Download or read book MIMO Radar for Direction Estimation and Related Topics on Antennas and Microwave Circuits written by Xuanhui Wu and published by . This book was released on 2009 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: This dissertation studies the MIMO radar for direction estimation and several related topics on antennas and microwave circuits. MIMO radar is a recently proposed radar concept that adopts different baseband waveforms to excite different antenna elements. More freedom is provided by the so called waveform diversity, which improves the radar system performance. In this dissertation; a multiband MIMO radar is proposed which is able to exploit frequency diversity and waveform diversity simultaneously, and thus outperforms an existing singleband MIMO radar. The frequency diversity is obtained by applying OFDM technique which provides a solution to adopt wideband waveforms while keeping the waveform orthogonality that is required by a MIMO radar. The antenna's role in a MIMO radar for direction estimation is also investigated through a Cramèr-Rao Lower Bound analysis. This analysis is independent of an estimation algorithm, and gives the best possible estimation performance for a given antenna array. It is shown that the coupling between different antenna elements has great effects on the estimation performance. In addition a multiband MIMO radar is more stable in estimating a target since it averages the coupling effects at different frequencies. Considering the antenna for a radar system, a novel transmission line method is proposed to study the far zone radiation of an antenna under a multilayer structure. This kind of antennas could achieve high directivity if the multilayer structure is carefully designed, and are therefore suitable for long range radar applications. This method is derived based on the Reciprocity Theorem arid the far-field approximation. It transforms a radiation problem into a scattering problem that is mapped into a transmission line circuit thereafter. Also, inspired by the Hertzian dipole model that represents an excitation antenna in the transmission line method, a procedure of getting a wideband Hertzian dipole model is presented. This model can be used to efficiently investigate the radiation characteristics of an antenna mounted on a complex platform. Lastly, a hybrid method is proposed to design substrate integrated waveguide circuits that can be adopted as a low cost implementation of the microwave circuits in a radar.