StarNav Advanced CMOS Star Trackers: enhanced accuracy, reliability and speed John L. Junkins Texas A&M University May 16, 2002.

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Presentation transcript:

StarNav Advanced CMOS Star Trackers: enhanced accuracy, reliability and speed John L. Junkins Texas A&M University May 16, 2002

StarNav I, II, and III Advanced Star Tracker Systems The StarNav sensors combine novel hardware and software to establish a new generation of smart navigation sensors Outputs 5 m rad 3 axis accuracy Split field of views optics means one camera sees two orthogonal starfields simultaneously => cost reductions, accuracy improvements CMOS Active Pixel Sensor => rad. tolerance and high frame rates Fast/reliable star identification algorithm for lost in space (LIS) case, first algorithm capable of reliable LIS star ID for magnitude six stars in a small fraction of a second. Recursive on-orbit autonomous self-calibration => greatly enhanced reliability, autonomy and accuracy, esp. for long missions. StarNav I: Proof of Concept Experiment for STS 107 (July ’02) StarNav II: 10 HZ GIFTS Mission StarTracker (Circa 2003) StarNav III: 60HZ Gyroless Attitude and Rate Sensor (SLI) May 16, 2002 GIFTS Software TIM, College Station, TX Slide No. 2

Advanced Technology for Autonomous Space Navigation May 16, 2002 GIFTS Software TIM, College Station, TX Slide No. 3

STARNAV: Recent Legacy Research and development at TAMU from laboratory brassboard to flight prototype A Micro-Star Tracker for Micro-Spacecraft A self-calibrating Smart Sensor, outputs attitude, not image data Striving for Significant Advances: Low Cost Light Weight Low Power High Accuracy STARNAV I: Lab Test Configuration MICRO STAR TRACKER CAMERA HEAD FRAME GRABBER SITe SIA502AB 512 x 512 CCD array peak quantum efficiency 0.85 LENS SINGLE BOARD COMPUTER 586-133, 32 Mb DRAM, 40 Mb FLASH 1999 STS 107 StarNav I Flight Experiment 2002 STARNAV I – On-orbit demonstration of advanced “Lost in Space” algorithms and data collection for recursive on-orbit calibration implementation. May 16, 2002 GIFTS Software TIM, College Station, TX Slide No. 4

StarNavII Split Field of View Star Camera for the EO-3 GIFTS Mission The StarNav II camera simultaneously images star fields from two parts of the sky, real-time identification of the star patterns, and determination of 3 axis attitude with a precision of 5 mrad (1s). StarNavII Split Field of View Star Camera for the EO-3 GIFTS Mission May 16, 2002 GIFTS Software TIM, College Station, TX Slide No. 5

STARNAV II (TCP’s EO-3 Prototype) Dual Field of View Tech Demo Success! FOV 1 FOV 2 Patents applied for. Dual Field-of-View Star Tracker Concept Two star field images are superimposed onto a single image plane. This concept eliminates the unavoidably poor sensitivity of a single star tracker in resolving rotations about the optical axis without incurring the mass penalty of a second star tracker. The star images of each field-of-view are “tagged” optically via cylindrical meniscus lenses, resulting in elliptical star images. Spots are then sorted by shape to determine the FOV of origin. Tom Pollock’s night sky expmt, Oct, 2000 May 16, 2002 GIFTS Software TIM, College Station, TX Slide No. 6

STARNAV Dual FOV Testbed Dual Field-of-View Star Tracker Engineering Model for Concept Verification Status: assembled bench tested night sky tested May 16, 2002 GIFTS Software TIM, College Station, TX Slide No. 7