CAJ | 학술논문

线性调频（LFM）信号是当前雷达广泛应用的一种信号形式。传统的瞬时测频（IFM）系统无法分析LFM信号的内部频率情况，所以会影响对LFM信号的测频准确性。通过简要介绍IFM的基本原理，分析了多路鉴相器组合的IFM系统的解频率模糊方法。在此基础上建立IFM系统处理LFM信号的模型，分析了引起IFM系统对LFM信号测频误差的原因。通过对理论分析结果进行仿真验证，为工程实际中的瞬时测频技术提供了理论参考。
선성조빈（LFM）신호시당전뢰체엄범응용적일충신호형식。전통적순시측빈（IFM）계통무법분석LFM신호적내부빈솔정황，소이회영향대LFM신호적측빈준학성。통과간요개소IFM적기본원리，분석료다로감상기조합적IFM계통적해빈솔모호방법。재차기출상건립IFM계통처리LFM신호적모형，분석료인기IFM계통대LFM신호측빈오차적원인。통과대이론분석결과진행방진험증，위공정실제중적순시측빈기술제공료이론삼고。
Linear frequency modulation(LFM)signal is a signal form widely used by radars. Since the traditional instanta?neous frequency measurement(IFM)system is unable to analyze the internal frequency structure of LFM signal,which can influence the frequency measurement accuracy of LFM signal,the fundamental of IFM is introduced briefly,and the frequency ambiguity reso?lution method of IFM system with multi-channel phase discriminators is analyzed. Based on this,the model of processing the LFM signal by IFM system was established,and the reason why frequency measurement error of LFM signal is generated by IFM system was analyzed. The results of theoretical analysis were simulated and verified,which provided a theoretical reference for IFM technology in engineering application.