3D Time-of-flight distance measurement with custom - Universität ...
3D Time-of-flight distance measurement with custom - Universität ...
3D Time-of-flight distance measurement with custom - Universität ...
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180 CHAPTER 6<br />
6.4 Discussion<br />
With flexible implementations <strong>of</strong> a sequencer board and driving electronics suited<br />
for CMOS/CCD circuitry we have built two TOF range cameras. These are the<br />
world’s first all-solid-state 2D and <strong>3D</strong> time-<strong>of</strong>-<strong>flight</strong> cameras that are based on<br />
<strong>custom</strong>ized photoASICs. The arrangement <strong>of</strong> the 1-tap pixels in a line results in an<br />
RC string that limits the modulation frequency for the modulated photogates. The<br />
cut-<strong>of</strong>f frequency can be increased by connecting the polysilicon strips from at least<br />
two sides. It is thus possible to operate the range cameras at a modulation<br />
frequency <strong>of</strong> 20 MHz, resulting in an unambiguous <strong>distance</strong> range <strong>of</strong> 7.5 meters.<br />
Over the full <strong>distance</strong> range we can measure non-cooperative targets <strong>with</strong> an<br />
accuracy <strong>of</strong> better than 10 centimeters. With the range <strong>measurement</strong>s performed<br />
we could affirm the ranging accuracy predicted in our estimations in Chapter 4.2.
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