Square root cubature information filter

Bharani Chandra, Da-Wei Gu, Ian Postlethwaite

    Research output: Contribution to journalArticlepeer-review

    120 Citations (Scopus)


    Nonlinear state estimation plays a major role in many real-life applications. Recently, some sigma-point filters, such as the unscented Kalman filter, the particle filter, or the cubature Kalman filter have been proposed as promising substitutes for the conventional extended Kalman filter. For multisensor fusion, the information form of the Kalman filter is preferred over standard covariance filters due to its simpler measurement update stage. This paper presents a new state estimation algorithm called the square root cubature information filter (SRCIF) for nonlinear systems. The cubature information filter is first derived from an extended information filter and a recently developed cubature Kalman filter. For numerical accuracy, its square root version is then developed. Unlike the extended Kalman or extended information filters, the proposed filter does not require the evaluation of Jacobians during state estimation. The proposed approach is further extended for use in multisensor state estimation. The efficacy of the SRCIF is demonstrated by a simulation example of a permanent magnet synchronous motor.
    Original languageEnglish
    Pages (from-to)750-758
    JournalIEEE Sensors Journal
    Issue number2
    Publication statusPublished - 2013


    Dive into the research topics of 'Square root cubature information filter'. Together they form a unique fingerprint.

    Cite this