基于单片机的室内空气质量检测仪的设计

simulink仿真。36电平。仿真精度可调。附带参考英文文献。

通过实例对人工神经网络的实际应用进行分析和讲解，清晰的代码一目了然每神经元有许多输入、输出键,各神经元之间以连接键(又称突触)相连,它决定神经元之间的连接强度(突触强度)和性质(兴奋或抑制),即决定神经元间相互作用的强弱和正负,共有三种类型:兴奋型连接、抑制型连接、无连接。这样,个神经元(一般很大)构成一个相互影响的复杂网终系统,通过调整网络参数,可使人工神经网络具有所需要的特定功能,即学习、训练或自组织过程。一个简单的人工神经网络结构图如下所示:上图中,左侧为输入层(输入层的神经元个数由输入的维度决定),右侧为输出层(输出层的神经元个数由输出的维度决定),输入层与输出层之间即为隐层。输入层节点上的神经元接收外部环境的输入模式,并由它传递给相连隐层上的各个神经元。隐层是神经元网络的内部处理层,这些神经元在网络内部构成中间层,不直接与外部输入、输出打交道。人工经网络所具有的模式变换能力主要体现在隐层的神经元上。输出层用于产生神经网络的输出模式。多层神经网络结构中有代表性的有前向网络(BP网络)模型Page 3 of 25多层侧抑制神经网络模型和带有反馈的多层神经网络模型等。本文主要探讨前向网络模型多层前向神经网络不具有侧扣制和反馈的连接方式,即不其有本层之间或指向前一层的连接弧,只有指向下一层的连接弧。代表是BP神经网终:输入模式由输入层进入网终,经中间各隐层的顺序变换,最后由输出层产生一个输出模式,如下图所示:输入层隐层输出层多层前向神经网终由隐层神经元的非线性处理衍生它的能力,这个任务的关键在于将神经元的加权输入非线性转换成一个输出的非线性激励函数。下图给出了一个接收个输入的神经元:Page 4 of 25神经元的输出由下式给出:这里输入的加权和(括号内部分)由一个非线性函数传递,表示与偏差输入相关的权值,表示与第个输入相关的权值。使用最广泛的函数是S形函数,其曲线家族包括对数函数和双曲正切函数,这些都可用来对人口动态系统、经济学系统等建模。另外所用的其他函数有高斯函数、正弦函数、反正切函数,在此不一一展开介绍,本文主要使用的激励函数是对数函数,函数表达式为函数曲线如下图所示对于有限输入量,对数函数输出范围为∈。在输入为=时,输出值为中问值输出在—附近随着输入的增加以相对快的Page 5 of 25速率增加并非常慢地到达上限。对于

【实例简介】一般情况下，成像系统获取的图像(即原始图像)由于受到种种条件限制和随机干扰，往往不能在视觉系统中直接使用，必须在视觉信息处理的早期阶段对原始图像进行灰度校正、噪声过滤等图像预处理．对机器视觉系统来说，所用的图像预处理方法并不考虑图像降质原因，只将图像中感兴趣的特征有选择地突出，衰减其不需要的特征，故预处理后的输出图像并不需要去逼近原图像．这类图像预处理方法统称为图像增强．图像增强技术主要有两种方法：空间域法和频率域法．空间域方法主要是在空间域内对图像像素直接运算处理．频率域方法就是在图像的某种变换域，对图像的变换值进行运算，如先对图像进行付立叶变换，再对图像的频谱进行某种计算(如滤波等)，最后将计算后的图像逆变换到空间域．

