementary shooting of the missing film. The FGPA chip shares the work of parallel processing, and errors are reduced.

Description

technical field [0001] The invention relates to the technical field of multi-camera synchronous shooting of unmanned aerial vehicles, in particular to an FPGA-based high-precision multi-channel aerial survey camera exposure time synchronization device and method. Background technique [0002] Aerial cameras are one of the core components of unmanned aerial vehicles for industrial surveying and mapping. In recent years, in the fields of agriculture, forestry, and urban construction, the requirements for the accuracy, resolution, and coverage of surveying and mapping images have become higher and higher. The current remote sensing method using unmanned aerial vehicles is limited by the flight height, and often cannot meet the requirements for the efficiency of global photography. This increases the efficiency and quality of mapping wide areas. [0003] For multi-camera shooting, there are two important evaluation criteria: the synchronization of shooting and the accuracy of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235H04N5/073
CPCH04N5/0733H04N23/73
Inventor 曹健铭杨建张伟
Owner CHENGDU JOUAV AUTOMATION TECH
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