SPICE - Generate DPS Frame CK

[laspsandoval]

Summary

See email from Nick Dutton April 10th 2024:

• SOC gets attitude kernel and reads the CK for valid time intervals using CKCOV – I’m calling each segment a Pointing time interval as it’s ~ a day (I’m using a full day in this example)

• For the “not bad times” during the segment / during the Pointing time interval, sample and store the quaternions at sufficient resolution (probably at least 3 times per rotation)

• Average those quaternions given the approach described in the code and reference document (also attached – I got this from Scott Turner who said they did something similar on Van Allen RBSP) to compute the average Z-axis over that pointing

• Compute the rest of the DPS frame definition X and Y from the Z average, and assign to the DPS CK input data file, 1 entry per pointing with 0 angular velocity. This is a type 2 kernel

• Each entry (or line) will have TDB Start Valid Interval, TDB Stop Valid Interval, 9 Elements of a rotation matrix, 3 trailing zeros to represent the non-rotating frame

• Write out the DPS frame CK given the provided setup file (attached). Obviously feel free to change the PRODUCER_ID to the LASP / SOC or whoever finally codes this up.

• When binning into the DPS frame with a given event time TDB, this CK should automatically switch DPS frame definitions without having to do anything crazy.

Requirements

The more specific the better.

• Implement steps described in the summary

Related tickets

No response