摘要
为研究隔离度寄生回路对捷联图像导引头的影响,建立了捷联导引头隔离度寄生回路模型。通过无量纲化后得到无量纲特征方程,利用劳斯判据研究了制导参数、陀螺和探测器的刻度尺偏差和动力学偏差对稳定域的影响,并分析寄生回路对制导动力学的影响,建立非线性仿真模型;利用蒙特卡洛法研究脱靶量随刻度尺偏差和动力学偏差的变化规律,建立了半实物开环仿真测试系统,对隔离度寄生回路品质进行了评价。研究结果表明:角速率陀螺与探测器之间的刻度尺误差和动力学不匹配是引起隔离寄生回路的主要因素,其差值的正负分别代表隔离度寄生回路反馈的正负特性;正反馈的稳定域要远小于负反馈的稳定域,并且脱靶量对制导系统偏差的敏感度更大;为了提高系统阻尼,提高导弹末制导精度,需采用五轴转台半实物仿真测试系统对隔离度寄生回路的阻尼特性进行测试标定,或者消除刻度尺误差,完成动力学匹配,进而消除寄生回路的影响,或者构造负反馈寄生回路以减弱其影响。
In order to analyze the effect of disturbance rejection rate parasitic loop on strapdown imaging seeker, a model of disturbance rejection rate parasitic loop of strap-down seeker is established. Nondi- mensionalized method is used to obtain dimensionless characteristic equation, the effects of the guidance parameter and the scale factors and dynamic errors of gyro and seeker on the stability region of parasitical loop as well as the effect of parasitic loop on the dynamics of guidance system are studied by using Routh criteria, and the nonlinear models are established. Monte Carlo method is used to study the change of miss distance with scale factor and dynamics errors. A semi-physical open loop test system is established to appraise the quality of disturbance rejection rate parasitic loop. The research result shows that the scale error and the mismatch between the rate gyro and the detector are the main factors that cause the DRE parasitic loop. The numerical value of the error and mismatch decides whether the parasitic loop is posi- tive or negative feedback. The stable domain of positive feedback is far less than that of negative feed- back, while the miss distance is more sensitive to guidance system deviation. To improve the guidance precision, five axis turntable semi-p ing characteristics of parasitic loop, scale error and the mismatch, or at hysical simulation test system was used to test and calibrate the damp- by which the parasitic effect can be eliminated by eliminating the least be reduced by constructing a negative feedback parasitic loop.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2017年第3期494-500,共7页
Acta Armamentarii
基金
航空科学基金项目(20150172001)
关键词
兵器科学与技术
捷联导引头
寄生回路
刻度尺偏差
动力学偏差
半实物测试
ordnance science and technology
strapdown seeker
parasitic loop
scale factor error
dy-namics error
semi-physical test
