StarId

class sonic.StarId
Method Summary
static checkTriad(kvec, cat_idx, pointsS2_meas, pointsS2_cat, ijk, tol, max_angle, min_matches)

[matches, att_ICRF2C] = check_triad(kvec, cat_idx, pointsS2_meas, pointsS2_cat, ijk, tol, max_angle, min_matches)

Check if a triad is a valid triad, given a k-vector table.

Inputs:

  • kvec (1x1sonic.Kvector): a k-vector table

  • hip_cat_idx (:x1 uint64): indices of the catalog

  • points2_meas (sonic.Points2): unit-normalized vectors measured in the camera frame

  • pointsS2_cat (sonic.PointsS2): catalog line of sights

  • ijk (3x1 uint64): the indexes of the measurement triad we are checking

  • tol (1x1 double): angular tolerance

  • max_angle (1x1, double): the maximum angle between stars. Usually constrained by the camera FOV.

  • min_matches (1x1 uint64): minimum matches to stop and return

Outputs:

  • matches (2x: int): pairs of measurement and id. In the i-th pair, element matches(1,i) is the number of the measurement and matches(2,i) is the corresponding catalog id

  • att_ICRF2C (sonic.Attitude): attitude of the camera

  • valid (1x1 boolean): whether sufficient matches were

found

Last revised: 04/15/24 Last author: Sebastien Henry

static interstarAngle(kvec, cat, pointsS2_meas, tol, max_angle, min_matches)

Takes in multiple line of sight measurements, in the camera frame, and matches them to stars in the given star catalog. Also returns an attitude estimate from ICRF to camera.

Inputs:

  • kvec (sonic.Kvector): a k-vector object

  • hip_cat (sonic.StarCatalog): star catalog NOTE: it MUST be an unfiltered catalog

  • points2_meas (sonic.Points2): unit-normalized vectors measured in the camera frame

  • tol (1x1 double): angular tolerance, a match is detected if the angle between measurement and catalog is less than tolerance

  • max_angle (1x1, double): the maximum angle between stars. Usually constrained by the camera FOV.

  • min_matches (1x1, uint64): the minimum number of pairs in matches to deem the solution correct. Minimum is 4. Default is 5.

Outputs:

  • matches (2xn int): pairs of measurement-hipparcos index. In the i-th pair, element matches(1,i) is the number of the measurement and matches(2,i) is the corresponding index in the hipparcos catalog (!!! not the id!!!)

  • att_ICRF2C (sonic.Attitude): attitude of the camera

Last revised: 05/01/24 Last author: Sebastien Henry