초록 ▼

A false alarm rate is maintained at or below a desired rate over a fluctuating mean noise level for providing additional sensitivity and increased range performance in a constant false alarm rate (CFAR) circuit in a radar system by: utilizing a variable CFAR detection threshold level for distances o

A false alarm rate is maintained at or below a desired rate over a fluctuating mean noise level for providing additional sensitivity and increased range performance in a constant false alarm rate (CFAR) circuit in a radar system by: utilizing a variable CFAR detection threshold level for distances out to the radar's horizon; and, for distances beyond the radar's horizon, utilizing a relatively low fixed CFAR detection threshold level in place of the variable CFAR detection threshold level when there are no environmental factors present that produce additional radar returns.

대표청구항 ▼

[ I claim:] [1.] A method of maintaining a false rate at or below a desired false alarm rate over a fluctuating mean noise level so as to provide additional sensitivity and accordingly increased range performance in a constant false alarm rate (CFAR) circuit in radar system, comprising the steps of:

[ I claim:] [1.] A method of maintaining a false rate at or below a desired false alarm rate over a fluctuating mean noise level so as to provide additional sensitivity and accordingly increased range performance in a constant false alarm rate (CFAR) circuit in radar system, comprising the steps of:utilizing a variable CFAR detection threshold level for distances out to a predetermined range; andfor distances beyond said predetermined range, utilizing a predetermined relatively low fixed CFAR detection threshold level in place of the variable CFAR detection threshold, said fixed threshold level having a value less than about 99% of the variable CFAR detection threshold levels, andwherein the fixed threshold level is a function of range, weather, radio frequency interference and false targets.