Improvements in and relating to radars
AssigneeBAE SYSTEMS plc
InventorEllis Robert Humphreys
Life of this patent
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Abstract
Disclosed is a RADAR system comprising a Constant False Alarm Rate, CFAR, function, wherein the CFAR function is arranged such that a detection threshold is determined at least partly on the basis of a window length which is of a variable length and the variable length is determined on the basis of a degree of variability in a first number of previous amplitude measurements of received signals.
Claims20
A RADAR system comprising a Constant False Alarm Rate (CFAR) function, wherein the CFAR function is arranged such that a detection threshold is determined at least partly on the basis of a window length which is of a variable length and the variable length is determined on the basis of a degree of variability in a number of previous amplitude measurements of received signals.
A method of Constant False Alarm Rate (CFAR) signal processing in a RADAR system, the method comprising:
- determining a degree of variability in a first number of previous amplitude measurements of received signals;
- assigning a CFAR window length on the basis of the determined degree of variability;
- and
- setting a detection threshold for CFAR operation on the basis of the assigned window length.
A RADAR system comprising a Constant False Alarm Rate (CFAR) function, wherein the CFAR function is arranged such that a detection threshold is determined at least partly on the basis of a window length which is of a variable length and the variable length is determined on the basis of a degree of variability in a number of previous amplitude measurements of received signals, wherein the window length is arranged to be longer for a relatively lower degree of variability, and shorter for a relatively higher degree of variability, and wherein the CFAR function is further arranged such that an amplitude of a received pulse in a current Cell Under Test (CUT) is compared to a plurality of recently received pulses to determine if the current CUT lies in an upper range of recently received pulses and, if so, a predetermined false alarm rate is applied for the current CUT, wherein the predetermined false alarm rate is lower than would be applied if the current CUT did not lie in the upper range.
Dependencies are inferred from the claim text.