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首发:山东省日照市莒县二模数学试题.docx


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国防科学技术大学研究生院学位论文
摘要
本文针对UHF波段特种体制雷达在研制和试验过程中50km以内杂波过多的特点,采用仿真和试验相结合的方法对该雷达的杂波抑制功能进行了分析研究。着重分析了GTC波形、杂波图对近区杂波的抑制效果;MTI、MTD抑制杂波的能力;影响信号处理机脉冲压缩的因素;恒虚警慢门限电路的改进;阵地的选择方法等几个方面的问题。研究结果表明,
选择合适的STC波形、正确使用杂波图对杂波的抑制效果明显;合理地选择MTI、MTD参数不但可以抑制固定杂波,还可以抑制低速运动杂波;改进后的恒虚警慢门限电路可以改变杂波剩余不稳定的问题;合理选择阵地也能减少近区杂波。该研究结果在UHF波段特种体制雷达应用后,杂波抑制功能得到明显改善。
【关键词1.- UHF波段,特种体制雷达,杂波抑制,脉冲压缩
国防科学技术大学研究生院学位论文
ABSTRACT
Using the methods bining simulation and experiments,the capability of clutter suppression in the special system radar at UHF-band is discussed in this thesis,aiming at the characteristic that the radar has tOO much clutter inside 50kin during its development and test.
Several issues are analyzed in detail,The issBes rise the effect of clutter suppression in near-zone by STC curve and clutter figure,the effect of clutter suppression by MTI and MTD,the factors that affect the pression in signal processor,the improvement of CFAR Slow threshold circuits,the methods of selecting study results show that the effect of clutter suppression is obvious when the STC curves are chosen appropriately and the clutter figures are used correctly,selecting the parameters of MTI and MTD reasonably not only can cancel immovable clutter but also Can cancel moving clutter at low speed,the CFAR Slow threshold circuits after improvement call ameliorate the clutter the terrain reasonably can a

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  • 页数6
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  • 上传人jiqingyong11
  • 文件大小16.28 MB
  • 时间2018-06-05