一种基于数字接收机的信号调制方式识别技术

A Digital Receiver-based Signal Modulation Recognition Technique

针对侦察接收机信号调制模式识别问题,提出一种基于全数字接收机理论的信号调制方式识别技术,结合AGC、FFT、位同步环和载波跟踪环技术,能够有效识别输入信号强度、载波频率动态变化的BPSK、QPSK和FSK信号。利用载波跟踪环路频率跟踪曲线完成FSK和PSK识别,利用解调的基带数据完成BPSK和QPSK识别。在Altera公司的Stratix II器件EP2S180F1020C4上利用该方法完成实现,并对中国电子集团提供的空口信号进行识别验证。理论分析和仿真结果表明,该方法在保证识别率的同时可降低算法复杂度,易于硬件实现。

In this paper a signal modulation pattern recognition technology based on all-digital receiver theory is proposed to solve the signal pattern recognition problem in reconnaissance receivers.The proposed method combines AGC,FFT,bit synchronization loop and carrier tracking loop technology,and can identify BPSK,QPSK,and FSK signals with dynamic input energy and carrier frequency.The proposed method utilizes the frequency tracking curve of the carrier tracking loop to identify the FSK and PSK signal,and then uses the demodulated baseband data to complete the identification of BPSK and QPSK signal.The proposed method has been implemented on Altera's Stratix II device EP2S180F1020C4,and verified the air interface signal provided by China Electronics Group.Theoretical analysis and simulation results show that the proposed scheme reduces the complexity of the algorithm while ensuring the recognition rate,and it is easy to implement in hardware.