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高轨SAR具有覆盖范围广,重访时间短的优势。但是如果采用高轨SAR卫星同时作为发射机和接收机,不能充分发挥高轨SAR的这些优点。采用飞机或低轨卫星作为接收机平台不但能够更灵活地针对目标区域成像,而且分辨率也将大大提高。但是星机双基SAR(BiSAR)的几何构型复杂,难以直观地获知任意几何构型BiSAR的分辨率特性。该文从BiSAR基平面分辨率出发,根据几何构型得到基平面分辨率与地平面分辨率之间的几何关系,解析地表示出了BiSAR在地平面上的分辨率形状。据此可以评估BiSAR系统的分辨力,并且能够通过优化设计系统带宽和合成孔径时间两个参数使得BiSAR系统能够实现更好的分辨率特性。最后,仿真结果验证了方法的有效性。 相似文献
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频率源稳定性对BiSAR成像的影响研究 总被引:4,自引:0,他引:4
高稳定度的频率源是实现双站合成孔径雷达(BiSAR)系统相位同步的基础,该文研究分析了 收、发系统独立频率源条件下不同类型的频率误差对BiSAR成像的影响,确定了BiSAR成像的频率源稳定性要求。最后,给出了计算机仿真的结果。 相似文献
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基于数据流处理的雷达对抗仿真系统通过模拟雷达和雷达对抗装备各个关键环节和功能模块对信号/数据流的处理过程,建立完整的雷达与雷达对抗装备之间信息流动与处理的动态闭环仿真环境,为研究雷达的抗干扰能力和雷达对抗装备的下扰能力提供了灵活的仿真试验平台。文中提出了基于数据流处理的雷达对抗仿真系统的基本设计思路,并结合实例介绍了部分仿真模型的实现方法。 相似文献
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认知雷达作为一种全新的智能化雷达概念,可以有效提升雷达在复杂地理和电磁环境中的探测性能,被认为是未来雷达发展的方向。文中探讨了认知雷达概念提出的背景,分析了认知雷达的基本内涵和概念,并提出了认知雷达层次化、全自适应的系统架构和处理流程,给认知雷达的研究和系统研制提供可借鉴的思路。 相似文献
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针对复杂电磁环境中雷达侦察信号自适应处理的需求,对雷达信号侦察问题进行了建模与分析,讨论了若干可能的自适应侦察信号处理架构。在雷达侦察信号处理模块算法方面,研究了特征自适应检测与分析、信号自适应分选等处理架构,以提升低可识别信号的自适应处理能力;在侦察系统处理流程方面,研究了具有跟踪与预测能力的自适应处理架构,以增强对电磁环境态势的动态感知能力;在侦察系统与其他分系统协作层面,研究了基于雷达系统抗干扰需求和干扰机智能化干扰需求的自适应侦察协作架构,以提升电子战系统效能。该研究可为自适应雷达对抗处理研究提供有益思路。 相似文献
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Tian-Ge Shao Jian-Guo Wang 《中国电子科技》2007,5(3):255-259
In this paper, the spatial resolutions at different directions of bistatic synthetic aperture radar (BiSAR) have been derived from the ambiguity function. Compared with monostatic signal to noise ratio, BiSAR's resolutions of a fixed point target are varying with slow time since BiSAR system is space-variant. Constraints for the assumption of space-invariant bistatic topology are proposed in the paper. Moreover, under the assumption of invariance, the change of resolutions at different point in the image scene is taken into account, and we have specified two key parameters that affect resolutions directly and analyzed the way how they influence on the resolutions. 相似文献
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双站合成孔径雷达系统同步问题研究 总被引:6,自引:2,他引:4
讨论了双站合成孔径雷达 (双站SAR)收、发系统的同步问题 ,详细分析了频率源稳定性对收发系统间相位同步的影响 ,并给出了计算机仿真结果 相似文献
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In this paper, we propose a simplified spatial channel sounding method by utilizing bistatic synthetic aperture radar (BiSAR) principles. Despite the different deployment geometries compared with a conventional BiSAR system, the feasibility of the approach is established by 1) the proposed method achieves a better spatial resolution than conventional directional channel sounders and 2) reconstruction algorithms based on time-domain back-projection in conjunction with a digital elevation model provide a good imaging performance and are suitable for reconstructing the spatial distribution of scatterers. Simulations of a high-speed rail (HSR) scenario demonstrate that the estimated power delay profiles (PDPs) and power angle profiles (PAPs) are close to the actual values. 相似文献
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现代雷达设计约束与技术发展趋势浅析 总被引:1,自引:0,他引:1
