毕业设计（论文）-多普勒雷达的高精度测速弹道系数仿真研究

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1、沈阳理工大学应用技术学院毕业论文摘要针对连续波多普勒雷达外弹道测速的特点。为了解决频率分辨率与采样频率影响多普勒雷达速度测量精度的问题，提出应用快速傅里叶变换的频谱分析法。该方法基于目标弹道升、降规律对估计频率进行线性调整，能有效提高多普勒雷达的作用距离、测试精度和抗干扰能力，避免由于频率分辨率不够而出现连续相同的速度值。利用信号相邻两次截断后的频谱相位信息能提高频率估计精度。仿真结果和外场试验表明该方法在较低信噪比下，仍可以得到很高的频率估计精度。利用多普勒雷达的高精度测速信息，对弹道系数进行了仿真研究，分析了雷达的测量精度对弹道系数估计误差的影响。仿真

2、结果表明，引入测速信息能大幅度提高弹道系数的估计精度，在一定的雷达测量精度下，基于弹道系数特性的识别速度快，精度高，简单直观，具有现实价值。关键词：多普勒；阻力系数；快速傅里叶变换；雷达测量；精度；49沈阳理工大学应用技术学院毕业论文AbstractAccordingtothefeatureofexteriorballisticvelocitymeasurementforcontinuouswaveDopplerradar，inordertosolvetheproblemthatthefrequencyresolutionandthesamplingfre

3、quencymaybringnegativeeffectsOilthevelocitymeasurementprecision，frequencyspectrumanalysisbasedonfastFouriertransformisused．Alinearadjustmentmethodoffrequencyestimationisproposedaccordingtotheascendingordescendingprincipleoftargetexteriortrajectory．Themethodimprovesthemeasuringdist

4、anceandprecisionandtheanti-jammingabilityofthesystemandavoidstheappearanceofcontinuouslysamevelocityfrominadequatefrequencyresolution．Thefrequencyestimationprecisionisimprovedusingthefrequencyspectrumphaseinformationofadjacentcontinuoustruncationofthesignal．Thesimulmionandpractica

5、lresultshowthathighfrequencyestimationprecisioncanbeobtainedevenatalowsignalnoiseratio．UsingtheDopplerradar’Shighprecisionvelocityinformation，theballisticcoefficient’scharacteristicofreentryprocessisemulatedandresearched．Theeffectofradarprecisiontotheballisticcoefficientestimateis

6、analyzed．Theresultshowsthattheprecisionofballisticcoefficientishighlyadvancedwiththevelocityinformation，andunderacertainmeasurementprecisionofradar，itisfast，simpleandintuitionistictoidentifytargetsbyusingtheballisticcoefficentcharacteristics．Itisfeasibletorecognizethemissilebytheb

7、allisticcoefficient.Keywords：Doppler；dragcoefficient;fastFouriertransform;measurementofradar；precision49沈阳理工大学应用技术学院毕业论文目录绪论······························································1第一章多普勒雷达测速法的试验知识··································61.1适用范围····································

8、················61.2试验设备、装置及其要求··