| This thesis present the systematic studies on firing accuracy and firing accuracy tactical & technical requirement reasoning for gunnery system .The main contents of the paper are as follows.(1) Definitions and probability distribution expressions for error of fire, error of firing data and error of dispersion are given summarily. Methods to compose error of initial firing data and error of dispersion are discussed. Different ways to figure the precision of fire are analyzed. Methods to estimate bias error, dispersion and first round hit probability for artillery system are shown.(2) Error-sources of position survey preparation, target position decision, ballistic preparation, meteorology preparation, models, technical preparation and the rest for deliberate preparation as well as their effects on initial firing data errors are discussed in details. The origins of dispersion error are analyzed; effects of initial velocity dispersion, ballistic coefficient dispersion, drift coefficient dispersion, range wind &cross wind dispersion on the ballistic dispersion are discussed. A conclusion of dispersions along with firing range and the relation between bias error and dispersion are analyzed.(3) Deviation of the air pressure calculated through temperature and practical measured is studied. Based on calculating results, the effect of air pressure deviation on accuracy of fire is discussed. Relation between virtual temperature correction and humidity, influence of humidity on accuracy firing data, and problem of using identical relative humidity to substituted real humidity distribution are analyzed. Firing error caused by using the NATO meteorological layer-weight, by using the approximate meteorological layer-weight and by using the exact meteorological layer-weight under different initial velocity and different ballistic coefficient is analyzed. Firing error caused by air-layer numbers of trajectory are set forth. Firing errors caused by six samples of representative of meteorological element in each air layer is compared. A suggestion of sampling meteorological elements representative in each air layer is put forward. A method to calculated influence of meteorological elements measurement errors on firing accuracy is discussed; the effect of meteorological measurement errors on firing accuracy is analyzed.(4) According to the influence of each factor upon firing set of data under condition of deliberate preparation, precision of firing data and proportions of each preparation errormaking up to the initial firing data errors along with firing ranges are studied. Meteorological condition changing with space-time and their effect on accuracy of firing data are analyzed. Methods to calculate effect of bias error and dispersion on first-round hitting probability and on multi-round hit probability are discussed. According to calculating results, influence on first-round hitting probability by accuracy of each factor, by the firing range, by the change of meteorology condition with space-time, and by dispersion are analyzed, so are influence on multi-round hitting probability by bias error & dispersion.(5) Based on the launch feature of cargo projectile, composition & transformation of the firing errors of cargo projectile are studied. Hitting probability model for the cargo projectile is established, and hitting probability expressions are given. Influences on the hitting probability by error of carrier, by dispersion of sub-projectiles, by size of target, by the numbers of sub-projectiles, and by the range of fire are analyzed. Monte-Carlo simulations to calculate the hitting probability are discussed; results comparison by Monte Carlo simulation and by integral are made.(6) Reasoning of influence on first round hit probability of frag-demolition projectile by accuracy, by density, and by size of target is made, so is reasoning of influence on first round hit probability of carrier projectile by dispersion of sub-projectiles. With an example, the tactical & technical requirement...
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