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Multipath mitigation is a term typically used in Code Division Multiple Access (CDMA) communications and in GNSS navigation to describe the methods that try to compensate for or cancel the effects of the Non Line Of Sight (NLOS) propagation. The multipath effect occurs when a signal is received not only through a Line of Sight (LOS) path, but also through one or several NLOS paths. The multipath, if not addressed or compensated, can significantly reduce the performance of the communication and navigation receivers. Various multipath mitigation methods can be used to estimate and remove the undesired NLOS components.
Method for multipath mitigation of carrier loop based on improved sage-husa adaptive kalman filter
The application discloses a carrier loop multipath suppression method based on improved Sage-Husa adaptive Kalman filtering, which comprises the following steps: signal correlation processing, early, positive and late correlation outputs and I / Q outputs are obtained; performing multipath detection, early and late correlation ratio analysis, phase lock quality evaluation and code phase deviation dynamic analysis are performed; calculating the basic measurement value, obtaining the preliminary code phase error and the carrier phase error; using carrier phase smoothing processing to enhance the measurement value, adjusting the noise covariance according to the multipath severity, performing adaptive Kalman filtering, including state prediction, gain calculation, state update, Sage-Husa adaptive noise covariance update and adaptive factor dynamic adjustment, storing data and preparing for the next cycle. Through the combination of multipath detection and adaptive filtering, the application effectively identifies the multipath interference and dynamically adjusts the system parameters, and significantly improves the phase tracking precision and reliability of the GNSS signal in a complex environment.
Owner:NANJING UNIV OF INFORMATION SCI & TECH