Research On Array Beampattern Control And Signal Processing Algorithm

As an important branch of array signal processing,the beampattern control technique can design the weight vector to improve the detection,estimation,and anti-interference performance of the sensor array.This dissertation focuses on the theory and signal processing algorithm study for array beampattern control,and the theory discussed include:adaptive array theory and optimization theory.The contributions and innovations of this dissertation are summarized as follows:1.A single-point array response control(SPARC)algorithm is presented to address the parameter optimization problem in single direction beampattern control.The designed weight vector is constructed as an iterative form.The analytical solution for normalized magnitude response control is obtained by solving the accurate response control problem,reducing the computational complexity of beampattern synthesis.2.A precise array response control with minimum pattern distortion(PARC-MPD)algorithm is presented to address the pattern distortion issue caused by the update of the weight vector.The magnitude and phase responses are considered to construct the cost function of beampattern distortion.The analytical solution for minimum pattern distortion is theoretically derived to solve the pattern distortion issue.Compared with the existing single direction array response control algorithms,the PARC-MPD needs fewer iteration steps to realize beampattern synthesis.3.A multi-point array response control(MPARC)algorithm is presented to address the strong coupling issue among process variables in multi-direction beampattern control.The minimum pattern distortion(MPD)principle is utilized to obtain the analytical solution for precise array response control in multiple directions,resulting in low computational complexity.The beampattern synthesis scheme based on the MPARC algorithm is presented to address the angle omission problem.4.An accurate phase response control(APRC)algorithm is presented with the consideration of the broadcasting nature of wireless communication.The phase response and normalized magnitude response are jointly controlled to realize directional modulation.The feasibility of arbitrary phase response control is theoretically derived,and the APRC algorithm utilizes the geometric method to obtain the analytical solution of transmit weights.5.A spatial power design based transmit covariance matrix design(TCMD)algorithm is presented to realize multiple-input-multiple-output(MIMO)radar beampattern matching.The transmit waveform covariance matrix is constructed as an iterative form,and the analytical solution for precise beampattern control is obtained by designing the spatial power factor.The TCMD algorithm can drastically reduce the computational complexity of MIMO radar beampattern control.