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This book is about global navigation satellite systems (GNSS), their two main instru-
ments, which are a receiver and a simulator, and their applications. The book is based on
an operational off-the-shelf real-time software GNSS receiver and off-the-shelf GNSS
signalsimulator.Theacademicversionsofthesetoolsarebundledwiththisbookandfree
for readers to use for study and research.
標簽：
Navigation
Geophysics
Satellite
Digital
and
上傳時間：
2020-06-09
上傳用戶：shancjb
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Although state of the art in many typical machine learning tasks, deep learning
algorithmsareverycostly interms ofenergyconsumption,duetotheirlargeamount
of required computations and huge model sizes. Because of this, deep learning
applications on battery-constrained wearables have only been possible through
wireless connections with a resourceful cloud. This setup has several drawbacks.
First, there are privacy concerns. Cloud computing requires users to share their raw
data—images, video, locations, speech—with a remote system. Most users are not
willing to do this. Second, the cloud-setup requires users to be connected all the
time, which is unfeasible given current cellular coverage. Furthermore, real-time
applications require low latency connections, which cannot be guaranteed using
the current communication infrastructure. Finally, wireless connections are very
inefficient—requiringtoo much energyper transferredbit for real-time data transfer
on energy-constrained platforms.
標簽：
Embedded_Deep_Learning
Algorithms
上傳時間：
2020-06-10
上傳用戶：shancjb
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基于界面操作的人臉心率檢測的代碼，通過攝像頭實時采集人視頻，并計算心率(Face the heart rate detection interface operation based on the code, through real-time acquisition one camera video, and rate)
標簽：
操作
人臉
代碼
檢測
上傳時間：
2021-02-24
上傳用戶：
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基于TMS320F2812 光伏并網發電模擬裝置PROTEL設計原理圖+PCB+軟件源碼+WORD論文文檔,硬件采用2層板設計，PROTEL99SE 設計的工程文件，包括完整的原理圖和PCB文件，可以做為你的學習設計參考。 摘要：本文實現了一個基于TMS320F2812 DSP芯片的光伏并網發電模擬裝置，采用直流穩壓源和滑動變阻器來模擬光伏電池。通過TMS320F2812 DSP芯片ADC模塊實時采樣模擬電網電壓的正弦參考信號、光伏電池輸出電壓、負載電壓電流反饋信號等。經過數據處理后，用PWM模塊產生實時的SPWM 波，控制MOSFET逆變全橋輸出正弦波。本文用PI控制算法實現了輸出信號對給定模擬電網電壓的正弦參考信號的頻率和相位跟蹤，用恒定電壓法實現了光伏電池最大功率點跟蹤（MPPT），從而達到模擬并網的效果。另外本裝置還實現了光伏電池輸出欠壓、負載過流保護功能以及光伏電池輸出欠壓、過流保護自恢復功能、聲光報警功能、孤島效應的檢測、保護與自恢復功能。系統測試結果表明本設計完全滿定設計要求。關鍵詞：光伏并網，MPPT，DSP Photovoltaic Grid-connected generation simulator Zhangyuxin，Tantiancheng，Xiewuyang(College of Electrical Engineering, Chongqing University)Abstract: This paper presents a photovoltaic grid-connected generation simulator which is based on TMS320F2812 DSP, with a DC voltage source and a variable resistor to simulate the characteristic of photovoltaic cells. We use the internal AD converter to real-time sampling the referenced grid voltage signal, outputting voltage of photovoltaic, feedback outputting voltage and current signal. The PWM module generates SVPWM according to the calculation of the real-time sampling data, to control the full MOSFET inverter bridge output sine wave. We realized that the output voltage of the simulator can track the frequency and phase of the referenced grid voltage with PI regulation, and the maximum photovoltaic power tracking with constant voltage regulation, thereby achieved the purpose of grid-connected simulation. Additionally, this device has the over-voltage and over-current protection, audible and visual alarm, islanding detecting and protection, and it can recover automatically. The testing shows that our design is feasible.Keywords: Photovoltaic Grid-connected，MPPT，DSP 目錄引言 11. 方案論證 11.1. 總體介紹 11.2. 光伏電池模擬裝置 11.3. DC-AC逆變橋 11.4. MOSFET驅動電路方案 21.5. 逆變電路的變頻控制方案 22. 理論分析與計算 22.1. SPWM產生 22.1.1. 規則采樣法 22.1.2. SPWM 脈沖的計算公式 32.1.3. SPWM 脈沖計算公式中的參數計算 32.1.4. TMS320F2812 DSP控制器的事件管理單元 42.1.5. 軟件設計方法 62.2. MPPT的控制方法與參數計算 72.3. 同頻、同相的控制方法和參數計算 8
