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2 Artificial Satellites : Journal of Planetary Geodesy

2 2008

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

Iqbal F., Kirchner G., Koidl F.

Artificial Satellites : Journal of Planetary Geodesy

2008

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.

A simple and efficient bus system to connect single units within a Satellite Laser Ranging system

Kirchner G., Koidl F., Kucharski D.

Artificial Satellites : Journal of Planetary Geodesy

2008

Vol. 43, No. 3

91--95

Complex systems - like SLR (Satellite Laser Ranging) systems – often need a large amount of cables to connect all remotely controllable add-on units, like flip mirrors, servo-motors, switches etc. on different groups (like mount / telescopes, laser, control PC, observer control station etc.). At the Graz kHz SLR station, more than fifty separate cables connecting these groups have been replaced now with a few single BNC cables, using a simple serial bus system. Each single BNC cable completely connects 2 units (e.g. the PC and the mount); there is no need for synchronization or handshake signals. Data transmission speed ranges from very low - down to a single transmit only on request, or on any change of bits - up to 10 MBits/s. This serial bus is flexible, easy to extent for future upgrades, and fast.