CAJ | 학술논문

线性调频信号是脉冲压缩雷达中一种重要的脉冲压缩雷达信号,但当前的瞬时测频系统无法对其检测,更无法检测交叠信号.以瞬时测频系统为基础,分析了单线性调频信号和交叠线性调频经过瞬时测频系统的理论输出,据此提出了一种改进IFM系统的思路和解算交叠线性调频信号方法.新方法用模数转换器(ADC)对前沿未交叠的I、Q输出值进行量化和连续时间采样,得到一个信号离散频率值,应用LMS算法估计出其初始频率和调频斜率.以此为基础,根据交叠部分的I、Q输出值,估计出另一个信号参数.由Matlab/Simulink仿真验证可知,新方法能够估计两交叠线性调频信号的参数.
선성조빈신호시맥충압축뢰체중일충중요적맥충압축뢰체신호,단당전적순시측빈계통무법대기검측,경무법검측교첩신호.이순시측빈계통위기출,분석료단선성조빈신호화교첩선성조빈경과순시측빈계통적이론수출,거차제출료일충개진IFM계통적사로화해산교첩선성조빈신호방법.신방법용모수전환기(ADC)대전연미교첩적I、Q수출치진행양화화련속시간채양,득도일개신호리산빈솔치,응용LMS산법고계출기초시빈솔화조빈사솔.이차위기출,근거교첩부분적I、Q수출치,고계출령일개신호삼수.유Matlab/Simulink방진험증가지,신방법능구고계량교첩선성조빈신호적삼수.
Linear Frequency Modulation (LFM) signals is an important intra-pulse modulation signal of pulse compression radar,but current IFM system can not detect this signal,at the same time overlapping signal can not be detected in IFM system. So based on IFM system,this paper analyzes theoretical output of single and overlapping LFM signal through IFM system. On the basis of this,an improved idea and algorithm are put forward,that can estimate parameters of overlapping LFM signal. New method uses Analog To Digital Converter (ADC)parts to make quantitative and continuous time sampling to frontier un-overlapping output value of the two orthogonal channel (I/Q),and gets discrete frequency values of one signal,at last used LMS algorithm to estimate initial frequency and frequency modulation slope of this LMF single. Based on this,according to the overlapping output values of I/Q, parameters of another signal is estimated. Simulation validation of Matlab/Simulink show that this method can estimate parameters of two overlapping singles.