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Android蓝牙串口传输心电数据画图的小程序
Andriod 2.2的蓝牙串口协议传输的一个小范例程序。可以查找蓝牙设备，建立连接，传输心电数据并画出波形图。如果要进行测试，请在有蓝牙适配器的电脑上安装支持虚拟蓝牙串口的驱动，如IVT WILDCOM等。用手机搜索电脑，配对完成后建立连接，电脑任务栏将会出现“设备已连接上电脑COMX口”之类的提示，然后再用串口软件（比如超级终端等）发送到刚才提示串口，Android手机就可以收到了。测试的时候请使用文件夹里的ECG.txt的心电数据文本文件，数据来源于MIT的心电数据库。PS：Android蓝牙只能在真机上运行。
- 2020-11-30下载
- 积分：1
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一种改进的TOA——AOA混合定位算法
混合定位中很不错的一篇文章，看过之后很受启发在TOA和AOA误差服从零均值的高斯分布时,以上⑧无AOAQ阵中AOATOA/AOA混合定位算法的克拉美一罗下界(CRLB)为:校准离差取rP=(GQG)90Q阵中AOA校准离差取(x-x1)/其中:G=(x-x r(y-m)/r(19)洲6050(x)2(+(y-y))(x-x)(+(y-y)0.020.040.060080.100.12(x-x1)AOA标准离差(stda,单位radx-图1都市环境中算法性能比较3仿真与分析为了检验和比较算法在实际蜂窝网络信道环境中的定位性能,假定在一蜂窝网络中,小区半径为2500m,参与TOA测量的BS为服务BS和4个相邻的BS,其位置坐标分别为(0,0),(4330,2500),(4330,2500),(0,5000),(-4330,2500)。假定由测量系统造成的TOA测量误差服从均值为0,方差为30米的高斯分布,信道环境造成的NIOS误差满是TP1.5信道模型14,服务BS始终能够提供AOA,AOA测量误差服从均值为0和一定标准差的高斯分布。图1为都市环境中假定只有服务BS能视距(LOS)传播时,MS在服务小区内均匀分布,在不同AOA标准差下算法定位误差在125m内的概率。图中可见,Q矩阵中σα的取值对算法定位性能有很大影响,在AOA标准差较小时用TOA测量值η近似替代σa能取得更好的定位性能,这是由于WLS算法采用了Q阵加权。此外,120只要AOA测量值达到一定精度(标准差小于一定值),采用10-10A-A0A00TOAAOA混合定位法就能取得比单纯TOA定位更好的性能。图29080为乡村环境中在不同AOA标准差下,由单纯TOA及 TOA/AOA70定位法(Q矩阵中取n=r)得到的由均方根误差(RMSE)表示的定位性能。由图2可见,乡村环境中由于TOA测量精度较高,30对AOA的精度要求也高。只有当AOA标准差更小(小于10-3)AOA标准离差(og)时,混合定位算法才能取得比单纯TOA定位更好的性能。图2乡村环境中算法性能比较为了检验MS与服务BS距离对算法定位性能的影响,在一般都市环境中可以假定MS位于与服务BS具有不同距离的两个位置(1200,0)和(2400,0)分别进行定位估计,五个BS具有非视距TOA测量值的概率分别为:0、0.2、04、0.6、0.8、1,服务BS能够提供的AOA测量误差分别服从均值为0,标准差为01、0.0lrad的高斯分布,Q矩阵中用r近似替代σn,对每个位置在每种条件下分别进行100次测量,算法在无AOA及具有两种标准差的AOA时的定位结果(RMSE)如图3、4所示仿真结果表明:AOA参与卜AOA标准离差=001AOA标准离差=0,01定位只有在AOA本身误差不大AOA标准离差=0.1AOA标准离差=0.1无AOA无AOA的情况下,才能对定位性能有改200善;如果AOA本身误差增大150则对TOA定位结果并不会有改l00善;MS距离服务BS越近,则50采用混合定位算法的效果越好。00.00.204060.810000.20.40.608104结论BS非视距概率Bs非视距概率图3个同标准差时算法图4不同标准差时算法本文的分析和仿真结果表性能比较(1200,0)性能比较(2400,0)明,只要服务BS提供的AOA测量值达到一定精度,合理选择Q矩阵中AOA标准差取值,本文提出的 TOA/AOA混合定位算法就o1994-2012ChinaAcademicJournalElectronicPUblishingHouseAllrightsreservedhttp:/www.cnki.neto1994-2012ChinaAcademicJournalElectronicPUblishingHouseAllrightsreservedhttp:/www.cnki.net
- 2020-12-02下载
- 积分：1
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64位与32位 rxtxserial.dll/rxtxParallel.dll
windows64位/32位串口开发用到的rxtxParallel.dll和rxtxSerial.dll
- 2020-12-05下载
- 积分：1
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基于MATLAB和HMM的说话人识别系统
本资源是基于MATLAB的说话人识别系统，是基于HMM模型 的，具有很高的识别效率，大家可以放心使用
- 2020-12-03下载
- 积分：1
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D2D仿真程序
该程序比较完整的分析了D2D通信的仿真程序，为研究D2D通信的研究着提供了研究的依据
- 2020-11-05下载
- 积分：1
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使用CC2591作为CC2530的功放
使用CC2591作为CC2530的功放, CC2591 PAThe absolute maximum ratings and operating conditions listed in the CC2530 datasheet [1]and the CC2591 datasheet [4] must be followed at all times. Stress exceeding one or more ofthese limiting values may cause permanent damage to any of the devicesNote that these characteristics are only valid when using the recommended register settingspresented in Section 4.6 and in Chapter 8, and the CC2530 - EM reference designOperating Frequency240524835MHzOperating Supply Voltage2036VOperating Temperature-40CTC=25C, VDD=3.0V, f=2440 MHz if nothing else is stated. All parameters are measuredon the CC2530-Cc2591EM reference design [11] with a 50 Q2 loadReceive CurrentWait for sync, -90 dBm input levelWait for sync, -50 dBm input level24mATXPOWER OXE5166mATXPOWER OXD5149mATXPOWER OXC5138mATXPOWER OXB5127mATransmit currentTXPOWER OXA5115ATXPOWER = 0X95100mATXPOWER = 0X8594ATXPOWE=0×75mATXPOWE=0×6579APower Down Current PM2UAISTRUMENTSPage 3 of 19SWRA308ATC=25C, Vdd=3.0V, f= 2440 MHz if nothing else is stated. All parameters are measuredon the CC2530-CC2591 EM reference design with a 50 Q2 loadReceive Sensitivity HGM 1 %PER, IEEE 802. 