中文说明：极坐标下的分贝画图。matlab中极坐标画图函数为polar，但是无法画出转化为dB的图形，此函数为画db为单位数据的极坐标图形。
English Description：
Decibel plotting in polar coordinates. The polar drawing function in MATLAB is polar, but it can't draw the graph converted into dB. This function is to draw the polar graph with DB as unit data.