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开源地图下载器
开源地图下载器，是由 openlayers 中文官方站开发的，本程序为开源免费版，没有下载限制，只能下载 google 行政图，卫星图，和地形图。其他地图可以自行扩展
- 2020-11-03下载
- 积分：1
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log gabor 滤波器matlab程序
log gabor 滤波器matlab程序 log gabor 滤波器matlab程序
- 2020-12-10下载
- 积分：1
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stm32f407ADC高速采样并进行CFFT变换
这个程序是一个stm32F407的3个ADC进行交替转换，ADC采样率达到最大8.4Msps，连续采样，采样之后采用cortex-M4内部的dsp和fpu单元进行快速的复杂傅里叶变换，通过串口打印输入信号的波形和cfft运算后的结果
- 2020-12-06下载
- 积分：1
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PSO算法的最大熵阈值图像分割
图像分割是目标识别的首要和关键步骤。目前的图像分割方法有多种, 其中阈值方法优点比较突出, 但是采用阈值方法分割的关键是要能高效率地找到被分图像的最佳熵阈值。针对这一问题, 将Geese- LDW- PSO 算法的位置更新公式作了改进, 即用当前种群的全局极值取代所有粒子的当前位置, 并将之用于熵阈值图像分割中。仿真实验表明, 该算法可以快速稳定地获得一幅图像的最佳分割阈值。仿真结果显示, 该方法对车牌分割具有较好的性能。专业论文，为广大做毕设同学提供资源
- 2020-11-30下载
- 积分：1
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中科大刘明侯老师fluent讲义.pdf
【实例简介】中科大刘明侯老师fluent讲义.pdf
传说中的经典fluent教材，绝版很多网站下不到的。
- 2021-11-15 00:32:07下载
- 积分：1
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at指令发送和解析模块代码
适用于发送和接收字符串都确定的模块，AT模块通用初始化模板。功能：发送完，自动检查回复指令内容，支持超时重发，模块重启等操作，以RM08模块为历程，可移植到类似的模块。
- 2021-05-07下载
- 积分：1
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RTCM3.3协议全
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
- 2020-06-27下载
- 积分：1
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tcnative-1.dll 32位 and tcnative-1.dll 64位
tcnative-1.dll 32位 and tcnative-1.dll 64位tcnative-1.dll 32位 and tcnative-1.dll 64位
- 2020-12-07下载
- 积分：1
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LTspice_MOS Tool.rar
VDmostool软件是一款LTspice中MOS建模软件。它可以从MOS数据手册创建板级mosfet模型，该模型只能在LTspice中使用。 这是因为它利用了称为VDMOS的新mosfet模型，并且仅在LTspice中可用。 该设备替代了子电路模型，子电路模型通常不起作用，即使可以工作，也会因模拟运行太慢而无法完全使用。 LTspice中的VDmos模型不是子电路，而是使用模型语句的新的内置设备模型。 进行了一些改进，从而使模拟运行更快。
- 2021-05-06下载
- 积分：1
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RK3229 MIC
RK3229 的多mic阵列麦方案，RK原厂提供，对于做多MIC客户用途比较大RaCkChpP瑞芯微电子福州瑞芯微电子股份有限公司目录目录3概述■1■■1■■1■1■■1■■1■1面■■■■■■4产品版本4适用对象41-概述,:■:■":■::■::::::::::::.::.::.::.::.::::":::::::::::::::::::1.1麦克风阵列EK廾发平台简介1.2麦克风阵列EVK框图.13麦克风阵列E∨K组件2麦克风阵列E硎K介绍..………82.1整体效果图82.2结构与接口示意图3麦克风阵列子板模块简述n113.16+0+2麦克风阵列方案说明113.2内、外圈园周阵列麦■重着国面重着国面重着国面日重面重面重面自重面自■重■,面■重■面■重■,面重■,面■113.3 Codec.3.4PA133.5 Loopback回采电路,,,,,,,,,133.6排针∴144注意事项∴.