標簽：
tms320f2812
光伏
并網發電
模擬
protel
pcb
上傳時間：
2021-11-02
上傳用戶：
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設計了農業溫濕度智能控制系統,該系統采用DHT11溫濕度傳感器作為溫濕度采集模塊,單片機選用AT89C52代替并調用Virtual terminal模擬串口通信,LCD1604液晶顯示器實時顯示溫濕度,實現了溫濕度的測量、顯示,可自動控制加熱、降溫、加濕、通風,實現溫濕度控制以及超限報警處理,并利用Proteus與Keil進行實際電路的仿真。試驗表明,該系統實現了可靠的溫濕度監控。We described the design of an intelligent control system of agriculture temperature and humidity.The system uses DHT11 temperature and humidity sensor as the temperature and humidity acquisition module.The SCM adopts AT89C52 to replace and call the virtual terminal for simulating serial communication.LCD1604 displays temperature and humidity in real time,which implements the measurement and display of temperature and humidity.The system is able to automatically control heating,cooling,humidification and ventilation,to achieve temperature and humidity control and over-limit alarm processing.The system also uses Proteus and Keil for actual circuit simulation.The experiment shows that the system is capable of reliable temperature and humidity monitoring.
標簽：
at89c52
溫濕度智能控制系統
上傳時間：
2022-03-26
上傳用戶：aben
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配電網中,各種配電終端的電流、電壓、有功功率及無功功率等模擬量的采集是配電網自動化的重要環節。這些模擬量的采集也是各種儀器和家用電器的必要功能。因此,設計了基于嵌入式STM32F103單片機的交流電壓、交流電流及有功功率的采集系統,通過電壓互感器TV1005M和電流互感器TA1005M分別檢測交流電壓和交流電流值;屏幕或者手機APP和WiFi模塊互聯后,可以實時顯示交流電壓、交流電流、功率及電量值;通過設定閾值功率,可以實現對電流的監控和對電路的保護。In the distribution network,the collection of analog,such as current,voltage,active power,and reactive power at various distribution terminals is a very important part of distribution network automation. These analog acquisitions are also for various instruments and household appliances. Very important technology. Therefore,an AC voltage,AC current and active power acquisition system based on embedded STM32 F103 machine is designed,and AC voltage and AC current values are detected by voltage transformer TV1005 M and current Transformer TA1005 M respectively;After the screen or mobile phone APP and WiFi modules are interconnected,AC voltage,AC current,power,and power values can be displayed in real time;By setting the threshold power,the current can be monitored and the circuit can be protected.
標簽：
stm32f103
單片機
電流電壓采集
上傳時間：
2022-03-27
上傳用戶：shjgzh
-
設計了自動控制系統綜合實驗案例“基于LabVIEW和單片機的溫度控制系統設計”。實驗系統硬件部分由單片機、溫度傳感器、D/A轉換模塊、調壓模塊和電烤箱組成,設計了單片機與各個模塊之間的接口電路。軟件部分采用LabVIEW軟件實現控制算法,并設計監控界面實現參數設定、溫度數據實時監控等功能。設計了單片機與LabVIEW軟件之間的串口通信程序,實現了輸入、輸出數據的傳輸。通過綜合實驗系統設計,使學生得到控制系統設計和實驗調試等綜合能力的訓練。A comprehensive experimental case of the automatic control system is presented,which is the design of the temperature control system based on LabVIEW and SCM.The hardware part of the experimental system is composed of the SCM,temperature sensor,D/A conversion module,voltage regulating module and electric oven.The interface circuit between the SCM and each module is designed.In the software part,LabVIEW software is used to realize the control algorithm,and the monitoring interface is designed to realize the functions of parameter setting,temperature data real-time monitoring,etc.The serial communication program between the SCM and LabVIEW software is designed to realize the transmission of input and output data.Through the design of this comprehensive experimental system,students can get the comprehensive ability training for the control system design,experiment debugging,etc.