电子侦察技术发展与雷达行业密切相关,侦察技术研究必须紧跟雷达技术发展的步伐,使侦察接收机始终能够适应辐射源信号环境。文章从电子侦察关注问题的角度对雷达约束限制进行讨论,对雷达设计约束和现代雷达的技术发展趋势进行了归纳总结,希望为电子侦察系统工程研制和技术发展带来一些启发。 相似文献
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Li Ding Yangyang Ye Guoyao Ye Yiming Zhu 《Journal of Infrared, Millimeter and Terahertz Waves》2018,39(11):1162-1173
Considering the difficult transceiver-isolation problem of the monostatic synthetic aperture radar (SAR) in the terahertz (THz) band, this paper proposes a compact THz bistatic SAR (BiSAR) geometry. The system allows the separately distributed transmitter and receivers. At the receiving end, there are a direct-wave receiver and an echo receiver, both operating at the heterodyne and in-phase mode. The echo receiver runs along a linear rail to fulfill the scene scanning, while the direct-wave one is fixed as a reference. Furthermore, assuming that the receivers are synchronized, both the problem of synchronization between the separated transmitter and receivers and the problem of timing at the signal acquisition would be solved by utilizing the high coherence between the echo and the direct wave. Based on such a system, the application of THz BiSAR for one-dimensional imaging is taken into consideration. Then, a high-resolution imaging algorithm is proposed benefitting from the total least squares estimating signal parameters via rotational invariance techniques (TLS-ESPRIT) and the spatial smoothing process (SSP). The imaging performance is then demonstrated by both simulations and the experiments in the 0.183 THz. 相似文献
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Wenqin Wang 《Geoscience and Remote Sensing, IEEE Transactions on》2007,45(9):2695-2700
The use of a novel synchronization link to compensate time, phase, and spatial synchronization errors is proposed, aiming at the development of a practical synchronization technique for bistatic synthetic aperture radar (BiSAR) real-time imaging. With the proposed technique, an amplitude-modulated signal emitting from the transmitter is received by a passive receiver and divided into two channels. One is passed through an envelope detector and then used to trigger the sampling clock, and the second is used to achieve spatial synchronization and phase synchronization. Finally, the residual time synchronization errors are compensated with a proposed high-precision range realignment method, and the residual phase synchronization errors are compensated with autofocus algorithms. This technique allows a passive receiver, which is teamed with an illuminator at a safe standoff distance, to receive the data reflected from potentially hostile areas of interest. Thus, this configuration, making real-time imaging possible, has a particular value in military applications. Simulation results show that successful adaptive synchronization for BiSAR real-time imaging is possible by using this dedicated synchronization link. 相似文献
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双基地合成孔径雷达弹射式干扰研究 总被引:2,自引:0,他引:2
该文针对双基地SAR不同于常规SAR的工作方式,对双基地SAR弹射式干扰进行了研究,表明弹射式干扰可以有效地应用于双基地SAR的对抗。文中给出了双基地SAR弹射式干扰的信号模型,分析了固定转发时延弹射式干扰的原理和干扰效果,并研究了不散焦保护区与雷达参数的关系。计算机仿真验证了理论分析的正确性。 相似文献
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从不同角度分析和研究了现代雷达有源对抗系统中干扰资源的管理技术.指出了这一技术对现代雷达有源对抗系统的必要性和重要性。 相似文献