基于3×3耦合器的零差解调技术研究

Research on the Homodyne Demodulation Technology Based on 3×3 Coupler

基于3×3耦合器的零差解调方案解调电路简单,动态范围大,解调频带宽,是相位检测的优选方案。论文主要研究了基于3×3耦合器的零差解调技术。分析了三种典型解调算法的基本原理,并从采样率要求、系统动态范围、解调信号带宽、硬件规模和资源消耗等几个方面比较了它们的性能差异。仿真结果表明,反正切算法动态范围大,解调频带宽,性能优势明显,但消耗资源较多;NPS算法和正交解调算法动态范围、解调带宽一致,性能接近,但在硬件规模和对信号的适应性上各有优势与不足。论文的研究结论对于实际工程应用中零差解调算法的选择具有参考价值。

Homodyne demodulation scheme based on 3×3 coupler has simple demodulation circuit,large dynamic range and demodulation frequency bandwidth,which is the preferred scheme for phase detection. This paper mainly studies the homodyne demodulation technique based on 3×3 coupler. The basic principles of three typical demodulation algorithms are analyzed,and their performance differences are compared in terms of sampling rate requirements,system dynamic range,demodulated signal bandwidth,hardware scale and resource consumption. Simulation results show that the inverse tangent algorithm has a large dynamic range and demodulation bandwidth with obvious performance advantages but consumes more resources,the NPS algorithm and the quadrature demodulation algorithm have the same dynamic range and demodulation bandwidth with close performance,but each has advantages and disadvantages in terms of hardware scale and adaptability to the signal. The findings of this paper are of reference value for the selection of homodyne demodulation algorithms in practical engineering applications.