文档里有波束形成从入门到深入的matlab程序，还有仿真图，让您从纷乱复杂的程序中轻松明白其中的原理和计算过程。

基于Frenet优化轨迹的无人车动作规划实例，使用Python实现，高速场景

MATLAB初学者的练手之作，瑕疵较多，仅供参考

QPSK调制解调的Matlab仿真及性能分析，有利于学习Matlab仿真QPSK

本示例主要实现利用Excel操作Access数据库功能，包含以下功能：一、向数据库中新添数据；二、修改数据库中数据；三、删除数据库中数据；四、高级查询数据库中数据；(包含精确、模糊查询，可选择显示字段)五、批量操作数据库；六、采用在Excel表的导航栏中增加管理菜单的方式来实现操作功能；使用方法：1、Info.xls文件与Info.mdb文件在同一文件夹下；2、打开Info.xls文件后选择“启用宏”，如果没有该提示，请查看Excel->工具->宏->安全性  里的设置；3、正确启用宏之后，在Excel表的顶部菜单上会增加一个“信息管理菜单”的新菜单，具体操作在该菜单中实现； 本示例由黄云原创，仅供大家学习研究使用，在编写VBA时黄云尽量采用注释的方法来描述各部分作用，以期大家能够看懂。转载请保留宏中的注释信息。

