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Method for synchronously testing camera frame signals with high precision and circuit system thereof

A high-precision synchronization and frame signal technology, which is applied to the parts of the TV system, TV, electrical components, etc., can solve the problems of camera frame signal and GPS synchronization system time drift, not being able to last a long time, etc., to achieve accurate measurement of the target position, The effect of stable and reliable work and stable output interval

Inactive Publication Date: 2019-07-26
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The present invention proposes a high-precision synchronous camera frame signal testing method and its circuit system, aiming at solving the problem that the existing oscilloscope and acquisition card system cannot measure the camera frame signal time delay, high-precision synchronously for a long time, frame loss and the difference between the camera frame signal and Time Drift Problem of GPS Synchronization System

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  • Method for synchronously testing camera frame signals with high precision and circuit system thereof

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Embodiment Construction

[0039] This embodiment mainly utilizes the high-precision second signal produced by the global synchronous GPS / BD / B code time system terminal, combined with a high-precision microsecond signal (accuracy is 0.1 μm) produced by a circuit module based on FPGA, the test high Precision aerospace camera frame signal rising edge time and / or falling edge time, or test frame rising edge time and / or falling edge time of high-definition HDI / SDI interface camera, for asynchronous frame signal tracking.

[0040] The specific selection of each module is as follows:

[0041] (1) LVDS interface camera: mainly for aerospace or industrial cameras with LVDS interface output.

[0042] (2) HDI-SDI interface high-definition camera: mainly for industrial HDI-SDI interface output cameras, used for image storage and asynchronous tracking.

[0043] (3) OCXO constant temperature crystal oscillator. Crystal oscillator frequency: 10MHz; company: IQD is Roslin's own brand, output level: HCMOS, frequency ...

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Abstract

The invention provides a method for synchronously testing camera frame signals with high precision and a circuit system thereof, and aims to solve the problems that the existing oscilloscope and acquisition card system cannot synchronously measure the camera frame signal delay and frame loss for a long time with high precision and the time drift exists between the camera frame signal and a GPS (Global Positioning System). The method and the circuit system thereof support an LVDS interface camera and / or an HDI-SDI interface camera; the crystal oscillator period is taken as a counting period, periodic zero clearing is performed according to the second pulse signal generated by the time unification terminal, and counting is started; when the rising edge or the falling edge of the TTL signal arrives, the counting value at the moment is obtained and locked to obtain the counting time which is accurate to the 0.1 m magnitude in the current pulse per second; meanwhile, a serial time code generated by the timing system terminal is obtained and locked, and conversion is perforemd to obtain second signal time in units of second; and the second signal time is superposed tothe time frame signal with the 0.1 m-magnitude counting time to obtain the synchronization time of the time frame signal.

Description

technical field [0001] The invention relates to a method for testing camera frame signals and a circuit system thereof. Background technique [0002] In the aerospace field, it is necessary to test the high-precision synchronization of the frame signal of the aerospace LVDS interface camera for a long time, so that when the camera exposure time changes, the frame signal output by the camera has a high-precision synchronization time, and the camera output can be judged by the high-precision time point Whether the image data is time-synchronized with the ground system; moreover, judge whether there is a frame loss phenomenon in the output image of the camera by continuously recording the time point when the frame signal is generated. [0003] In the field of ground shooting range photoelectric theodolite tracking targets, it is necessary to test the high-precision synchronization time of the frame signal of the HD-SDI interface camera, so that the tracker can transmit the time...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N17/00H04N5/04
CPCH04N5/04H04N17/002
Inventor 张永康陈二瑞田雁许朝晖梁冬生李翔伟张勉知
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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