1. LRO Pointing Allocations
Stephen Andrews
Code 595
August 16-17, 2005

2. Introduction
some data products and instruments drive knowledge, some drive accuracy
instruments on spacecraft bus have different allocations than instruments on instrument module
pointing allocations will be shown for
each of the LRO Instruments
the mini-RF
the High Gain Antenna System
the Solar Array System

3. Notes All values are 3-sigma, zero (or mean) to peak
Allocations derived so that if allocations are met, requirements will be met
Considering rotational errors only; no orbit (translation) errors included
Difference between knowledge and accuracy is ACS control error

4. CRaTER Knowledge Allocation
= 7.42 deg
CRaTER knowledge requirement = 10 degrees two-axis RSS

5. CRaTER Accuracy Allocation
= 7.44 deg
CRaTER accuracy requirement = 35 degrees two-axis RSS

6. Diviner Knowledge Allocation
Diviner spacecraft knowledge requirement = 3000 microrad = 619 asec

7. Diviner Accuracy Allocation
Diviner spacecraft accuracy requirement = 6000 microrad = 1238 asec

8. LAMP Knowledge Allocation
LAMP knowledge desired = 0.2 pixel = 0.06 deg = 216 asec

9. LAMP Accuracy Allocation
LAMP accuracy requirement = 0.15 deg = 540 asec

10. LEND Knowledge Allocation
LEND knowledge requirement = 0.1 deg = 360 asec

11. LEND Accuracy Allocation
LEND accuracy requirement = 0.1 deg = 360 asec

12. LOLA Knowledge Allocation
LOLA knowledge requirement = TBD asec

13. LOLA Accuracy Allocation
LOLA accuracy requirement = 1 deg = 3600 asec

14. LROC NAC Knowledge Allocation
LROC NAC knowledge requirement = TBD asec

15. LROC NAC Accuracy Allocation
LROC NAC accuracy requirement = TBD asec

16. LROC NAC Coalignment Allocation
LROC NAC coalignment accuracy requirement = TBD asec

17. LROC WAC Knowledge Allocation
LROC WAC knowledge requirement = TBD asec

18. LROC WAC Accuracy Allocation
LROC WAC accuracy requirement = TBD asec

19. Mini-RF Knowledge Allocation
Mini-RF knowledge requirement = TBD asec

20. Mini-RF Accuracy Allocation
Mini-RF accuracy requirement = TBD asec

21. HGA Pointing Accuracy Allocation
HGA pointing accuracy requirement = 0.3 deg

22. HGA Pointing Accuracy Notes
Known bias errors assumed measurable/predictable, removable by compensation.
Ground-to-orbit bias errors can be measured and corrected after on-orbit deployment.
Assumes a calibration is done right after ephemeris upload.
Single calibration done to remove thermal distortion bias.
Random/ground to orbit column total is analytical calibration residual error.

23. SA Pointing Accuracy Allocation
SA pointing accuracy requirement = 5 deg

24. SA Pointing Accuracy Notes
Known bias errors assumed measurable/predictable, removable by compensation.
Ground-to-orbit bias errors can be measured and corrected after on-orbit deployment
No calibration needed.

25. Conclusion Pointing allocations understood
Thermal distortions will vary from component to component
Allocations meet component requirements