Research On The Design Of The Actual Soldier Counter Photoelectric Detection System

In recent years,with the deepening of national defense modernization,photoelectric detection technology has been widely used in military,aviation,aerospace and other fields.As a typical application of photoelectric detection technology,the actual combat system has become the best practice of strengthening the army and army construction in the new era,which is very important in military training.The photoelectric detection system is an important part of the actual combat system.It is a photoelectric conversion and signal processing system based on photoelectric detection theory and optical communication principle.In the laser simulation combat system,the traditional photoelectric detection system is greatly affected by the environment,which leads to the unstable operation of the system and low detection efficiency.In order to ensure the detection accuracy of laser signal and improve the receiving performance of photoelectric signal,a gain adaptive photoelectric detection system based on digital filtering is designed according to the principle of photoelectric signal detection.It provides an important reference value for the performance optimization of real combat system.The main research contents and results are as follows:1.Theoretical analysis and scheme design of photoelectric detection system.The theoretical model and circuit model of photoelectric detection system are constructed.The working principle and basic composition of photoelectric detection system are analyzed.The influence of responsivity,quantum efficiency,frequency bandwidth,dark current,noise and noise equivalent power on the performance of photoelectric detection system is studied.The equivalent model of system noise is established,and the performance index and noise of the photoelectric detection system are emphatically analyzed.The root mean square analysis method is used to calculate the total noise output,and the main influencing factors of the system noise are screened out,which provides theoretical support for circuit design optimization.Based on the above analysis,the design requirements of the photoelectric detection system are proposed,and a reasonable system implementation scheme is formulated.Specific solutions are given for the key difficulties and key technologies of the scheme implementation.2.In order to solve the problems of large amplitude variation of output signal,inaccurate signal acquisition and error code,the stable output of signal is realized.According to the characteristics of laser communication and the influencing factors of system noise,the basic realization principle,realization method and specific circuit of each module in the system are designed and analyzed,and the relevant parameters are optimized.According to the principle of automatic gain control,an automatic gain control amplifier circuit is designed to adaptively amplify signals with different input amplitudes,so that the output signal is basically stable at about 2 V,and the error does not exceed 17.5%,thereby enhancing the efficiency and accuracy of signal acquisition.A laser receiving circuit with low noise,high response and stable system is designed to realize laser signal receiving,conversion and processing.3.In order to reduce the systematic and environmental noise influence,it is necessary to improve the efficiency of the system in detecting laser signals.Firstly,based on the optical principle of the lens,the optical design software Zemax is used to reasonably design the optical model of the photodetector probe cover,which is the theoretical basis for the design of the probe cover.The narrow-band filtering of the signal light is realized,and the background light and the concentrating effect are suppressed.Secondly,a low-pass filter circuit and a band-pass filter circuit are added to the circuit.The interference and DC component outside the required frequency range are filtered out by multiple filtering methods.The background noise is suppressed to14.75 μV,and the signal-to-noise ratio is improved to 96.2 d B.Finally,the digital filtering method based on fast Fourier transform greatly improves the signal processing effect,enhances the accuracy of signal acquisition and signal quality to a certain extent,and facilitates the subsequent decoding of signals.4.A combination of simulation and experiment was used to verify that the performance of the designed system meets the design requirements.TINA-TI was used to simulate and analyze the circuit,and the circuit frequency curve was flat without jitter,which proved the circuit performance was stable;the minimum optical power detectable by the system was 0.716 μW;the noise curve was flat without spikes,and the relationship between gain and control voltage matched the linear relationship derived from the circuit design,which theoretically proved the feasibility of the design.The system circuit PCB layout design and physical platform construction are completed,and the relevant performance of the system is tested and analyzed through experiments,which verifies the communication effect of the system.the gain of the photoelectric detection circuit can realize adaptive change,and the output signal amplitude is basically stable at 2 V.the reception probability of the system for the signal is increased from 73.3% to 99.5%,and the decoding probability is increased from 54.5% to 95.8%,which greatly The system sensitivity S is-15.4 d Bm and the BER is 0.9%.The performance indexes of the photoelectric detection system all meet the design requirements,which verifies the scientificity and feasibility of the photoelectric detection system design in this paper.