CAMAC在卫星自动检测系统中的应用

本文叙述了CAMAC 在卫星自动检测系统中应用的目前状况;并且叙述了两个应用例子:第一个是CAMAC 整星测试系统;第二个是CAMAC 的卫星姿态控制和程序控制测试系统;最后讨论了应用CAMAC 的优点。     

Automatic landing system using neural networks and radio-technical subsystems

The paper focuses on the design of a new automatic landing system(ALS) in longitudinal plane; the new ALS controls the aircraft trajectory and longitudinal velocity. Aircraft control is achieved by means of a proportional-integral(PI) controller and the instrumental landing system– the first phase of landing(the glide slope) and a proportional-integral-derivative(PID) controller together with a radio-altimeter – the second phase of landing(the flare); both controllers modify the reference model associated with aircraft pitch angle. The control of the pitch angle and longitudinal velocity is performed by a neural network adaptive control system, based on the dynamic inversion concept, having the following as components: a linear dynamic compensator, a linear observer, reference models, and a Pseudo control hedging(PCH) block. The theoretical results are software implemented and validated by complex numerical simulations; compared with other ALSs having the same radio-technical subsystems but with conventional or fuzzy controllers for the control of aircraft pitch angle and longitudinal velocity, the architecture designed in this paper is characterized by much smaller overshoots and stationary errors.     

影响超精密车床加工精度的因素及其对策

结合ＨＣＭ－Ｉ型超精密车床的实际ｑ详细分析了影响超精密车床精度的几种主要因素，并提出了在数控系统中进行实时补偿的方法     

Analysis and experiments for delay compensation in attitude control of flexible spacecraft

Space vehicles are often characterized by highly flexible appendages, with low natural frequencies which can generate coupling phenomena during orbital maneuvering. The stability and delay margins of the controlled system are deeply affected by the presence of bodies with different elastic properties, assembled to form a complex multibody system. As a consequence, unstable behavior can arise. In this paper the problem is first faced from a numerical point of view, developing accurate multibody mathematical models, as well as relevant navigation and control algorithms. One of the main causes of instability is identified with the unavoidable presence of time delays in the GNC loop. A strategy to compensate for these delays is elaborated and tested using the simulation tool, and finally validated by means of a free floating platform, replicating the flexible spacecraft attitude dynamics (single axis rotation). The platform is equipped with thrusters commanded according to the on–off modulation of the Linear Quadratic Regulator (LQR) control law. The LQR is based on the estimate of the full state vector, i.e. including both rigid – attitude – and elastic variables, that is possible thanks to the on line measurement of the flexible displacements, realized by processing the images acquired by a dedicated camera. The accurate mathematical model of the system and the rigid and elastic measurements enable a prediction of the state, so that the control is evaluated taking the predicted state relevant to a delayed time into account. Both the simulations and the experimental campaign demonstrate that by compensating in this way the time delay, the instability is eliminated, and the maneuver is performed accurately.     

非电量自动测试系统

精密机电产品中的非电量是通过不同种类的传感器转换为电信号的c利用数字多用表自身的编程语言接口技术，,开发数码转换器设置代码程序技术；驱动打印机接口电路程序技术，实现了自动测量打印记录数据c代替笨重的旧设备及复杂的计算机系统既节省仪器购置经费，又减轻了操作人员的劳动强度，不仅满足了精密机电产品在科研生产中对非电量测试记录的需要，也提高了测显速度和产品质量。有大力推厂的前景。     

An automatic quality factor for Autoscala foF2 values

We propose a new parameter for quality evaluation of ionogram traces reconstructed by Autoscala. This parameter efficiently assesses the reliability of the automatic interpretation of ionospheric characteristics. Based on an extensive analysis of the data, the parameter values are statistically associated with the accuracy of f_oF2 data automatically scaled by Autoscala. Therefore, Autoscala will be improved by providing f_oF2 accuracy as supplementary output information.     

自动测试技术在备件研制中的应用

主要阐述了自动测斌技术住数字电路板备件研制方面的应用。通过对某型引俄设备数字电路板研制的验证事例，探索了ATE和LASAR仿真软件用于备件电路板研制与测试验证的方法。结合装备实验，证明了将仿真技术作为高效的电路设计验证手段，并将ATE作为通用测试验证平台的可行性和先进性。     

基于误差反馈补偿的攻击无人机角度和时间控制

在攻击无人机群协同攻击中,为了提高机群的整体突防能力,达到最佳的攻击和作战效能,有必要同时控制无人机的攻击角度和攻击时间。首先利用最优控制理论,在对飞行运动学模型进行线性化的前提下,通过加速度微分来实现对角度和时间的同时控制。但是,当终端入射角较大时,由于线性化假设不再成立,使得控制精度比较差。针对这一问题,利用具有高反馈效率的非线性误差反馈,把由于线性化引起的误差通过补偿反馈到系统回路中去,从而大幅度提高了控制精度。数值仿真结果验证了方法的有效性。     

基于神经网络的激光陀螺误差测试与建模

用人工神经网络中的反向误差传播网络(BP网络)来建立温度补偿模型,通过训练后的BP网络对刻度因子误差以及随机漂移进行温度补偿。     

陀螺静态漂移系数的两种估计方法

在分析了目前使用的AR（1）估计方法之不足后，提出了均值估计方法，以及这两种方法的改进型，即加权均值估计法和AR（p)法，计算结果表明，均值估计可以提高精度近40％，在导弹发射前的陀螺误差补偿中使用这一方法效果会更好。