Two 2D phase unwrapping approaches are included: 1. Phase quality guided path following method. 2. Goldstein's branch cut method. The algorithms are described in: D. C. Ghiglia and M. D. Pritt, Two-Dimensional Phase Unwrapping: Theory, Algorithms and Software. New York: Wiley-Interscience, 1998.
標簽： Unwrapping Phase 2D
上傳時間： 2016-04-30
上傳用戶：seanjsj
This reference design describes the design of a 3-phase AC induction vector control drive with position encoder coupled to the motor shaft. It is based on Motorola’s DSP56F805 dedicated motor control device. AC induction motors, which contain a cage, are very popular in variable speed drives. They are simple, rugged, inexpensive and available at all power ratings. Progress in the field of power electronics and microelectronics enables the application of induction motors for high-performance drives, where traditionally only DC motors were applied. Thanks to sophisticated control methods, AC induction drives offer the same control capabilities as high performance four-quadrant DC drives.
標簽： Reference Designer Manual Phase DRM 023 AC
上傳時間： 2020-06-10
上傳用戶：shancjb
偏移正交相移鍵控(OQPSK：Offset Quadrature Phase Shift Keying)調(diào)制技術(shù)是一種恒包絡(luò)調(diào)制技術(shù)，具有頻譜利用率高、頻譜特性好等特點，廣泛應(yīng)用于衛(wèi)星通信和移動通信領(lǐng)域。 論文以某型偵收設(shè)備中OQPSK解調(diào)器的全數(shù)字化為研究背景，設(shè)計并實現(xiàn)了基于FPGA的全數(shù)字OQPSK調(diào)制解調(diào)器，其中調(diào)制器主要用于仿真未知信號，作為測試信號源。論文研究了全數(shù)字OQPSK調(diào)制解調(diào)的基本算法，包括成形濾波器、NCO模型、載波恢復(fù)、定時恢復(fù)等；完成了整個調(diào)制解調(diào)算法的MATLAB仿真。在此基礎(chǔ)上，采用VHDL硬件描述語言在Xilinx公司ISE7.1開發(fā)環(huán)境下設(shè)計并實現(xiàn)了各個算法模塊，并在硬件平臺上加以實現(xiàn)。通過實際現(xiàn)場測試，實現(xiàn)了對所偵收信號的正確解調(diào)。論文還實現(xiàn)了解調(diào)器的百兆以太網(wǎng)接口，使得系統(tǒng)可以方便地將解調(diào)數(shù)據(jù)發(fā)送給計算機進行后續(xù)處理。
上傳時間： 2013-06-30
上傳用戶：Miyuki
偏移正交相移鍵控(OQPSK：Offset Quadrature Phase Shift Keying)調(diào)制技術(shù)是一種恒包絡(luò)調(diào)制技術(shù)，具有頻譜利用率高、頻譜特性好等特點，廣泛應(yīng)用于衛(wèi)星通信和移動通信領(lǐng)域。 論文以某型偵收設(shè)備中OQPSK解調(diào)器的全數(shù)字化為研究背景，設(shè)計并實現(xiàn)了基于FPGA的全數(shù)字OQPSK調(diào)制解調(diào)器，其中調(diào)制器主要用于仿真未知信號，作為測試信號源。論文研究了全數(shù)字OQPSK調(diào)制解調(diào)的基本算法，包括成形濾波器、NCO模型、載波恢復(fù)、定時恢復(fù)等；完成了整個調(diào)制解調(diào)算法的MATLAB仿真。在此基礎(chǔ)上，采用VHDL硬件描述語言在Xilinx公司ISE7.1開發(fā)環(huán)境下設(shè)計并實現(xiàn)了各個算法模塊，并在硬件平臺上加以實現(xiàn)。通過實際現(xiàn)場測試，實現(xiàn)了對所偵收信號的正確解調(diào)。論文還實現(xiàn)了解調(diào)器的百兆以太網(wǎng)接口，使得系統(tǒng)可以方便地將解調(diào)數(shù)據(jù)發(fā)送給計算機進行后續(xù)處理。
標簽： OQPSK FPGA 調(diào)制解調(diào)器
上傳時間： 2013-05-19
上傳用戶：zl123！@#
光纖水聽器自問世以來，在巨大的軍事價值和民用價值推動下得到了迅速發(fā)展，已逐漸從實驗室研究階段走向工程應(yīng)用。同時隨著光纖水聽器的不斷發(fā)展，對水聲信號的檢測技術(shù)以及數(shù)字處理能力也提出了新的要求。論文在此背景下開展了一系列研究工作，并提出了利用FPGA(Field ProgrammableGate Array，現(xiàn)場可編程門陣列)實現(xiàn)光纖3×3耦合器解調(diào)算法的新思路。 目前干涉型光纖水聽器的解調(diào)一般采用PGC(Phase Generated Carrier，相位生成載波技術(shù))技術(shù)和基于3×3光纖耦合器干涉的解調(diào)技術(shù)。PGC技術(shù)在解調(diào)過程中引入了載波信號，它對采樣率，激光器等的要求都較高，因此我們把目光投向3×3耦合器解調(diào)技術(shù)，文中對其解調(diào)原理進行了闡述，對采樣率的確定進行了討論，并對3×3耦合器三路輸出不對稱的情況進行了分析，最后在本文的結(jié)論部分提出了基于3×3耦合器解調(diào)的改良方案。 目前，光纖信號數(shù)字化解調(diào)的硬件實現(xiàn)采用DSP(Digital Signal Process，可編程數(shù)字信號處理器)信號處理機，與之相比，F(xiàn)PGA解調(diào)具有速度快、資源占用少、易于擴展等優(yōu)勢。本文對FPGA與DSP、ASIC(application-specificintegrated circuit，專用集成電路)實現(xiàn)方案進行了對比，分析了適合利用FPGA實現(xiàn)的算法所應(yīng)具備的特征；介紹了3×3耦合器解調(diào)算法中各個模塊的設(shè)計情況；分析了系統(tǒng)的工作情況，硬件的構(gòu)造及芯片的選擇，最后驗證了利用FPGA可以實現(xiàn)3×3耦合器解調(diào)算法。
