Flexible configuration for the Lyman FUSE fine-error sensor

Robert Lowles; John P. Hackett

doi:10.1117/12.211465

8 June 1995 Flexible configuration for the Lyman FUSE fine-error sensor

Robert Lowles, John P. Hackett

Proceedings Volume 2479, Telescope Control Systems; (1995) https://doi.org/10.1117/12.211465
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

Abstract

The fine error sensor (FES) system is a star tracker like device that is used within the Lyman far ultraviolet spectroscopic explorer (FUSE) instrument. The FES extends the performance achievable from the conventional star trackers by providing very low noise guidance reference signals. In addition the FES is used for scene and target identification for the UV system operation. This is accomplished by the FES looking through the Lyman FUSE telescope system by means of a pick-off mirror at an intermediate image. This paper describes the proposed readout electronics for the FES CCD and the CCD clock driving system. The clock driving system is unique in that software can reconfigure the hardware required to generate the various CCD clocks and the timing signals for the readout electronics. An adaptable method used to define the location of the six sub-rasters, used to identify the selected guide stars, is described. A variable clocking rate is utilized to minimize readout time while minimizing read noise. The benefits of using RAM based field programmable gate array (FPGA) technology for flight programs also is highlighted.

Citation Download Citation

Robert Lowles and John P. Hackett "Flexible configuration for the Lyman FUSE fine-error sensor", Proc. SPIE 2479, Telescope Control Systems, (8 June 1995); https://doi.org/10.1117/12.211465

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KEYWORDS

Charge-coupled devices

Clocks

Field programmable gate arrays

Stars

Electronics

Field effect transistors

Logic

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