共查询到20条相似文献,搜索用时 31 毫秒
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Golestani K. Chandrasekar T. Keeler R.J. 《Geoscience and Remote Sensing, IEEE Transactions on》1995,33(2):239-246
Weather radars require long unambiguous ranges, high Nyquist sampling rates and good clutter suppression. In addition, polarization diversity is also used extensively, switching polarization of the transmit pulse on a pulse by pulse basis. This paper presents a dual polarized staggered pulse repetition scheme that can be used for Doppler and polarization diversity measurements in a weather radar. Processing algorithms for radar returns under this scheme are also presented. This pulsing scheme was implemented on the CP-2 radar operated by the National Center for Atmospheric Research. Experimental observations of convective storms using dual polarized staggered pulse repetition scheme in the Colorado front range were made and the results of the data analysis are presented 相似文献
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二相编码脉冲信号的距离多普勒信号处理 总被引:1,自引:0,他引:1
基于伪随机二相编码连续波和相干脉冲串信号的特点,提出一种脉间二相编码脉冲雷达信号及其处理的一般模型和等效简化模型,同时给出了该信号处理方法用于点目标的仿真结果。最后,结合雷达高度表回波信号的特点,较为详细地讨论了脉间二相编码信号在雷达高度表中的应用,也给出了仿真结果。 相似文献
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星载PD雷达的地杂波模拟 总被引:2,自引:2,他引:0
针对星载脉冲多普勒(PD)雷达的地杂波仿真问题,介绍了基于视频信号的模拟方法,并且给出了具体的计算公式、原理和步骤;从理论上分析了星载PD雷达的地杂波谱;最后通过仿真分析了主瓣杂波与天线视角的关系,以及主瓣杂波与地球转动之间的关系。其模拟结果与理论分析吻合较好,表明这种估算地杂波的方法精确有效。 相似文献
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介绍了脉冲压缩的原理和常用的脉压波形的4种形式,即:线性调频,非线性调频,四相码和二相码。这些信号是雷达发射的基本波形。结合工程实际,详细地分析了这4种波形在时域和频域脉压的实现方法,同时给出了数学上的表达式。这些方法已在多部雷达中应用,获得了良好效果。 相似文献
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PD雷达距离跟踪系统的计算机仿真 总被引:5,自引:1,他引:5
介绍一种机载脉冲多普勒(PD)雷达的自动距离跟踪方案,利用MATLAB/SIMULINK计算机仿真技术分析和研究了某机载PD雷达距离跟踪系统的原理和性能,详细阐述了所建距离跟踪系统仿真模型中各模块的功能和偏差计算电路的算法.该方案采用三波门跟踪,通过偏差计算电路和反馈控制电路使中间波门中心始终对准目标回波脉冲中心,完成距离跟踪.由仿真结果可知跟踪性能良好. 相似文献
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Byung-Kwan Kim Junhyeong Park Seong-Jin Park Tae-Wan Kim Dae-Hwan Jung Do-Hoon Kim Taihyung Kim Seong-Ook Park 《ETRI Journal》2018,40(2):188-196
This paper presents a pulse radar system to detect drones based on a target fluctuation model, specifically the Swerling target model. Because drones are small atypical objects and are mainly composed of non-conducting materials, their radar cross-section value is low and fluctuating. Therefore, determining the target fluctuation model and applying a proper integration method are important. The proposed system is herein experimentally verified and the results are discussed. A prototype design of the pulse radar system is based on radar equations. It adopts three different pulse modes and a coherent pulse integration to ensure a high signal-to-noise ratio. Outdoor measurements are performed with a prototype radar system to detect Doppler frequencies from both the drone frame and blades. The results indicate that the drone frame and blades are detected within an instrumental maximum range. Additionally, the results show that the drone's frame and blades are close to the Swerling 3 and 4 target models, respectively. By the analysis of the Swerling target models, proper integration methods for detecting drones are verified and can thus contribute to increasing in detectability. 相似文献
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多部雷达信号间的共信道干扰是目前雷达传感网等面临的电磁兼容问题。适合于窄带雷达运用的传统捷变频与编码分集等方法无法有效解决高分辨宽带雷达共信道干扰问题。文中提出了一种波形与时间双分集的复合设计方法,通过多元码脉冲位置编码、伪随机序列阵脉冲压缩和脉冲积累的复合体制,为较好解决宽带雷达间的共信道干扰提供了
一种解决途径。仿真结果表明在共信道信干比大于-30dB 的前提下,所提出的设计波形具有明显的干扰抑制能力,计算结果验证了该设计的可行性与高效性。 相似文献
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During incoherent scattering of a radar pulse from an extended volume region it is appropriate, because of transit-time considerations, to work with a virtual pulse which differs from the true (transmitted) pulse both in size and shape. We have determined the coordinate transformation leading to the virtual pulse for the general far-field case. The Gaussian spheroidal incident pulse is then considered as a prototype, and implications on measurements are discussed. 相似文献
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正交变换和脉冲压缩是雷达信号处理中常用的两个基本技术。介绍了正交变换和脉冲压缩的基本原理,并基于Matlab对线性调频信号先后做了这两种处理。其中涉及到采样率和匹配滤波器的选取及脉冲压缩处理中的旁瓣抑制问题,给出了计算机仿真结果。结果证明,脉冲压缩技术可以提高雷达的距离分辨力。 相似文献