连续相位调制解调器的线性调频信号延时补偿方法  

Time Delay Compensation Method of Linear Frequency Modulation Signal for Continuous Phase Modem

作　　者：毛一梦 MAO Yi-meng(College of Electronic Science and Technology, Xiamen University, Xiamen 361005, China)

机构地区：[1]厦门大学电子科学与技术学院,福建厦门361005

出　　处：《中北大学学报（自然科学版）》2021年第6期495-501,514,共8页Journal of North University of China(Natural Science Edition)

摘　　要：现有的相位调制解调器补偿方法采用相位和控制频率相结合的补偿方式补偿线性调频信号时,由于计算时频率偏移估计值较大,导致解调器输出响应信号与给定输入信号的拟合度较低.基于此,提出了连续相位调制解调器的线性调频信号延时补偿方法.计算了连续相位调制解调器发送信号、信号携带相位和基带信号,建立了解调器模型;基于解调器模型,计算了线性调频信号和线性调频延时信号,确定了信号调频斜率以及瞬时频率与时间关系,分析线性调频信号延时的原因;计算了解调器总体相位、接收信号和频率偏移估计值,调整了频率偏移估计值的误差,当频率偏移估计值最小时,即可采用相位和频率补偿线性调频频率,完成连续相位调制解调器的线性调频信号延时补偿.实验结果表明:在相位补偿方式、频率补偿方式、相位和频率相结合补偿方式中,本文所提方法相较同步信号电路延迟补偿方法和基于CAN FD总线的补偿方法,补偿信号的幅值分别提高1.6 V和0.4 V,0.8 V和0.5 V,3 V和1 V,解调器输出响应信号与给定输入信号的拟合度更高.The current compensation method of phase modem adopts the compensation method of combining phase and control frequency.When compensating linear frequency modulation(LFM)signal,the estimation value of frequency offset was large,which led to low fitting degree between the output response signal of the demodulator and given input signal.Based on this,a delay compensation method of LFM signal was proposed.The model of demodulator was established by calculating the signal sent by continuous phase modem,signal carrying phase and baseband signal;based on demodulator model,the linear frequency modulation signal and LFM delay signal were calculated,the frequency modulation slope of the signal was determined,the relationship between instantaneous frequency and time was determined,and the delay reason of LFM signal was analyzed;the total phase,receiving signal and frequency offset estimation value of demodulator were calculated,and the error of frequency offset estimation was controlled.When the estimated value of frequency offset was the lowest,the phase and frequency can be used to compensate the LFM frequency,and the delay compensation of the LFM signal of continuous phase modem can be completed.The experimental results show that in the pattern of phase compensation,frequency compensation and compensation combining phase with frequency,by using the new method proposed in this paper,the amplitude of the compensation signal is increased 1.6 V and 0.4 V,0.8V and 0.5 V,3 V and 1 V,respectively,and the fitting degree of the demodulator output response signal is higher than the delay compensation method of synchronous signal circuit and compensation method based on CAN FD bus.

关 键 词：连续相位调制 解调器 线性调频 信号延时 延时补偿 相位 

分 类 号：TN972[电子电信—信号与信息处理]