面阵数字波束形成算法研究

【作者】 李军；

【导师】 龚耀寰；

【作者基本信息】 电子科技大学 ， 信号与信息处理， 2003， 硕士

【摘要】 数字波束形成（DBF）技术可显著提高阵列天线的性能，这些性能包括：快速自适应波束置零、超低副瓣、密集多波束、自适应空时处理、高分辨测向和大容量有限带宽通信等等。数字收发组件高额的成本，限制了DBF技术的普遍应用。但随着近几年电子器件技术、微波组件技术和高速数字处理设备技术的发展， DBF技术在相控阵雷达中的应用获得越来越广泛的重视，其应用也不再限于一维或子阵水平。二维面阵收发自适应数字波束形成系统的研究将是今后数字化雷达研究的热点之一。面阵的数字波束形成算法是面阵DBF技术的关键，本文在现有的一维数字波束形成算法基础上，研究了二维面阵的数字波束形成算法，主要工作有：① 面阵的幅度相位全控制自适应数字波束形成算法——对角加载QRD-SMI算法的研究；② 两种面阵唯相位(Phase-Only)数字波束形成算法——小相位扰动约束算法和期望方向增益最大约束算法的研究；③ 面阵的数字多波束形成算法——二维FFT多波束的研究，以及FFT在可编程逻辑器件中的实现。更多还原

【Abstract】 The technology of digital beamforming (DBF) can dramatically increase array antenna performances. These performances include fast adaptive pattern nulling, ultra-low sidelobes, closely spaced multiple beams, adaptive space-time processing, high resolution direction fiding(DF) and increased capacity for band-limited communications systems. The application of DBF is limited by the high cost of digital receiver/transmitter elements. Over the years, as the technology of electronic components, microwave ICs and high speed digital processor continue to improve, DBF ’s practical value for phased array radar is increasing rapidly, and the application of DBF is not limited in one-dimension or subarray level. The research of adaptive digital beamforming (ADBF) system for 2D planar array will be one of the emphases of digital radar.The DBF algorithms are essence of the DBF technology. DBF algorithms for 2D planar array based on the algorithms for 1D array are discussed in this paper. The author’s main contributions include① Research of the adaptive digital beamforming algorithm, which control both amplitude and phase of each array element: diagonal loading QRD-SMI algorithm.② Research of two Phase-Only DBF algorithms: small phase perturbation restriction algorithm and maximum gain of the expected direction restriction algorithm.③ Research of multiple beams algorithm for planar array: 2D-FFT multiple beams. And the realization of FFT with CPLD.更多还原