15.4[6] requires -85 dBm-988dBmReceive Sensitivity LGM1 PER, IEEE 802. 15.4 [6] requires -85 dBm-90.4dBmSaturationlEEE 802.15. 4 [6] requires-20 dBm10dBmWanted signal 3 db above the sensitivity levelIEEE 802.15.4 modulated interferer at ieee 802.15.4 channelsInterferer Rejection+5 MHz from wanted signal, IEEE 802. 15. 4 [6] requires 0 dBdB+10 MHz from wanted signal, IEEE 802. 15. 4 [6] requires 30 dB49dB+20 MHz from wanted signal wanted signal at- 82d BmdBdue to in the external lna and the offset in cc2530 the rssi readouts from cc2530CC2591 is different from rssi offset values for a standalone cc2530 design the offsetvalues are shown in table 4.4High Gain Mode79LoW Gain mode67Real rssi Register value-Rssl offsetISTRUMENTSPage 4 of 19SWRA308ATc=25C, Vdd=3.0V, f=2440 MHz if nothing else is stated All parameters are measuredon the CC2530-CC2591 EM reference design with a 50 Q2 load Radiated measurements aredone with the kit antennaRadiated Emissionwith TXPOWer Oxe5Conducted 2. RF (FCC restricted band)-462|dBmConducted 3. RF(FCC restricted band46.5 dBmComplies withFCC 15.247. SeeChapter 7 for moredetails about regulatoryRadiated 2.RF(FCC restricted band)42.2dBmrequirements andcomplianceIEEE 802.15.4[6]requires max.35%%Measured as defined by IEEE 802.15. 4 6TXPOWER OxE5. f= EEE 802.15. 4 channels13TXPOWER= OXD5. f= EEE 802.15.4 channelsTXPOWER= OXC5 f= EEE 802.15.4 channelsMax error∨ ectorTXPOWER OxB5 f= IEEE 802.15. 4 channelsMagnitude(EVM)TXPOWER OxA5. f= IEEE 802.15.4 channelsTXPOWER 0X95. f= IEEE 802. 15.4 channels643333%%%%%%%TXPOWER= 0x85. f= iEEE 802. 15.4 channelsTXPOWER =0x75 f= IEEE 802. 15.4 channels%TXPOWER= 065. f= iEEE 802. 15.4 channelsThe RF output power of the CC2530- CC2591 EM is controlled by the 7-bit value in theCC2530 TXPOWER register. Table 4.6 shows the typical output power and currentconsumption for the recommended power settings The results are given for Tc= 25 C, Vdd3.0V and f= 2440 MHz, and are measured on the cC2530-CC2591 EM reference designwith a 50 Q2 load. For recommendations for the remaining CC2530 registers, see Chapter 8 oruse the settings given by SmartRF StudioOXE520166OxD519149OxC18138OxB517127OxA5161150x95141000x8513940X75860x651079Note that the recommended power settings given in Table 4.6 are a subset of all the possibleTXPOWER register settings. However, using other settings than those recommended mightINSTRUMENTSPage 5 of 19SWRA308Aresult in suboptimal performance in areas like current consumption, EVM, and spuriousemissionTc=25C, Vdd=3.0V, f=2440 MHz if nothing else is stated All parameters are measuredon the CC2530-CC2591EM reference design with a 50 32 load2221-2V201918171611121314151617181920212223242526251510OxE5OxC5OxA50X850x65540-30-20-1001020304050607080ISTRUMENTSPage 6 of 19SWRA308A98Avg 3.6VAva 3vAvg 2V110111213141516171819202122232425261023.6V-1062V-110-40-30-20-100102030405060708070604020-Wanted signal at:-82 dBm10ISTRUMENTSPage 7 of 19SWRA308ACC2530-CC2591EM High Gain ModeC C2530-CC2591EM Low Gain Mode- CC2530EM40000-100110100908070-60-50-40-30-20-100The IEEE standard 802.15. 4 [8] requires the transmitted spectral power to be less than thelimits specified in table 4.7If-fc>3.5 MHz-20 dB-30 dBmThe results below are given for Tc=25 C, Vdd=3.0V and f= 2440 MHz, and are measuredon the CC2530-CC259 1EM reference design with a 50 Q loadIEEE absoluteChannel 182432.52435243752442524452447.5ISTRUMENTSPage 8 of 19SWRA308AOnly a few external components are required for the CC2530-CC2591 reference design. Atypical application circuit is shown below in Figure 5.1. Note that the application circuit figuredoes not show how the board layout should be done. The board layout will