Artillery plays a major role in fire assault of land force . how to improve fire reaction speed and hitting accuracy on the condition available has been the main researching subject of towed artillery for a long time 炮兵是陆军火力突击的骨干力量，如何在现有装备条件下提高火力反应速度和命中精度是长期以来牵引炮兵研究的主要课题。
In recent years , they paid more attention to the research , development and production of smokescreen equipment . the battles have proved that when attacking weapon ’ s efficiency reduced by 4 / 5 , while defending it could let the enemy ’ s weapon efficiency reduced by 9 / 10 战争证明进攻时烟雾能使敌方武器效能降低4 / 5 ,防御时能使敌方武器效能降低9 / 10 ,还有资料介绍,激光制导反坦克导弹在烟雾干扰下探测效能下降80 % ,命中精度下降60 % 。
It can bring errors on the impact point . sometimes the errors can reach hundreds of meters or even more . so in order to insure the precision of the missile , the disturbing gravitation is must be take into account when we calculating the ballistic trajectories 作用在远程导弹弹道上的扰动引力对导弹落点偏差的影响是不可忽略，它对导弹落点偏差的影响可达数百甚至千米数量级，所以要保证导弹的命中精度就必须在弹道计算中考虑扰动引力的影响。
In the end of this thesis , on the basis of the mathematical model , three segments of trajectory : the vertical turn , the pn guidance and the direct lateral force control in terminal trajectory are simulated . the results show that with the direct lateral force control reduces in terminal trajectory , the miss - distance is reduced and the precision is improved 4 、论文最后根据前面建立的数学模型，对防空导弹垂直转弯段、比例导引段以及末端直接力控制段进行了仿真计算，结果表明进行末端直接侧向力控制可以有效减小拦截目标时的脱靶量，提高命中精度。
The cruise missile has the strong ability of the breakthrough defense , the high accuracy of hitting the target , the flexible agiligy , the easy implementaition in the technique and the low price in building etc . , so it is welcome extensively by each country in the world , and has developed to become the important weapon in the modern war , and is one of the main combat targets after 90 ' s of last century 摘要巡航导弹具有突防能力强、命中精度高、灵活性强、技术上易于实现和造价低等优点而备受各个国家重视，已经发展成为现代战争的重要武器，是上世纪90年代以后的主要空中作战目标之一。
The test of " xx " underwater to surface missile aiming precision was tested on the sea . under the circumstance there was no reference information about domestic and overseas , the test of the underwater to surface missile aiming precision for the first time was finished on the mobile bedding launching , and filled up field of aiming spacing in our country . the test indicated that total precision of missile aiming system and analysis error of drop into target provided the foundation 基于外测岸标的“ xx ”潜地导弹海上瞄准精度鉴定试验，它是在无国内外参基于外测岸标的潜地导弹瞄准精度鉴定方法研究外参考资料可借鉴的情况下，我国首次在动基座上进行潜地导弹瞄准精度鉴定试验，填补了我国在这一领域的试验方法及试验技术的空白，取得的试验结果，对于分析导弹落点误差及估算导弹组合命中精度提供了依据。
