角加速度测量

首先简单介绍了角加速度测量方法,并对国内外几种角加速度传感器进行了分析,介绍了它们的设计思想、工作原理、特性及其应用,最后对国内角加速度传感器研究状况进行了简单的探讨.     

基于轴角编码器二阶跟踪微分的角加速度测量

角加速度是描述旋转机构工作状态的一项重要参数。常用压力或压电传感器测量角加速度的方法存在易受待测设备自身振动干扰的问题。本文基于高精度绝对式光电轴角编码器,提出采用二阶跟踪微分处理的方法,以准确测量发射车起竖臂工作过程中的角加速度。     

Angular Spectra in Radar Applications

Recent advances in the art of estimating spectral densities have led to speculation that these same techniques could be used to improve angular resolution in radar applications. An improvement in angular resulution would be particularly helpful in sepingrating low angle returns from their surface reflected images. Despite the duality between time and space, however, it turns out that the low angle radar problem is different from the usual spectral estimation problem in a rather fundamental way. The unfortunate result is that the improved spectral estimation techniques are of little, if any, value in solving the low angle tracking problems.     

低频标准角振动台

低频标准角振动台产生标准角位移、角速度和角加速度,用正弦信号对角位移传感器、角速度传感器(陀螺、转速表等)和角加速度计进行幅频和相频特性校准。简要介绍了低频标准角振动台的工作原理,并应用其对角运动传感器进行校准。校准范围为0.1~100H z;幅值灵敏度不确定度优于1%;相移不确定度小于1°。     

角速率轰炸原理应用研究

介绍了角速率轰炸原理及其在某型飞机上的应用。并建立角速率轰炸的工作式，同时进行了火控轰炸的精度分析和仿真计算，为轰炸机装备角速率轰炸系统提供了依据。     

捷联激光制导的视线信号提取方法

提出了一种弹目视线角信号的提取方法,该方法采用UKF解耦,针对捷联激光制导炸弹需要攻击移动目标却不能测量弹目相对距离和速度的情况,建立了弹目相对运动模型,解耦过程不需要相对距离信息,能够更方便地应用于工程实践.经仿真验证,此方法可以较好地估计出弹目视线角以及角速率信息,能够满足捷联激光制导炸弹工程应用的需要.     

感应同步器测角电路中的锁相环

本文分析了在双相激磁单相输出的鉴相型感应同步器测角系统中激磁信号的锁相环电路.重点分析了压控移相器的性能.     

机载光纤角位移传感器

介绍了一种新型光纤角位移传感器的基本工作原理,对研制的样机进行了性能测试,试验数据验证了传感器的设计方案是可行的.初步探讨了影响传感器性能的多种因素.     

Exact Target Angular Coordinates from Biased Radar Measurements

Exact and simplified expressions are derived for the calibration of raw target coordinate measurements obtained from a tracking radar, The measured target position in angle is indicated by the displacement of the antenna boresight. The true target position, however, deviates from this measured value because of such system biases as tilt (leveling error), nonorthogonality of axes, collimation error, dynamic lag, etc. These and other biases are accounted for in this paper. The pedestal configuration assumed is an elevation over azimuth mount. A noise-free environment is also assumed.     

Angular Tracking of Two Closely Spaced Radar Targets

Bounds on the accuracy of unbiased estimates of the angular coordinates of a target, in the presence of a nearby interfering target, have previously been determined. These bounds allow for the angular resolution of two CW targets to an extent limited only by the signal-to-noise ratio (SNR). An SNR of 40 dB will allow two targets to be resolved at less than one-fifth beamwidth (?/2 X) separation, for most values of target relative phase angles. The maximum-likelihood estimator for this problem, based on the outputs of a plane circular array of receiving elements, is found and simplified. An analog realization of the two-target maximum-likeli-hood processor is presented. This realization has the simple form of two single-target trackers each tracking one of the targets, linked by a decoupling network which accounts for the interference produced in each by the presence of a second target, when the targets are separated by less than a beamwidth. Results of an analog-computer simulation of the system are given and discussed. Finally an application to the finite-size single-target problem is given.     

Nonlinear Optimal Feedback Regulation of Satellite Angular Monenta

Some important regulation properties of satellite angular momentum dynamics are investigated using a combination of reaction jets and flywheels. The optimal feedback controller is designed in such a way that system regulation, under large perturbations, to a proper bounded subset in Rn, is achieved by using reaction jets. Thereafter, flywheels are activated to bring the system to the rest (desired) state. The domain and the size over which reaction jets are active, as well as the corresponding fuel cost, are discussed. Further, the effect of linear as well as nonlinear optimal feedback regulators on system behavior is indicated. Finally, the range (in the state space Rn) over which the flywheels are capable of regulating the system is also studied.     

挠性陀螺接头角刚度测量

介绍了一种挠性陀螺接头自动测量系统,该系统测量方便、迅速、测量重复精度优于±１％     

飞机俯仰速率信号重构方法研究

研究了六自由度非线性方程描述的飞机在俯仰速率传感器故障情况下的信号重构方法。给出了两种重构方法，一种是通过建立等效的线性模型，设计线性状态观测器重构状态信号，另一种是使用非线性跟踪微分器方法．通过跟踪俯仰角的微分信号来计算俯仰速率信号。仿真结果表明，两种方法都具有一定的可行性。     

被动雷达导引头两点源角分辨技术

被动雷达导引头难以分辨落在同一波束内的多个辐射源。本文通过导引头输出的信号,联立方程求解得到两源方位角和俯仰角的解析解,实现了对两点源的角分辨。数值仿真验证了该算法的有效性。     

速率转台低角速率校准方法探讨

主要描述速率转台低角速率的一种校准方法,并对该方法进行分析探讨.     

Angular Accuracy of the Binary Moving Window Radar Detector

The angular accuracy of a search radar depends on the extraction technique. For the case of a binary moving window extractor, the accuracy is evaluated in different operational conditions including target scintillation. A beam-splitting technique that was devised to improve the accuracy is also evaluated and compared with the binary moving window.     

Exact Angular Accuracy of an Amplitude Comparison Sequential-Lobing Processor

Assume E1 and E2 are the squares of two sequential envelopes from the sequential lobing of an antenna in a given plane. Independent thermal noise is generally present in the envelopes. The statistic e = (E2 ? E1)/(E2 + E1) has been used as an estimate of the angle to a target for the significant region of small angles compared to a beamwidth. For a nonfading target, the probability density and characteristic function of e are obtained in closed form. Thence, the exact bias, standard deviation, and rms error in estimating the noise-free value e of e are obtained for all e and signal-to-noise ratios. The same type of statistic as e can be used to estimate time delay in a split range gate tracker.     

Angular mean and variance for selected two-source radar-target combinations

Angle tracking of the desired target in the presence of interference is a common radar problem. It can occur when the desired target is competing with a jammer, clutter, or multipath. Angle statistics can vary significantly for a tracking radar depending upon the nature of this interference. The angular mean and variance are presented for three different statistical two-target types for single and multiple measurements. Previously derived values are presented for completeness in conjunction with derivations not found in the open literature. The signal-to-noise ratio is assumed to be large so that the effects of receiver noise may be neglected.