Optimal conditions for distance determination by the range-intensity correlation methods using range-gated viewing system with nonrectangular pulses

Vitaly Kabashnikov; Boris Kuntsevich

doi:10.1117/12.2532293

16 October 2019 Optimal conditions for distance determination by the range-intensity correlation methods using range-gated viewing system with nonrectangular pulses

Vitaly Kabashnikov, Boris Kuntsevich

Author Affiliations +

Proceedings Volume 11160, Electro-Optical Remote Sensing XIII; 111600O (2019) https://doi.org/10.1117/12.2532293
Event: SPIE Security + Defence, 2019, Strasbourg, France

Abstract

Range-gated viewing systems, which were at first used for object observation under poor visibility conditions, are used now also to determine distances to objects and obtain 3D images. A number of methods were suggested to determine distance. For instruments operating in real time, it is important to use fast methods. Range-intensity correlation methods are such methods because they use only two images. The methods work with rectangular-shaped illumination pulses and rectangular gate pulse shape. However, real pulses may differ from the rectangular ones that may introduce significant error into the distance measurement. To avoid the error one has to use a calibration dependence of the distance on the signal. The calibration curve depends not only on time profiles of the pulse and gate, but also on the gate duration and the difference between delay times of two images. Experimental search for optimal measurement condition through trial and error is a rather cumbersome problem. Therefore, we used numerical simulation and analytical estimates. The pulse time profile could be taken arbitrary. The gate time profile was assumed to be rectangular. The ratio of the energies received by the same pixel in two images depending on distance is used to build calibration curve. With given pulse shape, by varying gate time and delay time difference, we obtain calibration curves with different slope, different position on the distance scale and with different range of the determined distances. It appeared that the greater the slope of the curve, the narrower the range of measured distances and the lower the pixel energy. The conditions were found to get monotonous calibration curve with the highest possible return signal from all points on the distance determination interval.

Citation Download Citation

Vitaly Kabashnikov and Boris Kuntsevich "Optimal conditions for distance determination by the range-intensity correlation methods using range-gated viewing system with nonrectangular pulses", Proc. SPIE 11160, Electro-Optical Remote Sensing XIII, 111600O (16 October 2019); https://doi.org/10.1117/12.2532293

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
10 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Calibration

Distance measurement

Pulsed laser operation

Modulation

Sensors

Visibility

Rectangular pulse

Show All Keywords

Keywords/Phrases

Search In:

Publication Years