单频信号二维合成孔径成像算法

传统合成孔径雷达采用大带宽信号实现距离向分辨,采用一维合成孔径实现方位分辨,得到二维图像。在某些近场成像场合,成像分辨率要求很高,依靠信号带宽很难达到要求。提出了一种二维合成孔径成像系统,利用二维合成孔径实现二维分辨,分辨率取决于合成孔径长度,不受信号带宽的约束,可以实现超高分辨率。信号采用简单的单频信号,可使系统大大简化。详细推导了单频信号的二维合成孔径成像算法。仿真结果表明,单频信号二维合成孔径是一种有效的高分辨率成像技术。

Single Frequency Two-Dimensional Synthetic Aperture Imaging System and Imaging Algorithm

Traditional synthetic aperture radar uses wideband signal to achieve range resolution, and use one-dimensional synthetic aperture to achieve azimuth resolution, thereby form a two-dimensional image. In the cases of short range imaging, very high imaging resolution may be required, and it is difficult to achieve such high resolution using signal bandwidth. This paper proposes a two-dimensional synthetic aperture imaging system; it uses the two-dimensional synthetic aperture to achieve two-dimensional resolution. The resolution depends on the length of the synthetic aperture, and it is no longer limited by the signal bandwidth and can obtain ultra-high resolution. The transmitted signal is single frequency waveform, thus the system can be very simple. The imaging algorithm for the single frequency two-dimensional synthetic aperture imaging system is derived in detail in this paper. Simulation results shows that the single frequency two-dimensional synthetic aperture imaging system is an effective technique for high resolution imaging.