评述了GPS技术目前存在的问题，包括与SLR测量之间存在的系统偏差、GPS技术本身可能存在的周年变化和GPS卫星天线相位中心的变化。
The main problems in GPS technology including the system bias to SLR, its own annual variety and the change of GPS satellite antenna phase center are also discussed.
本文是为了解决定向天线的相位中心问题，为侦测合一系统设计提供参考而展开研究的。
This paper is worked to solve the phase center of the directional antenna, accordingly to giving some references for the interception and Direction-finding system.
菲涅尔区相位修正平面天线是一种用于高功率毫米波发射系统的新型平面天线形式。
Fresnel zone phase correcting plate antenna is a new type of planar antenna which is used in high-power millimeter-wavelength radiation system.
本文分析了机载雷达相位中心偏移天线(DPCA)系统的杂波相关矩阵，讨论了系统的最佳改善因数以及系统参数对性能的影响。
This paper presents analyses of the clutter correlation matrix, optimal improvement factor and effects of parameters of an airborne radar displaced phase center antenna (DPCA) system.
本文为系统设计和进一步研究天线相位中心偏移方位多波束系统的成像处理方法提供了参考。
The paper provides the reference for system design and further studying on imaging algorithm of displaced phase centers multiple azimuth beam SAR.
随后又对智能天线的零陷问题进行了相应的研究，并在相位扰动形成零陷的基础上引入了干扰角度扩展思想，使得系统零陷得以展宽，系统性能有了一定的改观。
After that we research on smart antenna null question and advance the antilogy of angle extend based on phase interference arithmetic, it extend system null and ameliorate system capability.
随后又对智能天线的零陷问题进行了相应的研究，并在相位扰动形成零陷的基础上引入了干扰角度扩展思想，使得系统零陷得以展宽，系统性能有了一定的改观。
After that we research on smart antenna null question and advance the antilogy of angle extend based on phase interference arithmetic, it extend system null and ameliorate system capability.
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