| 基于卡尔曼滤波的IFM系统测量LFM信号载频方法 |
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| 引用本文： | 张雷,李广强.基于卡尔曼滤波的IFM系统测量LFM信号载频方法[J].舰船电子对抗,2021,44(1). |
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| 作者姓名： | 张雷 李广强 |
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| 作者单位： | 解放军95865部队,北京102218;空军预警学院,湖北武汉430019 |
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| 摘 要： | 现代雷达广泛使用线性调频(LFM)信号,而雷达对抗侦察中传统的瞬时测频(IFM)系统却无法分析测量LFM信号的脉内频率信息,限制了IFM系统的使用。采用在IFM系统中微波鉴相器输出I、Q正交信号后加入模数转换器(ADC)和卡尔曼滤波器的方法,对传统IFM系统进行了优化改进,不但实现了对LFM信号脉内频率和调频系数的测量,而且有效减小了测量误差,最后通过仿真验证了方法的有效性。
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| 关 键 词： | 瞬时测频 线性调频 卡尔曼滤波 |
A Method of IFM System Measuring The Carrier Frequency of LFM Signal Based on Kalman Filtering |
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| ZHANG Lei,LI Guang-qiang.A Method of IFM System Measuring The Carrier Frequency of LFM Signal Based on Kalman Filtering[J].Shipboard Electronic Countermeasure,2021,44(1). |
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| Authors: | ZHANG Lei LI Guang-qiang |
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| Institution: | (Unit 95865 of PLA,Beijing 102218,China;Air Force Early Warning Academy,Wuhan 430019,China) |
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| Abstract: | Linear frequency modulation(LFM)signals are widely used in modern radar system,however the traditional instantaneous frequency measurement(IFM)system of radar countermeasure reconnaissance cannot analyze and measure the intro-pulse frequency information of LFM signal,which limits the use of IFM system.In this paper,through adding analog-to-digital converters and Kalman filter after the output of I/Q orthogonal signals through microwave phase-detectors in IFM System,the traditional IFM system is improved.By this method,the intro-pulse frequency and the frequency-slope modulation coefficient of LFM signal are measured,and the measurement error is reduced effectively.FInally,the validity of this method is verified through simulation. |
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| Keywords: | instantaneous frequency measurement linear frequency modulation Kalman filtering |
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