星孔药柱旋转发动机工作过程数值模拟

建立了星孔药柱发动机在旋转状态下工作过程仿真的物理模型和计算模型，给出了部分计算结果。通过数十发实验获得了燃速加速度敏感性的经验关系式，并且采用全尺寸发动机进行了实验验证。实验和理论预示压强时间曲线具有良好的一致性。     

转盘测距仪的工作原理及其误差分析

转盘测距仪的结构简单,安装操作方便,测量精度比较高,现已得到广泛应用。简要介绍转盘测距仪的工作原理,测量误差来源与分布以及减少测量误差的方法。     

Performance of a Two-Sample Mann-Whitney Nonparametric Detector in a Radar Application

The detection of signals in an unknown, typically non-Gaussian noise environment, while attempting to maintain a constant false-alarm rate, is a common problem in radar and sonar. The raw receiver data is commonly processed initially by a bank of frequency filters. The further processing of the outputs from the filter bank by a two-sample Mann-Whitney detector is considered. When the noise statistics in all filters are identical, the Mann-Whitney detector is distribution free, i. e., the false-alarm probability may be prescribed in advance regardless of the precise form of the noise statistics. The primary purpose of this paper is to demonstrate the potential advantage of nonparametric detectors over conventional detectors. The signal detection performance of the Mann-Whitney detector is compared to that of an ordinary linear envelope detector plus integrator in the presence of Gaussian and several hypothetical forms of non-Gaussian noise. This comparison is made for both uniform and nonuniform distributions of noise power across the filter bank. Besides providing a much more constant false-alarm rate than the conventional detector, the Mann-Whitney detector's signal detection performance is found also to be much less sensitive to the form of the noise statistics. In one case, its detection sensitivity is found to be 11 dB better than that of the conventional detector. Even when the noise power density is made moderately nonuniform across the filter bank, the detection performance of the Mann-Whitney detector is found not to be significantly affected.     

卫星AOCS的地面测试系统

本文介绍我国新一代返回式对地观测卫星姿态和轨道控制系统（ＡＯＣＳ）的地面测试系统──一种性能价格比较高的卫星控制系统地面测试设备。整个系统自动化程度较高，实时性强，操作方便，易于及时发现问题。该系统已圆满地完成了系统试验，整星综合测试及靶场测试。