摘要
在分析遥测接收系统工作原理的基础上,深入研究了CORDIC(COordinate Rotation Digital Computer)算法的解调技术.当输入为正交中频(IF)信号和对应的时钟信息时,输出即为输入瞬时信号对应的瞬时相位,但在信道没有延迟时,其抗噪性能不如相干解调.在此基础上设计了一种改进的CORDIC差分鉴频解调算法,得到瞬时相位后,在数字域作1阶差分完成信号鉴频,保证了在信道没有延迟的情况下信号的抗噪性能.通过仿真实验证明了算法的合理性.
Based on the fundamental principle of telemetry receiving system, the CORDIC （COordinate Rotation Digital Computer） demodulation algorithm is comprehensively investigated. When the system input is an orthogonal IF （intermediate frequency） signal as well as its corresponding clock information, the system output is the instantaneous phase corresponding to the input transient signal. However, the anti-noise performance of the CORDIC demodulation is interfier to the coherent demodulation with the absence of channel delays. To this end, an improved CORDIC differential frequency discriminator demodulation algorithm in which the first-order difference is used in the digital domain for completing the signal frequency discrimination with the obtained instantaneous phase, is put forward to ensure the anti-noise performance of the signals in the channel without delays. Finally, the simulation results demonstrate the efficiency of the algorithm.
出处
《信息与控制》
CSCD
北大核心
2012年第4期459-464,471,共7页
Information and Control
