Research On Remote Wide Angle Trigger System Based On The Infrared Muzzle Flame

During the development of the weapon system,target testing is required for each technical index of the weapon to test whether these indicators meet the design requirements.When multiple devices are used for a test,a time reference is needed and the data is aligned and matched with multiple devices.The data is combined with the time axis to analyze and evaluate the weapon performance.In the test of the shooting range,the time when the projectile dies is generally used as the reference time.The moment the cannonball leaves the cannonball,it will be accompanied by a strong firelight.It will be used as a target to detect the available muzzle flash signal and serve as a time reference signal for all test equipment in the system.Because of the need of a certain type of weapon system test,the muzzle signal acquisition position must be far away from the shooting target position.The method of detecting the muzzle flash light was adopted,and in order to ensure that the target was within the field of view of the detection system,a remote wide viewing angle trigger system was studied.Based on the analysis of the characteristics of the muzzle flame,the overall scheme of the long-range wide-angle triggering system is designed.The infrared detector and the optical system are combined to realize the detection of the muzzle flame at a long distance.A remote infrared trigger system model was established to obtain the mathematical expr ession of the detection system's operating distance.The relationship between the factors affecting the system's operating distance and the effect distance was simulated.Through the analysis of the simulation results,the system design was optimized.The effects of solar and ground radiation,temperature,trees and other external environmental factors on the distance of the detection system were analyzed.Measures such as hood,cooling,and high-pass filtering were used to reduce the interference.According to the system design scheme,the design of the signal processing circuit and the design of the optical system were completed.The circuit includes a signal acquisition circuit,a filter circuit,an amplifying circuit,a threshold comparison circuit,an isolation circuit,a trigger signal output circuit,and a signal differential conversion transmission circuit,and completes the whole process of signal detection to remotely transmit the trigger signal.The optical system uses a large aperture and a plano-convex lens with a high infrared transmittance to obtain more flame radiant energy for the purpose of remote detection and a field of view for designing a wide viewing angle.Through a series of practical experiments,the comparison of the actual distance between the system and the theoretical distance under different signal-to-noise ratios was completed,and the attenuation law of the distance of the system under different atmospheric transmission rates was verified.In the shooting range test,the shooting test of rifles and artillery at different distances was carried out to determine that the trigger system can meet the design requirements,meet the requirements of the 1000 m detection distance in the weapon range test and the need for delayed triggering of different test equipment.