Patent ID: 8474172
Filing Date: 2013-07-02
Classification: F41A

Abstract:
1. A RF system for preventing hunting accidents, which to achieve high resolution of said RF system, comprises: a RF transponder attached to a friendly target, which contains a millimeter-wavelength transmitter, which transmits a plain non-modulated RF signal via omnidirectional antenna, a RF interrogator mounted on a firearm, which contains a single-input millimeter-wavelength receiver comprising: wherein: RF interrogator sequentially receives said plain non-modulated RF signal by means of sequentially-switched said first receiving antenna and said second receiving antenna, so, if direction to said friendly target is angularly misaligned with said sightline, input signal of said single-input millimeter-wavelength receiver becomes amplitude-modulated with a frequency of switching, wherein depth of said amplitude modulation is proportional to said misalignment that allows determining angular position of said friendly target about said sightline; and, when said friendly target is in dangerous sector of fire, said alert light and said alert buzzer are activated.