摘要
针对目前合成孔径雷达(SAR)目标模拟器通常只能模拟点目标,且通用化程度和实时性较低的问题,提出了一种基于商用现成品或技术(COTS)的SAR分布式目标模拟方法。利用NI PXI平台构建了一个基于电磁仿真的SAR分布式目标模拟器,由电磁仿真软件模拟获取目标散射特性,并通过高速网口输入硬件设备进行采样及卷积操作得到仿真SAR回波数字信号,经数模转换模块完成对SAR数字信号的调制并输出模拟回波,可以直接用于SAR系统的数据验证。模拟器采用数字式一体化硬件设备,由NI PXIe-5646R和PXIe-5840进行信号的接收和发送,PXIe-7902作为系统核心进行高速实时数据运算。系统以现场可编程门阵列(FPGA)为核心,通过LabVIEW RT(Real Time)和FPGA模块直接进行访问,能实时、高速地采集和处理数据。经过测试,该目标模拟器可以生成分布式目标的射频回波信号,环路验证结果证明了本文提出方法的有效性。另外,本文提出的方法适用于多种雷达信号的模拟,通过设置不同的信号体制或接收外部信号输入,可以实现灵活的SAR目标模拟。
Aiming at the problem that the current synthetic aperture radar(SAR) target simulator can only simulate point target objects with low generalization and real-time performance,a novel SAR distributed target simulation method based on commercial off-the-shelf(COTS)is proposed in this paper. NI PXI platform is adopted to design and build the SAR target simulator based on electromagnetic simulation. The target scattering characteristics can be simulated by computational electromagnetic simulation software. The high-speed network port is applied to link the hardware equipment,and perform sampling and convolution operations to obtain a simulated digital SAR echo,which can be directly used for data verification of the SAR system. The simulator contains several digital integrated equipment,such as NI PXIe-5646 R and PXIe-5840 for signal reception and transmission,and PXIe-7902 as the core of the system for high-speed real-time data operations. The FPGA-centered system can be directly accessed through LabVIEW RT(Real Time) and FPGA modules to achieve real-time high-speed data acquisition and processing.Experimental results demonstrate the effectiveness of proposed method. In addition,it is suitable for the simulation of a variety of radar signals. Flexible SAR target simulation can be realized by setting different signal systems or receiving external signal input.
作者
徐稼轩
朱占宇
王海鹏
王峰
XU Jiaxuan;ZHU Zhanyu;WANG Haipeng;WANG Feng(Key Laboratory for Information Science of Electromagnetic Waves,Fudan University,Shanghai 200433,China)
出处
《上海航天（中英文）》
CSCD
2020年第6期11-20,共10页
Aerospace Shanghai（Chinese&English）
基金
国家重点研发计划(2017YFB0502703)
上海航天科技创新基金(SAST 2019-073)。
