Key Techniques Research On Laser Guidance Information Fields Simulation

The key techniques related to the Laser Guidance Information Fields (LGIF) simulation tests are studied in this dissertation. The main contents and contributions are as follows:Firstly, the key techniques and the present status of Laser Guided Weapons (LGW) and its countermeasure equipments are presented. The tactical models in battlefields the Laser Target Designators (LTD) signals and the key techniques for LGIF during the Hardware-In-Loop (HWIL) simulation tests are analyzed. The main factors that influence the results of LGIF are discussed, and the methods to construct the LGIF simulation tests based on Integrated Equality Measures system are provided.Secondly, the morphologies of battlefields aerosol particles and the main influent factors to the LGIF are analyzed according to the characters of the aerosols. The emphasis are on the theoretically research to the scattering characters of the spherical particles such as fog and water resolvable materials, and the nonspherical particles such as soot (black carbon, carbon black) aggregates and coated mixtures. In the calculation to soot aggregates, the Particle Number Distribution (PND) are suggested to take the place of conventional laboratory Particle Size Distribution (PSD) methods with a representation of Particle Number Per Aggregate(PNPA) for the the soot aggregates'scattering characters calculations. The research on theories of mixed Soot Aggregates, the morphologies, the scattering characters and the atmospheric radiative transfer are provided with the First-type mixed soot aggregates, the Second-type mixed soot aggregates and the coated nonspherical particles.Thirdly, the research on the multi-scattering theories in density medium for laser radiative transfer and their applications in the LGIF are presented. According to the simulation results of the distributed nonspherical particles'general scattering phase functions, the calculations in the applications of LGIF atmospheric transference, the effects of smokes'extinction, the phenomenon of pulse width enlargement, etc. are studied with the Small Angle Approach Method and Monte Carlo Method.Fourthly, based on the Laser Warning (LW) systems characters of small aperture, far-field, weak signal and high detection probability acceptance, the laser signal's scintillation caused by atmospheric turbulence is analyzed and the atmospheric scintillation influence to laser warning system's detection probability are also studied. According to the Double-Gamma atmospheric scintillation models of Doubly Stochastic Theory which can be used in the fields of mid to strong turbulence scales, the analysis to theories of signal detection and noises of the laser warning system's detectors are also provided. The turbulence generation, existence, and day-night distribution based on the data of fields'atmospheric refractive index structure constants measured by Fast-response Thermometers observation are studied. The calculation of the models related to field laser atmosphere transfer and its effects with detection probability of certain LW system are delivered.Fifthly, the analysis for the two-order dynamic response process of LTD and the aiming errors are introduced to the Air-borned LTD random position jitting simulation. The Gaussian white noises and the filtered colored noises are used to simulate the LTD's jitting energy statistical characters in the LGIF simulation test.Sixthly, based on analysis to the results of jamming phenomenon caused by extra laser energy in the LW systems'HWIL simulation tests, the extra laser energy test system is designed and constructed in the experimental test system. Based on the real data of the test system and the predicable scattering models, it is pointed out that the methods to control extra laser energy in the lab LGW Simulation and ways to reduce the side effects to simulation results are necessary for a precise result.At last, the key techniques related to Laser Extinct Chamber (LEC),the experiments of laser extinction materials, and the test methods to the materials according to the demands to LEC in HWIL simulation tests arrangement are delivered.The analysis to the models of laser extinction methods, the long-chain molecule absorption, surface diffuse reflection, and effects of continuous waveband extinction theories are given. The surface extinction coefficient in the main laser wavelengths can meet the design criterion respectively. The methods of integral spherical instrument double path cooperation in visible wavebands to near Infrared wavebands, together with the methods based on cold sky background with high emitting gold plate in long Infrared wavebands are put forward. The dissertation provides the results of the simulation theories and key techniques for the generation, transference, acceptance, and their models in the LGIF simulation tests. It can contribute to the simulation tests of LGW and countermeasure equipments.