基于FPGA的擴頻通信測距測速系統(tǒng)設(shè)計與實現(xiàn)
本文選題:直接序列擴頻通信 + 偽碼同步。 參考:《華中科技大學(xué)》2014年碩士論文
【摘要】:本文介紹了一種基于FPGA實現(xiàn)的擴頻測距測速系統(tǒng),該系統(tǒng)用于空間衛(wèi)星距離速度的測量,同時實現(xiàn)衛(wèi)星與地面的擴頻通信。 本文設(shè)計的測距測速系統(tǒng)包括測距測速和遙控遙測兩個通道。測距測速通道接收來自地面的兩路擴頻測量幀,解算出上行偽距、偽多普勒,并將上行偽距、偽多普勒插入到下行測量幀進行擴頻調(diào)制、載波調(diào)制后發(fā)往地面。遙控遙測通道接收地面測控站發(fā)送的上行擴頻遙控信號,完成解擴、解調(diào),并將解擴解調(diào)后的遙控信號送遙控單元,同時接收遙控單元送來的遙測信號進行編碼擴頻調(diào)制輸出。 經(jīng)過大量的理論分析和驗證,本課題采用FPGA來實現(xiàn)擴頻測距測速系統(tǒng)的基帶電路,根據(jù)系統(tǒng)的各項參數(shù)和指標(biāo)要求設(shè)計并實現(xiàn)發(fā)送信號的偽隨機碼調(diào)制、接收信號的偽碼捕獲與跟蹤、載波跟蹤、數(shù)據(jù)的解調(diào)以及與嵌入式處理器的接口設(shè)計。 本文首先對擴頻通信的基本原理和直接序列擴頻通信系統(tǒng)的基本結(jié)構(gòu)進行了闡述,解釋了擴頻通信用于測距測速的基本原理,然后根據(jù)系統(tǒng)的各項指標(biāo)要求給出了系統(tǒng)總體的設(shè)計方案,并對擴頻測距測速系統(tǒng)進行了功能劃分,,然后對系統(tǒng)的FPGA邏輯設(shè)計和實現(xiàn)原理進行了詳細(xì)完整的闡述。 擴頻測距測速接收機設(shè)計已經(jīng)順利完成,并進行了最終的測試,接收機工作穩(wěn)定,各項指標(biāo)均達(dá)到設(shè)計要求。
[Abstract]:In this paper, a spread spectrum ranging and velocimetry system based on FPGA is introduced. The system is used to measure the distance velocity of space satellite, and the spread spectrum communication between satellite and ground is realized at the same time. The system includes two channels: ranging and telemetry. The range measurement channel receives two spread spectrum measurement frames from the ground, solves the uplink pseudo-range, pseudo Doppler, and inserts the uplink pseudo-range, pseudo Doppler into the downlink measurement frame for spread spectrum modulation, then the carrier modulation is sent to the ground. The remote control channel receives the uplink spread spectrum remote control signal from the ground measurement and control station, completes the despreading and demodulating, and sends the despreading and demodulating remote control signal to the remote control unit, while receiving the remote sensing signal sent by the remote control unit to code the spread spectrum modulation output. After a lot of theoretical analysis and verification, this paper uses FPGA to realize the baseband circuit of spread spectrum ranging and velocimetry system, and designs and realizes the pseudorandom code modulation of the transmitted signal according to the system parameters and specifications. PN code acquisition and tracking, carrier tracking, data demodulation and interface design with embedded processor. In this paper, the basic principle of spread spectrum communication and the basic structure of direct sequence spread spectrum communication system are described, and the basic principle of spread spectrum communication used in ranging and velocimetry is explained. Then according to the requirements of each index of the system, the overall design scheme of the system is given, and the function of the spread spectrum ranging and velocimetry system is divided. Then, the FPGA logic design and the realization principle of the system are described in detail. The design of spread spectrum ranging and velocimetry receiver has been completed successfully and the final test has been carried out. The receiver works stably and each index meets the design requirements.
【學(xué)位授予單位】:華中科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TN914.42
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