In order to realize real-time and full-angle detection in laser warning system

and make the structure simple and stable under the condition of the precision of detection angle is determined

multi-window code fiber-optic antenna measurement method is proposed.The system sets special wide field fiber optic receiver ports in different directions

and then couples the fibers to PIN detectors.The direction of incidence laser is obtained by the detecting circuit.Under laboratory conditions

using attenuated narrow pulse laser to measure the optical fiber acceptance angle and acceptance circuits.Experimental results show that signal strength attenuated to-3 dB

compared with the 0° incidence angle

when the deflection angle was ±30°.Precision of peak hold circuit was surpasses 2 %.The circuit fitted for detecting weak narrow pulse laser（1 mW/cm2）

detection false rate was 0.15 %

which can meet the design requirement of laser warning system.