….154.1注意事项15Copyright 2015 @Fuzhou Rockchip Electronics Co., LtdRaCkChpP瑞芯微电子福州瑞芯微电子股份有限公司前言概述本文档主要介纽RK麦克风阵列EVK基本功能特点和硬件特性、硬件配置以及使用方法,旨在帮助相关开发人员更快、更准确地使用该EVK,进行麦克风阵列冫案的应用开发E∨K由RK3229主板与麦克风阵列子板共两部分组成,本文档着重介绍麦克风阵列相关内容,即麦克风阵列」板及其与RK3229主板相关联部分。涉及RK3229主板的其他功能,可参考《RK3229BOX开发板用户使用指南》以获取更详细信息。产品版本本文档对应的产品版本如下:品名称版本描述RK SDK BOX RK3229 Discrete PowerV1.0RK3229主板DDR3P416DD6V1020160120LⅩFRK BOX EVB MICARRAYTESTBOARDV1.06+0+2麦克风阵列子板RK3229V1020160901适用对象本文档主要适用于以下人员:技术支持工程师单板硬件开发工程师频算法工程师嵌入式软件开发工稈师测试工程师Copyright 2015 @Fuzhou Rockchip Electronics Co., LtdRaCkChpP瑞芯微电子福州瑞芯微电子股份有限公司缩略语缩略语指文档中常用的词组简称:内部整合电路(两线式串行通讯总I2CInter-Integrated Circuit线)I2SInter-IC Sound集成电路内置音频总线PAPowerAmplifier此处特指音频功率放大器RKRockchip lectronics Co. Ltd瑞芯微电子有限公司Copyright 2015 @Fuzhou Rockchip Electronics Co., LtdRaCkChpP瑞芯微电子福州瑞芯微电子股份有限公司1概述1.1麦克风阵列EVK开发平台简介RK3229芯片是一款包括NeOn和FPU协处理器在内的四核 ARM Cortex-A7处理器,主频1.5GHz;集成∫32 bits ddr3/DDR3L/ LPDDR2/ LPDDR3控制器,提供了高性能、髙分辨率应用程序所需要的内存带宽。芯片能胜任高分辨率(4K/60Hz)显示、多通道(8+2)音频处理和主流应用。芯片内置3路I2S接口,I2S1用于HDMI输出的音频处理,另外2路I2S0与I2S2可供用户自由分配。其中,I2S2支持同吋2通道输入与2通道输出,I2S0则可最扃支持至8通道输入或8通道输出。麦克风阵列E∨K是基于6+0+2名麦克风方案(6+0+2介绍见3.1章节)的硬件参考设计,同时RK3229主板将芯片资源都作了引出,方便客户验证、调试与二次开发,只需要简单修改参考设计的模块电路,就可以完成产品的硬件设计12麦克风阵列EvK框图RK3229主板使用12∨/2A适配器供电,通过UART串口进行调试,验证各功能模块。开发板配有HDMI输出, SPDIF输出,ⅥWIFI+BT模组, Etherne接口,USB接口,TF卡,红外接收以IR,CVBS视频接口等,非常有利于芯片方案的深入研发与快速产品化。主板与麦克风阵列子板通过10x2的2.54mm排线连接,音频接口包括5V电溟、1组I2S1信号、1组I2C信号与2个通用GPIO。详细资源使用情况见下图:Copyright 2015 @Fuzhou Rockchip Electronics Co., LtdRaCkChpP瑞芯微电子福州瑞芯微电子股份有限公司口RockchipRK3229Serug OARI2wskur Reset nimrod4x二C/D2XLDOPowerUSB HUST2J图1RK3229主板系统框图工C3Vf∞rMICaD5V王CC⊥K工CM工c5图2麦克风阵列子板系统框图13麦克风阵列EvK组件麦克风阵列EWK主要包括以下物品:RK3229主板麦克风阵列子板电源适配器,规格:输入100VAC240VAC,50;输出12VDC,2A2.54m20针排线Copyright 2015 @Fuzhou Rockchip Electronics Co., LtdRaCkChpP瑞芯微电子福州瑞芯微电子股份有限公司2麦克风阵列EW介绍2.1整体效果图麦克风阵列EWK整体实物图如下ppDJoZl (l esnw最w箱x思图1麦克风阵列EVK实物图Copyright 2015 @Fuzhou Rockchip Electronics Co., LtdRaCkChpP瑞芯微电子福州瑞芯微电子股份有限公司g88888图2麦克风阵列子板实物图-正面、背面2.2结构与接口示意图麦克风阵列了板PB布局如图所示外园麦克风、6个直径Rcm闪园麦先风、6个直径5cmCodecPAT排针Codec(6PA2喇刺叭翰出2RK BOX EVB NICARRAY TESTBOARD RK3226_2018%ad图5麦克风阵列子板PCB正面图Copyright 2015 @Fuzhou Rockchip Electronics Co., LtdRaCkChpP瑞芯微电子福州瑞芯微电子股份有限公司各模块及接∏说明如卜表表1麦克风阵列子板说明编号说明措述1选项1-外圈麦克风直径80mm6个数字麦克风2选项2-内圈麦克风直径50mm6个数字麦克风选3odec每个 Codec支持2路输出与2路输入PAD类音频功放芯片456喇叭输出2个喇叭输出排针与RK3229主板连接的排针Copyright 2015 @Fuzhou Rockchip Electronics Co., Ltd10
- 2020-12-07下载
- 积分：1
