(GLAS) PRECISION ATTITUDE DETERMINATION - Center for ...

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(a) for existing star(b) for new starεε+BD∆α 1∆α 1∆α 247k∆α 2RA(α)α 0+εα 0α 0-εincreasingk(catalog number)decreasing∆α 1 ≥ 4˚∆α 2 ≥ 8˚Figure 4.8: Search formatched star in star catalog
Declination(a)α 0-∆αα 0+∆αRight Ascension (α)zone 1Declinationzone 2zone 3(b)zone 4α 0-∆αα 0+∆αRight Ascension (α)Figure 4.9: Searching area for star identication. Latitude zones more than 4 are expected.4.2.3 Simulation ResultsIn the simulation of the DMT, we achieved almost 100% successful star identicationswithout any misidentication. Table 4.2 shows the results obtained by theDMTwhenthesame simulation data as for the PMA were used.Table 4.2: Star identication simulation results using the direct match technique. Oneorbital period of simulated data were processed.RA Total Number of Number of Number of() Observed Stars Identied Stars Misidentied Stars0 265738 265735 (99.999%) 045 265003 265003 (100.00%) 090 276872 276867 (99.998%) 0135 275330 275232 (99.964%) 048
Page 3: GLOSSARYATBDBDCCDCRFCRSDMTEKFFOAMFO
Page 11: Chapter 2FUNDAMENTALS OFATTITUDE DE
Page 14 and 15: Rigorous satisfaction of a set of l
Page 16 and 17: lead to the attitude dierential equ
Page 18 and 19: To take advantage of multiple unit
Page 20 and 21: ppstarz SCF(boresightdirection)66op
Page 22 and 23: Table 3.1: Characteristics of the c
Page 25 and 26: Start?ReadStar Catalog?Input Initia
Page 27 and 28: Table 3.3: Some noise characteristi
Page 29 and 30: 3.2.1 Gyro ModelFarrenkopf's gyro m
Page 31 and 32: Table 3.4: Probability of the numbe
Page 33 and 34: the Sun, ~v, by [52], = j~vjcsin (
Page 35 and 36: 4.1 Pattern Matching Algorithm4.1.1
Page 37 and 38: 0 17(9)5(7)1(11)180 . . .-CC CW25(
Page 39 and 40: . If these conditions are satised,
Page 41 and 42: ....* 30 *400base lineAAAAAAAAAAU*
Page 43 and 44: third star is considered in a posit
Page 45 and 46: Star Tracker FOVat t i+1at t i+1obs
Page 47: the unique identication. If no star
Page 51 and 52: The B-matrix is very important sinc
Page 53 and 54: The square roots of the diagonal co
Page 55 and 56: The benet of the FOAM over the SVD
Page 57 and 58: subject to(t k;1 t k;1 ) = I 33 (5.
Page 59 and 60: where ~v k is a discrete white Gaus
Page 61 and 62: Figure 5.1: QUEST angle errors in a
Page 63 and 64: Table 5.2: SFAD computation time ob
Page 65 and 66: Figure 5.5: Angle errors from batch
Page 67 and 68: Figure 5.8: True errors versus rms
Page 69 and 70: Star Field6LRCLaser Reference Camer
Page 71 and 72: Star TrackerAAAAAAAA Astar A Ab AAA
Page 73 and 74: Figure 6.5: Pointing determination
Page 75 and 76: LRSLPAFigure 6.7: Projection of LPA
Page 77 and 78: A(t), needs to be known at a 40 Hz
Page 79 and 80: starspacecraftV = V earth+ V s/cV =
Page 81 and 82: simulation can be applied for the e
Page 83 and 84: Chapter 7IMPLEMENTATIONCONSIDERATIO
Page 85 and 86: with the real time determination. T
Page 87 and 88: Bibliography[1] European Space Agen
Page 89 and 90: [31] B.E. Schutz. Spaceborne Laser
Page 91 and 92: ACKNOWLEDGMENTSThe authors would li
Page 93 and 94: where C ij is a matrix componentini

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