A new beam broadening synthesis technique for Synthetic Aperture Radar (SAR) antenna array, namely Projection Matrix Algorithm (PMA) is presented. The theory of PMA is introduced firstly, and then the iterative renewed manner is improved to resolve the unbalance problem under amplitude and phase control. In order to validate the algorithm correct and effective, an actual engineering application example is investigated. The beam synthesis results of 1.0∼4.5 times broadening under the phase only control and the amplitude and phase control using improved PMA are given. The results show that the beam directivity, the beam broadening, and the side-lobe level requirements were met. It is demonstrated that the improved PMA was effective and feasible for SAR application.

This paper outlines the actual management situation for domestic and foreign power grid in integrated dispatching and control system,and analyses the contractions and shortages existing in domestic provincial power grid,whose 500 kV substation supervisory control business is developed in early stage of integration.Furthermore,combined with the integration development situation in Shanxi electric power dispatching & control center,a number of innovative solutions are proposed involving management innovation,institution innovation and process innovation.

For broadband synthetic aperture radar applications, a compact broadband horn array antenna is investigated.Ridged waveguide and square horn are used for broadband operating, and the size of the array element is much smaller than the traditional horn. The measured operating frequencies covered all X-band, more than 40% at centered frequency about 10 GHz. A 4 x 8 array was tested, and the measured results showed that the scan angle can be more than 15 degrees, and the side lobe levels are -12 dB. Details of the antenna design and experimental results are presented. (C) 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:829-833, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26634

A C-band wide-band 2-dimensional scanning solid-state active phased array antenna for airborne synthetic aperture radar(SAR) is designed.Microstrip patch is used and excited by a wide-band dipole.Metal walls and metal grounding screws are used to reduce the mutual couplings between microstrip antenna elements.The measure results indicate that the bandwidth of the antenna exceeds 800 MHz(VSWR<1.6).

An integrated beam synthesis algorithm is presented to optimize the multiple beams of variable look-angle SAR antenna. With an iterative solution scheme of improved projection matrix algorithm, the amplitude excitations (common to all beams) and the phase of such excitations (corresponding to each radiated beam) are determined simultaneously. Antenna beams are controlled by phase only in SAR system. The sample application of multiple beams SAR antenna design is given to illustrate the effectiveness of the presented algorithm. And the noise-equivalent sigma-zero (NEσ 0 ) of SAR system is improved as well.

A design procedure for directional circularly polarized micro-strip antenna array is given.By designing an array composed of 32 circularly polarized antenna elements at 2.45GHz,a proper method for designing such an array with integrated feeding network and directional high-gain was given,and the conundrums such as complicacy of the feeding network and difficulty in realization are solved.Measurements are also carried out,which indicate the validity of this method.

实施网络财务给企业带来利益的同时也给企业内部控制带来新问题.建立适应互联网环境的内部控制,其措施应基于企业的内部网络和外部网络两大方面来进行.

随着全球信息技术的飞速发展,会计信息系统的道德性、开放性、失真性和流动性造成的风险愈加明显。本文就实现会计电算化运用电子信息技术手段建立内部会计控制系统,确保内部会计控制的有效实施,提出相应的对策。