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1 Artificial Satellites : Journal of Planetary Geodesy

1 2008

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Fast response, medium resolution digital Event Timer and Range Gate Generator for Satellite Laser Ranging

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Iqbal F. , Kirchner G. , Koidl F.

Artificial Satellites : Journal of Planetary Geodesy

2008

tom Vol. 43, No. 4

143--149

For our kHz Satellite Laser Ranging (SLR) system in Graz, we developed a fast response, medium resolution Event Timer to determine laser firing times; and a digital Range Gate Generator to activate the Single Photon Avalanche Detector (C-SPAD). The Event Timer has a resolution of about 500 ps, and determines the Event Times within 20 ns; the Range Gate Generator produces a range gate pulse with about 500 ps resolution, and with an accuracy of better than 1 ns. Both devices are fully digital, and are implemented within an FPGA circuit. These devices can be used in the present 2 kHz SLR system, as well as in future higher repetition rate SLR systems.