关于通信的英文文献

空间遥感方法对压场 方向性估计。 一，导言 为外地的方向性品种的估计技术 研究文献[1] - [5]。因此，理论分析 之间的水听器阵列输出的关系 噪声场中[1]进行 - [5]。发达国家技术 是基于阵列波束输出或crossspectral 数组元素之间的产出[4] - [5矩阵]。那个 问题是在海洋领域的方向性估计使用， 水平线拖曳阵还讨论了文献[5] - [8]。最近，到达方向和领域的方向性问题 提出传感器阵列估计吸引了 新的兴趣[9] - [12]。结果表明，数组的议案 数组可以提高性能假设时间相干性 连续样本[10] - [11]。在[12]，波场 抽样方法，利用了线性关系 现场的噪音和多波束形成产出集合 各阵列方向提出。结果表明： 波场抽样（是）方法优于其他测试 方法。该算法通过实施递归 估算方法及其收敛性的独特的解决方案 是许诺的方针和一系列具体规定 波束研究方向。然而，一个正确的方法 阵列波束的方向和研究方向序列 选择仍然是一个悬而未决的问题。 该油田的方向性估计质量是决定 的角分辨率。较高的角分辨率 是，在远场的来源更准确的估计， 和更好的检测性能可以实现的。其中 在阵列信号处理的基本关系是： 的角分辨率是成正比的数目 数组的元素[13]。这种关系的愿望激励 更长的阵列，可以实现更高的分辨率。不幸地， 违反规定的实施和 安装限制，激励短阵列。而且， 较长的数组执行机动平台 如无人（无人潜航器），水下机器人，甚至可以 不可能的[14]。这些矛盾的追求激励 替代阵列信号处理方法。 通常，外地方向性被建模为有限集合 强远场窄带源和各向同性低功率 噪音[1]。在这项工作中，该字段的方向性模型 采用以下方式。首先，轴承角 空间均匀取样到大量的离散 角度。其次，假定醚的高能量 对应于远场强来源或低能量 对应于各向同性噪声的传感器接收 阵列从这些离散方位角每个。

Features • CSA/NRTL Approved • Used for non-intrusive configuration and calibration of SEC 2000 gas detectors• Calibrates, checks and correlates data from any SEC detector on the data highway• Bi-directional infrared communication when pointed at any SEC 2000 display board• Intrinsically safe menu driven device • Can communicate with SEC 1500, SEC 2000 and SEC DAIM devicesOperationThe SEC 2500 Hand Held Programmer transmits and receives infrared light from the front of the The infrared light is used to establish non-intrusive communication with any SEC 2000 that is equipped with a display When communicating with the SEC 2000, the SEC 2500 must be pointed directly at the display module of the SEC 2000 which can be up to 15 feet The Hand Held Programmer can communicate with any SEC 2000 gas detector on the same RS-485 network once infrared communication is Data exchange, using the infrared link, occurs at a rate of 300 The programmer has a socket at the bottom of the unit for connecting to a Data Communication Cable (P/N 147-1000C) The Data Communication Cable enables a hardwire communication connection to all SEC Once communication is established, the devices can be checked, calibrated and information can be correlated with a touch of the keypad located on the SEC 2500 Hand Held P The SEC 2500 Hand Held Programmer is certified for use in hazardous The SEC 4100 System Monitor is a multi-channel microprocessor based controller designed to monitor the gas and fire detection Each SEC 4100 System Monitor provides a digital display of each device and alarm level present at each Initiates alarms when any device senses a dangerous The SEC 4100 System Monitor has 2 sets of “Data A” and “Data B” terminals, labeled LAN X and LAN Y This allows the detectors to be connected in a compete The SEC 4100 will transfer communication between the LAN X and LAN Y highway when a communication fault is The SEC 4100 System Monitor can be used with SEC DAIM Modules to add other types of devices to the See SEC 4853 DAIM data sheet for further The SEC 4100 System Monitor can also be used in conjunction with the SEC 4850 Repeater, SEC 4851 Expansion Relay Controller, SEC 4852 High Density Display and SEC Supervision Plus software Other Products Available:Infrared Hydrocarbon Gas DetectorsExplosion Proof Gas DetectorsNon-Explosion Proof Gas Detectors4-20 mA Gas DetectorsData Logging/Graphics Software PackagesOptical UV/IR Flame DetectorsFire Suppression Aerosol GeneratorsPortable Automatic Fire Fighting SystemsHalotron SystemsTwin Agent UnitsDry Chemical Mobile and Stationary Units