標簽：
labview
單片機
自動控制系統
上傳時間：
2022-03-27
上傳用戶：qdxqdxqdxqdx
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為了實時檢測血氧量,能使缺氧特別敏感的腦組織或心臟類疾病患者得到及時治療,采用近紅外雙波長透射式光電脈搏血氧測定法,以H橋電路對發射光源進行控制及通用運算放大器搭建濾波電路。運用參數理論計算和計算機仿真結果相對比的方法,通過Mu ltisim軟件對所設計電路進行仿真,仿真結果與理論參數計算相吻合,證明了電路參數設計的可行性,為血氧儀的實物制作提供參考。For real-time detection of oxygen saturation for timely treatment of the brain or heart,which are very sensitive to oxygen inadequacy,the near-infrared wavelengths double photoelectric pulse oximeter transmission method is adopted.The illuminant is controlled with the H bridge circuit and the filter circuit is built with general op-amps.Parameters by theoretical calculation is compared with the computer simulation results in Multisim and satisfactory results are obtained.It is shown that the design of the circuit parameters is feasible and can be a help in making the physical blood-oxygen monitor.
標簽：
multisim
光電二極管
濾波器
上傳時間：
2022-05-12
上傳用戶：
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摘要：介紹了以FreeModbus協議找在嵌入式搶占實時操作系統μC/OS-l的STM32平臺上，成功實現了Modbus協議的移植。通過詳細分析FreeModbus協議花并編寫STM32F103VET6微處理器的底層驅動，成功實現了工業Modbus協議RTU和ASCll兩種模式的通信功能。測試結果表明，在實際工業生產控制和儀表開發中，應用Freemodbus協議，完全符合工業數據采集、實時控制和數據處理等廠級重復性和精確度要求，在一定程度上降低了工業儀表開發的周期及成本。關鍵詞：實時操作系統，uC/OS-ll，FreeModbus，Modbus協議，STM32Abstract:This paper introduces FreeModbus stack transplanted to the STM32 platform which has been embedded in the preemptive real-time operating system uC/OS-ll，in order that the transplantation of the Modbus protocol is successfuly im-plemented.The FreeModbus stack is analyzed in detail and STM32F103VET6 microprocessor underlying driver is writed，so that the two Modbus industrial communication function RTU and ASCll are successfully realized.Keywords:time operating system，uC/OS-ll，.FreeModbus，Modbus協議，STM32
標簽：
freemodbus
通信協議
上傳時間：
2022-06-25
上傳用戶：
-
1.RTP概述1.1，RTP是什么TP全名是Real-time Transport Protocol（實時傳輸協議）。它是IETF提出的一個標準，對應的 RFC文檔為RFC3550（RFC1889為其過期版本）.RFC3550不僅定義了 RTP，而且定義了配套的相關協議 RTCP（Real-time Transport Control Protocol，即實時傳輸控制協議）。RTP用來為IP網上的語音、圖像、傳真等多種需要實時傳輸的多媒體數據提供端到端的實時傳輸服務。RTP為Internet上端到端的實時傳輸提供時間信息和流同步，但并不保證服務質量，服務質量由RTCP來提供。1.2.RTP的應用環境RTP用于在單播或多播網絡中傳送實時數據。它們典型的應用場合有如下幾個。（1）簡單的多播音頻會議。語音通信通過一個多播地址和一對端口來實現。一個用于音頻數據（RTP），另一個用于控制包（RTCP）2）音頻和視頻會議。如果在一次會議中同時使用了音頻和視頻會議，這兩種媒體將分別在不同的 RTP會話中傳送，每一個會話使用不同的傳輸地址（IP地址+端口）。如果一個用戶同時使用了兩個會話，則每個會話對應的 RTCP包都使用規范化名字CNAME（Canonical Name）。與會者可以根據RTCP包中的CNAME來獲取相關聯的音頻和視頻，然后根據 RTCP包中的計時信息（Network time protocol）來實現音頻和視頻的同步。
標簽：
udp
tcp
rtp
上傳時間：
2022-06-26
上傳用戶：