greatly influencethe RF performance of the CC2530-CC2591EM. TI provides a compact CC2530CC2591 EM reference design that it is highly recommended to follow. The layout, stack-upand schematic for the CC2591 need to be copied exactly to obtain good performance. Notethat the reference design also includes bill of materials with manufacturers and part numbersL102 L10=TI INF inductorVDD13cc2530LA 1RF PANTCC2591 RF NFNPA EN(P1 1)i工工I NA FNP:1HGM ENPO 7)T:1Proper power supply decoupling must be used for optimum performance. In Figure 5.1, onlythe decoupling components for the CC2591 are shown. This is because, in addition todecoupling, the parallel capacitors C11, C101, and C131 together with, L101, L102, TL11TL101 and TL131 also work as RF loads. These therefore ensure the optimal performancefrom the CC2591. C161 decouples the AvDD blAs power.The placement and size of the decoupling components, the power supply filtering and thePCB transmission lines are very important to achieve the best performance Details about theimportance of copying the CC2530-CC2591EM reference design exactly and potentialconsequences of changes are explained in chapter 6The RF input/output of CC2530 is high impedance and differential. The CC2591 includes abalun and a matching network in addition to the PA, LNa and RF switches which makes theinterface to the CC2530 seamless. Only a few components between the CC2530 andCC2591 necessary for RF matching For situation with extreme mismatch(VSWR 6: 1 till 12: 1out-of-band as shown in Figure 6.2) it is recommended to include all the components asshown in Figure 5.1ISTRUMENTSPage 9 of 19SWRA308ANote that the PCB transmission lines that connect the two devices also are part of the RFmatching. It is therefore important to copy the distance between the devices, the transmissionlines and the stack-up of the PCB according to the reference design to ensure optimumperformanceThe network between the CC2591 and the antenna(L111, C112, C111 C113 and L112matches the CC2591 to a 50 2 load and provides filtering to pass regulatory demands. C111also works as a dc-blockR151 is a bias resistor the bias resistor is used to set an accurate bias current for internaluse in the cc2591The TI reference design contains two antenna options. As default, the Sma connector isconnected to the output of CC2591 through a 0 Q2 resistor. This resistor can be soldered offand rotated 90 clockwise in order to connect to the PCB antenna, which is a planar invertedF antenna(PIFA). Note that all testing and characterization has been done using the SMAconnector. The PCB antenna has only been functionally tested by establishing a link betweentwo EMs. Please refer to the antenna selection guide [6] and the Inverted F antenna designnote [7 for further details on the antenna solutionsISTRUMENTSPage 10 of 19SWRA308A
- 2020-11-30下载
- 积分：1
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全国增值税发票查验平台验证码识别
验证码识别，文本识别网络-CRNN(CNN+GRU/LSTM+CTC) ，含部分数据集请配合博客 https://blog.csdn.net/okfu_DL/article/details/90379583 使用
- 2021-05-07下载
- 积分：1
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基于单片机的液位控制系统设计
液位测量广泛应用于工业、经济、生活等领域。本设计以水箱供水为模型，用于对水箱液位信号进行测量监控记录。基于单片机的液位测量装置具有测量准确、重复性好、功耗低、使用寿命长的特点，是广泛采用的技术。在深入学习科学发展观的同时，电子设备的设计也需融入可持续发展的设计理念。故此，在基于单片机的液位测量装置基础上，扩展实时监控、数据采集、计算机串行通信等功能，从而能够通过科学的方法将液位测量与统计科学结合，合理调度水资源，降低能源消耗。本文从系统方案选择与论证，硬件电路设计，系统软件与上位机软件设计等几个方面介绍了基于单片机的液位测量监控系统的设计过程，最终实现了液位的实时测量与监控。最后，本文总结
- 2020-12-11下载
- 积分：1
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一篇matlab自由曲面程序，主要涉及matlab
自由曲面透镜，均匀照明，涉及matlab编程，二次配光设计
- 2020-07-03下载
- 积分：1
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晶闸管相控整流直流电动机调速系统设计
晶闸管相控整流直流电动机调速系统设计晶闸管相控整流直流电动机调速系统设计晶闸管相控整流直流电动机调速系统设计
- 2020-12-07下载
- 积分：1
