| 摘要 |
<p>PURPOSE:To achieve a higher freedom by controlling the number of averaging cells and guard cells in substance by an external control with a simple circuit. CONSTITUTION:First, selectors 32c and 31c output zeroes under control of a Constant False Alarm Rate (CFAR) control circuit 35 and data a0, a1... and aM are supplied to a terminal I of an adder 30. The data are added up and an initial value A(0)=a0+a1+...+aM is taken out at a terminal II to be stored into RAMs 32a and 31a. When the data A(0) arrives at the terminal I, a data aM+1 at the terminal II and a data a0 at the terminal III, a sector 30d selects the data arriving at the terminal II under control of the circuit 35. On the other hand, a selector 30e selects the data arriving at the terminal I under control of the circuit 35 and a selector 20f performs an adding operation in which no output of an adder 30c is selected and a subtracting operation of the selectors 30d and 30f at different timings using only one adder 30c.</p> |