標簽： 干涉型 光纖水聽器 信號解調(diào) 方法研究
上傳時間： 2013-07-03
上傳用戶：love1314
General Description The LM621 is a bipolar IC designed for commutation of brushless DC motors. The part is compatible with both three- and four-phase motors. It can directly drive the power switching devices used to drive the motor. The LM621 provides an adjustable dead-time circuit to eliminate ``shootthrough'' current spiking in the power switching circuitry. Operation is from a 5V supply, but output swings of up to 40V are accommodated. The part is packaged in an 18-pin, dual-in-line package.
上傳時間： 2013-07-24
上傳用戶：sdq_123
·【英文題名】 Research of Speed Regulate System of Three Phase BLDCM Based on DSP 【作者中文名】 劉桂芬; 【導(dǎo)師】 孟慶春; 【學(xué)位授予單位】 遼寧工程技術(shù)大學(xué); 【學(xué)科專業(yè)名稱】 控制理論與控制工程 【學(xué)位年度】 2007 【論文級別】 碩士 【網(wǎng)絡(luò)出版投稿人】 遼寧工程技術(shù)大學(xué) 【網(wǎng)絡(luò)出版投稿時間】 2006-01-02 【
標簽： DSP 三相 無刷直流電機 調(diào)速系統(tǒng)
上傳時間： 2013-06-19
上傳用戶：leileiq
Abstract: Transimpedance amplifiers (TIAs) are widely used to translate the current output of sensors like photodiode-to-voltagesignals, since several circuits and instruments can only accept voltage input. An operational amplifier with a feedback resistor fromoutput to the inverting input is the most straightforward implementation of such a TIA. However, even this simple TIA circuit requirescareful trade-offs among noise gain, offset voltage, bandwidth, and stability. Clearly stability in a TIA is essential for good, reliableperformance. This application note explains the empirical calculations for assessing stability and then shows how to fine-tune theselection of the feedback phase-compensation capacitor.
標簽： Transimpedance Stabilize Amplifier Your
上傳時間： 2013-11-13
上傳用戶：daoyue
Control systems are becoming increasingly dependent on digital processing and so require sensors able to provide direct digital inputs. Sensors based on time measurement, having outputs based on a frequency or phase, have an advantage over conventional analogue sensors in that their outputs can be measured directly in digital systems by pulse counting.
上傳時間： 2013-10-08
上傳用戶：wuyuying
Highlights the LTC1062 as a lowpass filter in a phase lock loop. Describes how the loop's bandwidth can be increased and the VCO output jitter reduced when the LTC1062 is the loop filter. Compares it with a passive RC loop filter. Also discussed is the use of LTC1062 as simple bandpass and bandstop filter.
上傳時間： 2013-10-24
上傳用戶：chens000
蟲蟲下載站版權(quán)所有 京ICP備2021023401號-1
