Pei-Yu Lyu, C. Zhang, Sheng-Fuh Chang, Shih-Cheng Lin, Chia-Chan Chang
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引用次数: 0
摘要
提出了一种确定具有亚波长精度要求的毫米波近程传感雷达相位中心的新方法。考虑了天线结构和收发器相位延迟对相位中心的影响。根据调制应答器旋转扫描测得的相位图确定相位中心位置,并采用椭圆相位轮廓最小二乘拟合进行分析。应答器上的调制用于抑制本振相位噪声。椭圆相位轮廓拟合算法具有较好的拟合精度。实验实现了一个由两个4×4串联馈电贴片天线阵列和一个FMCW/CW收发芯片组成的24 GHz近距离传感雷达。该雷达的相位中心沿垂直于天线结构轴线方向为- 8 mm (0.64λo)。
Determination of the Phase Center of Sensing Radars Based on Elliptic Phase-Contour Fitting Method
A novel method for determining the phase center of a millimeter-wave short-range sensing radar with sub-wavelength accuracy requirement is presented. Both the antenna structure and transceiver phase-delay effects on the phase center are included. The phase center position is determined based on the measured phase pattern obtained by modulated-transponder rotational scan and analyzed by means of elliptic phase-contour least-square fitting. The modulation on the transponder is used for suppressing the local-oscillator phase noise. The elliptic phase-contour fitting algorithm gives better fitting accuracy. A 24 GHz short-range sensing radar, composed of two 4×4 series-fed patch antenna arrays and a FMCW/CW transceiver chip, is implemented for the experiment. The phase center of this radar is −8 mm (0.64λo) along the line perpendicular to the antenna structure axis.