自己修改过的IEEE802.15.4_opnet_simulation_model_v2.0，亲测在opnet 14.5中能够使用。

全新RTCM3.3协议完整版RTCM STANDARD 10403.3DIFFERENTIAL GNSS(GLOBAL NAVIGATION SATELLITE SYSTEMS)SERVICES – VERSION 3DEVELOPED BYRTCM SPECIAL COMMITTEE NO. 104OCTOBER 7, 2016COPYRIGHT©2016 RTCMRadio Technical Commission for Maritime Services1611 N. Kent St., Suite 605Arlington, Virginia 22209-214RTCM Paper 141-2016-SC104-STD000ocRTCMco00c30RTCM 10403. 3, Differential GNSS Global Navigation Satellite Systems)Services- Version 3, October 7, 2016This standard (referred to as version 3 has been developed by rtCm special Committee 104 as a moreefficient alternative to the standards entitled rtcm recommended standards for diffe rentialRecommended Standards for Differential gNss Global Navigation Satellite Systems Service, Version 2.x(Current version is 2. 3, now designated as RTCM 10402. 3. Service providers and vendors represented onthe SC104 Committee wanted a new standard that would be more efficient, easy to use, and more easilyadaptable to new situations. The main complaint was that the version 2. x parity scheme, which useswords with 24 bits of data followed by 6 bits of parity, was wasteful of bandwidth. Another complaint wasthat the parity was not independent from word to word. Still another was that even with so many bitsdevoted to parity the actual integrity of the message was not as high as it should be. Plus, 30-bit wordsare awkward to handle. the new standard version 3 is intended to correct these weaknessesUnlike Version 2. x, this standard does not include tentative messages The messages in Version 3 haveundergone testing for validity and interoperability and are considered to be permanent. amendments tothe standard may change the meaning of reserved bits or provide additional clarifying text, but no changeswill be made in the data fields. Changes will require new messages to be developed. In addition to themessages described in the current standard the committee continues to develop new messages whichare described in separately published amendments and periodically gathered into a new edition of thestandard. RTCM 10403x for dgNSS services is proving useful in supporting highly accurate differentialand kinematic positioning as well as a wide range of navigation applications worldwideNote that Version 3 messages are not compatible with Version 2. x. Since many receivers have beendesigned and programmed for use with Version 2. x messages, rtCm is maintaining both standards0402 3 and 10403, 3 as" standardsVersion 3.0The initial edition consisted primarily of messages designed to support real-time kinematic (RTK)operations. The reason for this emphasis is that rtk operation involves broadcasting a lot of informationand thus benefits the most from an efficient data format. Version 3.0 provided messages that supportGPS and gloNaSs rTK operations including code and carrier phase observables antenna parametersand ancillary system parametersVersion 3. 1(RTCM Standard 10403.1:The next edition, Version 3. 1 (RTCM Standard 10403. 1), incorporated GPS Network Corrections, whichenable a mobile receiver to obtain accurate rtk information valid over a large area. In addition, new GPSand GLoNaSS messages provide orbital parameters to assist in rapid acquisition a Unicode text messageis also provided for the transmission of textual data. Finally a set of messages are reserved for vendorswho want to encapsulate proprietary data in their broadcasts the gps Network Corrections enable amobile receiver to obtain accurate rtk information valid over a large area. the network rtk correctioninformation provided to a rover can be considered as interpolated corrections between the referencestations in the rtk network this interpolation is not perfect and varies with the actual conditions of theatmosphere. A residual interpolation error has to be expected. With sufficient redundancy in the RtKnetwork, the network server process can provide an estimate for residual interpolation errors. Suchquality estimates may be used by the rover to optimize the performance of rtk solutions The values maybe considered by the rover as a priori estimates only with sufficient tracking data available the rovermight be able to judge residual geometric and ionospheric errors itselfVersion 3. 1. Amendment 1:Amendments 1 was an extensive addition that adds rtcm messages containing transformation data andinformation about Coordinate reference Systems. For rtCm data supporting a rtk service, coordinatesare measured within the itrf or a regional realization surve yors and other users of rtk services mustnormally present their results in the coordinates of local datums. Therefore, coordinate transformationsare necessary. by having RTCM messages that contain transformation data and information about theCoordinate reference systems the users of the rtk service can obtain their results in the desired datumwithout any manual operations. the rtk service providers can then ensure that current information forthe computation of the transformations is always used. the convenience of this method will promote theacceptance of rtK servicesVersion 3. 1. amendment 2:Amendment 2 added residual error messages to support the use of Non-Physical or Computed referenceStations in a network rtk environmentVersion 3. 1. amendment 3:Amendment 3 addressed differences in the way gnss receiver manufacturers have implemented carrierphase encoding of some Version 3 messages so that carrier phase observations are in phase for all carrierphases of a specific frequency i e. they correct for quarter cycle phase shifts. others retain the quartercycle offset between the carrier phase observations in the data. this amendment documents the waydifferent manufacturers have handled the phase shift issue and prescribes a uniform approach for futureproducts.∨ersiⅰon3.1, Amendment4:Amendment 4 added sections 3.5.13 on glONASS Network rtK Correction Messages and 3.5. 14 on FKPNetwork Rtk Correction Messages Related revisions were also made elsewhere in the document.Version 3. 1. amendment 5Amendment 5 added section 3. 5. 12 on State Space Representation related revisions are also madeelsewhere in the document, along with some editorial correctionsVersion 3. 2(RTCM Standard 10403.2)Version 3.2 consolidates Version 3. 1 and all five amendments into a new edition, and it adds MultipleSignal Messages (MSM)as well. the Multiple Signal Message (MSm)format generates receiverobservables in the same way for all included satellite systems. the messages include compact and fullmessages for Pseudorange, PhaseRange, Carrier to Noise Ratio (standard and high resolution), andPhaseRangeratea table near the beginning of the standard lists which messages were included in each separate editionand amendment, so it should not be necessary for users to refer to older versions. Multiple signalMessages are a generic format that will be followed for all GNSs systems. version 3 originally consisted ofmessages for GPS and GLONASS, each in their own format Now with the imminent addition of signals forBeiDou, Galileo, and QZSS, as well as new signals provided by modernized GPS and GloNASS satellitesthe need for a consistent generic format became evident. service providers and users are urged to migrateto the MsM messages to make it easier to accommodate new gNss services(See The RTCM Multiple Signal Messages: A New Step in GNSS Data Standardization")Another newmessage is the gloNaSS Bias Information message. This message provides information which is intendedto compensate for the first-order inter-frequency phase range biases introduced by the reference receivercode- phase biasVersion 3.2, Amendment 1:Added Galileo F/NAv Satellite Ephemeris Data(msg. 1045 )and Bds MSM(msgs. 1121-1127)Version 3.2 amendment 2Added qzss ephemeris(msg. 1044 )and QZss MSm (msgs. 1111-1117Version 3. 3(RTCM Standard 10403.3)This new edition adds Satellite-Based Augmentation System Multiple Signal Messages to previouslydopted messages for GPS, GLONASS, Galileo, and QzssA new ephemeris message has been added for BeiDou(BDS)and a new I/NAV ephemeris message hasbeen added for Galileo. The new edition also reserves 100 messages be used exclusively by sc104 fornew message developmentFinally, the new edition makes consolidates previous amendments and makes numerous editorialImprovementsNavstar GPS Service, Version 2. x. Service providers and vendors represented on the scco000c30z1O2co00c30Contentsco00c30