Multi-target far and near field mixed source positioning method under unknown colored noise

• Main Authors: WEN YANXIN, CHEN JIAN, LIU GUOHONG, YAN XUEZHI, SUN XIAOYING
• Format: Patent
• Language: Chinese; English
• Published: 04.05.2016
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

The invention provides a multi-target far and near field mixed source positioning method under unknown colored noise, and belongs to the field of array signal processing. The method comprises the steps: receiving a target signal through employing a symmetric uniform linear sensor array; determining the types of observation signals of far and near field mixed sources; calculating a covariance matrix of array observation data; extracting far-field and near-field source components; obtaining a corresponding noise subspace, and achieving the estimation of a far-field source azimuth angle; obtaining a near-field source difference matrix; obtaining a corresponding signal subspace; searching an estimated near-field source azimuth angle through a one-dimensional angle; substituting the estimated near-field source azimuth angle into a two-dimensional MUSIC spectrum peak search, and achieving the estimation of a near-field source distance. The method is advantageous in that the method improves the applicability of the