LPFFILES - LISA Pathfinder Archive Data Summary

Overview

This table provides an index for a time ordered set of files containing the telemetry from the the DRS system on the LISA Pathfinder mission. It gives the time in a variety of spacecraft modes for each file. Note that not all modes were explored during the LISA Pathfinder mission.

The Disturbance Reduction System (DRS) was an experiment package aboard the European Space Agency (ESA) LISA Pathfinder spacecraft. LISA Pathfinder (LPF) launched from Kourou, French Guiana, on December 3, 2015. LPF successfully demonstrated the disturbance-free motion of two test masses at a noise level acceptable for a future gravitational wave (GW) observatory. Designated ST7, DRS is the NASA contribution to LPF with the goal of operating disturbance reduction technology in space applicable to GW missions and other future missions with challenging stability requirements.

DRS flew two clusters of four, low-noise, colloid micro-thrusters (eight total) and a computer which implemented drag-free control laws. At specific times during the LPF mission, DRS operated as alternative to the ESA provided thrusters and control laws. The location of the test masses relative to the spacecraft and the attitude of the spacecraft were measured by ESA subsystems and provided to DRS as its sensors.

The displacement and attitude of the spacecraft relative to the two test masses was controlled using the colloid thrusters and electrostatic forces on the TMs provided by the LPF systems. The key requirements for DRS were to show that the thrust noise was less than 0.1 micro-N, and the spacecraft position noise was less than 10nm/sqrt( Hz) in the measurement frequency band of 1 to 30 micro-Hz. ST7 also recorded the relative acceleration noise (delta-g) between the two test masses, a key metric for the GW application, but had no requirement did not optimize the delta-g performance because this is primarily dependent on the (ESA) inertial sensor. ST7 executed a primary mission in which the thrust noise of the thrusters and the performance of the drag free control were measured and a short extended mission which was used to optimize the performance and expand the operating range of the thrusters and control laws.

References

LISA Pathfinder site: http://sci.esa.int/lisa-pathfinder/

LISA Pathfinder ESA Archive: http://lpf.esac.esa.int/lpfsa/

DRS Reference: https://www.cosmos.esa.int/web/lisa-pathfinder/distrurbance-reduction-system

Provenance

This table was created by the HEASARC in February 2018 based on data files provided by Jacob Slutsky and Leonid Petrov, which were reformatted from the base files at the LISA Pathfinder archive at ESA. The reformatted data files are available at https://heasarc.gsfc.nasa.gov/FTP/lpf/data/fits/ with summaries of the instrument mode intervals available in summary files in https://heasarc.gsfc.nasa.gov/FTP/lpf/data/summ/.

Parameters

File_Stem
The base of the file name.

Time
The start time for the file.

End_Time
The end time for the file.

Ontime
The total time in the SCI_SCIENCE_1Hz data, in seconds.

T_Off
Time in Off mode, in seconds.

T_Init
Time in Init mode, in seconds.

T_STB
Time in STB mode, in seconds.

T_ATT
Time in ATT mode, in seconds.

T_ZG
Time in ZG mode, in seconds.

T_ZGLF
Time in ZGLF mode, in seconds.

T_DFHF
Time in DFHF mode, in seconds.

T_DFLF
Time in DFLF mode, in seconds.

T_DFLLF
Time in DFLLF mode, in seconds.

T_18DOFX
Time in 18DOFX mode, in seconds.

T_18DOF
Time in 18DOF mode, in seconds.

T_CP
Time in CP mode, in seconds.

T_TM2_ZGLF
Time in TM2 ZGLF mode, in seconds.

T_TM2_DFHF
Time in TM2 DHFH mode, in seconds.

T_TM2_DFLF
Time in TM2 DFLF mode, in seconds.

T_TM2_DFLLF
Time in TM2 DFLLF mode, in seconds.

T_TM2_18DOFX
Time in TM2 18DOFX mode, in seconds.

T_TM2_18DOF
Time in TM2 18DOF mode, in seconds.

Contact Person

Questions regarding the LPFFILES database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:30:15 EDT