In late 2017, the laser intensity monitor (LIM) current began to decline on the Lunar Reconnaissance Orbiter (LRO) miniature inertial measurement unit (MIMU). The MIMU was powered off in March 2018 and has only been used during extended eclipses, a pre-eclipse orbit phasing maneuver, and critical momentum unloads. Science slews were suspended, and the onboard extended Kalman filter (EKF) was disabled. A coarse rate was estimated through star tracker quaternion differentiation, and attitude was provided directly from a single star tracker. A complementary filter, combining the differentiated quaternions with the integrated acceleration derived from the attitude control torque, was developed, tested, and uploaded to the spacecraft in December 2018. The EKF has been enabled, using the complementary filter rate in place of the MIMU and science slews are now being performed. This paper presents an overview of the complementary filter rate estimation and EKF changes, fault detection updates without the MIMU, and inflight performance improvements.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Performance Improvements for the Lunar Reconnaissance Orbiter Gyroless Extended Kalman Filter


    Beteiligte:
    Halverson, Julie (Autor:in) / Hsu, Oscar (Autor:in) / Calhoun, Philip (Autor:in) / Tedla, Yohannes (Autor:in)

    Kongress:

    2019 AAS/AIAA Astrodynamics Specialist Conference ; 2019 ; Portland, ME, United States


    Erscheinungsdatum :

    11.08.2019


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Performance Improvements for the Lunar Reconnaissance Orbiter Gyroless Extended Kalman Filter (AAS 19-615)

    Halverson-(Thienel), Julie / Hsu, Oscar / Calhoun, Philip et al. | TIBKAT | 2020


    Orbit Determination for the Lunar Reconnaissance Orbiter Using an Extended Kalman Filter

    Slojkowski, Steven / Lowe, Jonathan / Woodburn, James | NTRS | 2015



    Lunar Reconnaissance Orbiter FlatSat

    Wright, Michael | NTRS | 2008


    PRECISION POINTING IMPROVEMENTS FOR THE LUNAR RECONNAISSANCE ORBITER CAMERA

    Halverson, Julie / Calhoun, Phil / Boyd, Aaron et al. | Springer Verlag | 2024