【摘要】 本文介绍了ＰＤＡ系统的原理及应用，回顾并分析了时域和频域信号处理方法的优劣，提出了低信噪比条件下信号的检测、评估和高速处理方法，并详细说明了各部分的具体实现方法，模拟实验表明，本系统的处理速度和精度都已接近国际先进水平。更多还原

【Abstract】 This paper describes the principle and application of the Phase Doppler Anemometry (PDA). The relative performance of the current methods for Doppler signal processing is analyzed, these methods include the time domain processor and the frequency domain processor. A new method for the signal detection, validation and rapid processing at low SNR is presented and the circuits are fully examined. Simulation demonstrates that the present measurement system provides high data rate and precision which approach the international level.更多还原