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基于双通道多输入多输出合成孔径雷达(multiple-input multiple-output synthetic aperture radar,MIMO-SAR)新体制,提出一种置换相位中心天线(displaced phase center antenna,DPCA)离散调频傅里叶变换(discrete chirp-Fourier transform,DCFT)实现运动目标的检测、定位和成像的方法。提出利用DCFT方法估计运动目标径向速度,考虑到线性调频信号通过DCFT处理后的单峰值特性,给出一种估计目标运动沿航向速度的快速搜索方法。由于同一多普勒中心频率在不同载频下的脉压位置不同,因而可以利用位置的比值来确定模糊次数,从而实现了运动目标的正确定位。在解模糊过程中,给出了载频设计分析。通过将传统双通道DPCA的一发多收体制扩展到双通道MIMO体制,不仅能够实现低信噪比情况下动目标检测,还可以完成动目标速度测量、定位和成像。
Based on the new dual-input multiple-output synthetic aperture radar (MIMO-SAR) system, a Discrete Phase Center Antenna (DPCA) Discrete Fourier Transform discrete chirp-Fourier transform, DCFT) to achieve the detection of moving targets, positioning and imaging methods. A DCFT method is proposed to estimate the radial velocity of the moving target. Considering the unimodal characteristic of the chirp signal after DCFT processing, a fast search method for estimating the target velocity along the heading is proposed. Because the same Doppler center frequency pulse pressure position under different carrier frequency, so you can use the location of the ratio to determine the number of fuzzy, so as to achieve the correct positioning of the moving target. In the process of defuzzification, the design of carrier frequency is given. By extending the traditional dual-channel DPCA transceiver system to a dual-channel MIMO system, it can not only detect moving targets at low signal-to-noise ratio, but also measure, locate and image moving targets.