Patent ID: 7696919

Claim:
A system for warning a helicopter of an approaching bullet using existing sensor systems, said system comprising: means for transmitting an RF signal; means for receiving RF signals; means for detecting a small arms weapon firing from at least one location in the vicinity of a helicopter; means for providing a bearing from said helicopter for said at least one location where said small arms weapon firing was detected; means for determining a detection area and detection time window for a bullet fired from said small arms weapon; means for determining at least one antenna of said means for transmitting an RF signal and said means for receiving RF signals that are covering a sector including said bearing of said detected small arms weapon firing; means for determining a timing sequence and allocating at least one time segment for transmitting said RF signal and at least one time segment for receiving RF signals during said detection time window, means for commanding said means for transmitting an RF signal to emit said RF signal at a predetermined frequency during said at least one time segment allocated for transmitting said RF signal; means for commanding said means for receiving RF signal to receive RF signals near said predetermined frequency during said at least one time segment allocated for receiving RF signals; means for processing RF signals received during said at least one time segment allocated for receiving RF signals; means for determining whether an RF signal reflected from said RF signal emitted from said means for transmitting said RF signal is present in said RF signals received during said at least one time segment allocated for receiving RF signals, and means for outputting a warning where said RF signal reflected from said RF signal emitted from said means for transmitting said RF signal is detected.