你可以用虚坐标系统并且保持你的程序与硬件的距离，或者你可以用设备坐标系统而完全依赖于硬件。
You can use a virtual coordinate system and keep your program distanced from the hardware, or you can use the device coordinate system and snuggle right up to the hardware.
该方法采用传统的恒虚警率（CFAR）检测方法，但其门限设置是基于沿距离和多普勒单元功率谱值的回归分析。
It uses a conventional constant false-alarm-rate(CFAR) detection procedure but the thresholding scheme is based on regression analysis of power spectrum values along range and Doppler cells.
通过实验拟合提出了等效虚源法，该新方法可简便准确地预测体声源和面声源在不同距离的影响声级；
The new method can simply forcast noise level affected by volume source or area source at different distances.
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