## Fundamental Technologies## Voyager LECP Pages |

Pointing Vector Data Block Format

Word | Description | Units | Type |
---|---|---|---|

1 | SCE GMT Year of Pointing Vector Data Block | years, AD | I |

2 | SCE GMT Day of Pointing Vector Data Block | day of year | I |

3 | SCE GMT Hour of Pointing Vector Data Block | hour of day | I |

4 | SCE GMT Minute of Pointing Vector Data Block | minute of hour | I |

5 | SCE GMT Second of Pointing Vector Data Block | second of minute |
I |

6 | SCE GMT Millisecond (msec) of Pointing Vector Data Block |
msec of second |
I |

7 | FDSC MOD16 Count Value of Pointing Vector Data Block | binary counts | I |

8 | FDSC MOD60 Count Value of Pointing Vector Data Block | binary counts | I |

9 | Pitch Limit Cycle Angle (Rotation about the S/C X-Axis with the positive direction determined by the right hand rule) | deg | E |

10 | Yaw Limit Cycle Angle (Rotation about the S/C Y-Axis with the positive direction determined by the right hand rule) | deg | E |

11 | Roll Limit Cycle Angle (Rotation about the S/C Z-Axis with the positive direction determined by the right hand rule) | deg | E |

12-14 | Cartesian Unit Vector of the S/C X-Axis, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

15-17 | Cartesian Unit Vector of the S/C Y-Axis, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

18-20 | Cartesian Unit Vector of the S/C Z-Axis, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

21-22 | Celestial Clock and Cone Angles of CRS LET C Boresight | deg | E |

23-25 | Cartesian Unit Vector of the CRS LET C Boresight, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

26-27 | Celestial Clock and Cone Angles of CRS LET A Boresight | deg | E |

28-30 | Cartesian Unit Vector of the CRS LET A Boresight, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

31-32 | Celestial Clock and Cone Angles of CRS LET D Boresight | deg | E |

33-35 | Cartesian Unit Vector of the CRS LET D Boresight, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

36-37 | Celestial Clock and Cone Angles of CRS LET B Boresight | deg | E |

38-40 | Cartesian Unit Vector of the CRS LET B Boresight, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

41-42 | Celestial Clock and Cone Angles of CRS TET Boresight | deg | E |

43-45 | Cartesian Unit Vector of the CRS TET Boresight, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

46-47 | Celestial Clock and Cone Angles of CRS HET 1 Boresight | deg | E |

48-50 | Cartesian Unit Vector of the CRS HET 1 Boresight, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

51-52 | Celestial Clock and Cone Angles of CRS HET 21* Boresight | deg | E |

53-55 | Cartesian Unit Vector of the CRS HET 21 Boresight, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

56-57 | Celestial Clock and Cone Angles of CRS HET 22* Boresight | deg | E |

58-60 | Cartesian Unit Vector of the CRS HET 22 Boresight, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

61-62 | Celestial Clock and Cone Angles of the LECP Axis of Rotation | deg | E |

63-65 | Cartesian Unit Vector of the LECP Axis of Rotation, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

66-67 | Celestial Clock and Cone Angles of the PLS Axis of Symmetry | deg | E |

68-70 | Cartesian Unit Vector of the PLS Axis of Symmetry, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

71-72 | Celestial Clock and Cone Angles of the PLS Lateral Detector Boresight | deg | E |

73-75 | Cartesian Unit Vector of the PLS Lateral Detector Boresight, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

76-77 | Celestial Clock and Cone Angles of the HGA Boresight | deg | E |

78-80 | Cartesian Unit Vector of the HGA Boresight, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

81-82 | Celestial Clock and Cone Angles of the PPS Optic Axis | deg | E |

83-85 | Cartesian Unit Vector of the PPS Optic Axis, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

86-87 | Celestial Clock and Cone Angles of the UVS Airglow Optic Axis | deg | E |

88-90 | Cartesian Unit Vector of the UVS Airglow Optic Axis, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

91-92 | Celestial Clock and Cone Angles of the UVS Occultation Optic Axis | deg | E |

93-95 | Cartesian Unit Vector of the UVS Occultation Optic Axis, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

96-97 | Celestial Clock and Cone Angles of the IRIS Optic Axis | deg | E |

98-100 | Cartesian Unit Vector of the IRIS Optic Axis, S/C Centered, Earth Mean Ecliptic and Equinox of 1950.0 | dim | E |

101 | Continuation Bit: =1, another pointing vector block follows; =0, last pointing vector block in this logical record | dim | I |

102 | Azimuth | deg | E |

103 | Elevation | deg | E |

104 | Twist | deg | E |

105-126 | Spares |

** HET 2, Positions 1 and 2, i.e., HET 21 and HET 22*

- Table G-1. Nominal S/C Clock and Cone Angles of the Fixed Instrument Boresights
- Right Ascension and Declination Algorithm

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Contents.

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Last modified 12/6/02, Tizby Hunt-Ward

tizby@ftecs.com