發(fā)布時(shí)間：2018-04-20 17:36

  本文選題：通信系統(tǒng) + 雷達(dá)方式通信��； 參考：《哈爾濱工業(yè)大學(xué)》2014年碩士論文

【摘要】：隨著科技的發(fā)展和進(jìn)步，探究多種電子設(shè)備、多種信號(hào)處理技術(shù)的一體化設(shè)計(jì)，采用相關(guān)技術(shù)去除高速環(huán)境下多普勒頻移的影響，實(shí)現(xiàn)高速移動(dòng)平臺(tái)下的實(shí)時(shí)高速率雷達(dá)方式通信已成為研究熱點(diǎn)。 在雷達(dá)方式通信可行性的基礎(chǔ)上，借用雷達(dá)系統(tǒng)實(shí)現(xiàn)通信信息的加載，使得一體化系統(tǒng)既能夠?qū)崿F(xiàn)對(duì)目標(biāo)的探測和定位，又能夠?qū)崿F(xiàn)信息的交互。利用OFDM技術(shù)的高頻帶利用率實(shí)現(xiàn)信息的高速率傳輸，然而，移動(dòng)平臺(tái)的高速運(yùn)動(dòng)產(chǎn)生較大的多普勒頻移，導(dǎo)致信號(hào)幅度衰減、相位偏移，并引起載波間干擾。通過對(duì)雙差分技術(shù)的分析，雖然雙差分技術(shù)對(duì)信噪比要求高，但該技術(shù)可有效去除多普勒頻移的影響，因此提出將雙差分技術(shù)與OFDM技術(shù)結(jié)合，實(shí)現(xiàn)高速移動(dòng)平臺(tái)下的信息實(shí)時(shí)高速率傳輸。 通過對(duì)OFDM技術(shù)的分析，以及相關(guān)算法性能的比較和驗(yàn)證，采用雙差分技術(shù)去除多普勒頻移的影響實(shí)現(xiàn)系統(tǒng)的載波同步，采用Park算法實(shí)現(xiàn)系統(tǒng)的定時(shí)同步、采用Nyquist脈沖成形技術(shù)降低系統(tǒng)的峰均比。當(dāng)多普勒頻移確定時(shí)，基帶數(shù)字調(diào)制方式編碼進(jìn)制越高，采用雙差分技術(shù)的OFDM系統(tǒng)所需信噪比越大，但高進(jìn)制編碼的OFDM系統(tǒng)頻帶利用率更高，在帶寬相同的情況下，信息的傳輸速率較高。 將通過雙差分處理的OFDM信號(hào)加載到雷達(dá)信號(hào)上，以S波段、X波段、K波段雷達(dá)通信系統(tǒng)為例，當(dāng)載波間隔遠(yuǎn)遠(yuǎn)大于多普勒頻移時(shí)，系統(tǒng)自身能夠?qū)崿F(xiàn)信息傳輸。但在某些特殊應(yīng)用場合下，移動(dòng)平臺(tái)的運(yùn)動(dòng)速度可達(dá)到第一宇宙速度，產(chǎn)生較大的多普勒頻移導(dǎo)致系統(tǒng)性能惡化；當(dāng)系統(tǒng)運(yùn)動(dòng)速度達(dá)到第一宇宙速度，多普勒頻移確定時(shí)，在信噪比滿足要求的情況下，采用雙差分技術(shù)的雷達(dá)通信系統(tǒng)能夠有效去除較大多普勒頻移的影響，且具有較高的信息傳輸速率，能夠?qū)崿F(xiàn)信息的實(shí)時(shí)高速率傳輸。 雷達(dá)系統(tǒng)與通信系統(tǒng)、OFDM技術(shù)與雙差分技術(shù)的結(jié)合，，能夠有效實(shí)現(xiàn)高速移動(dòng)平臺(tái)下的實(shí)時(shí)高速率雷達(dá)方式通信。
[Abstract]:With the development and progress of science and technology, the integrated design of various electronic equipment and signal processing technology is explored, and the influence of Doppler frequency shift in high speed environment is removed by using related technology. The realization of real-time high-rate radar communication on high-speed mobile platform has become a research hotspot. On the basis of the feasibility of radar communication, the radar system is used to realize the loading of communication information, so that the integrated system can not only realize the detection and location of the target, but also realize the information exchange. Using the high frequency band utilization of OFDM technology to realize high rate information transmission, however, the high speed motion of mobile platform produces large Doppler frequency shift, resulting in signal amplitude attenuation, phase offset, and inter-carrier interference. Through the analysis of the double difference technique, although the double difference technique requires high SNR, it can effectively remove the influence of Doppler frequency shift. Therefore, the combination of dual differential technique and OFDM technology is proposed. Real-time and high-rate information transmission on high-speed mobile platform is realized. Through the analysis of OFDM technology and the comparison and verification of the performance of related algorithms, the carrier synchronization of the system is realized by using double differential technique to remove the influence of Doppler frequency shift, and the timing synchronization of the system is realized by using Park algorithm. The peak to average ratio (PAPR) of the system is reduced by Nyquist pulse forming technology. When the Doppler frequency shift is determined, the higher the baseband digital modulation code is, the greater the signal-to-noise ratio (SNR) is required for the OFDM system with double difference technique, but the higher the frequency band efficiency of the high-band coded OFDM system is, the higher the bandwidth is when the bandwidth is the same. The transmission rate of information is high. The OFDM signal processed by double difference is loaded into the radar signal. Taking S-band X band radar communication system as an example, when the carrier interval is far larger than the Doppler frequency shift, the system can realize the information transmission itself. However, in some special applications, the moving speed of the mobile platform can reach the first cosmic velocity, which results in the deterioration of the system performance due to the large Doppler frequency shift, and when the system motion velocity reaches the first cosmic velocity, the Doppler frequency shift is determined. Under the condition that the SNR can meet the requirement, the radar communication system with double differential technique can effectively remove the influence of large Doppler frequency shift, and has higher information transmission rate, and can realize the real-time high rate transmission of information. The combination of OFDM technology and dual differential technology of radar system and communication system can effectively realize the real-time high rate radar mode communication under high-speed mobile platform.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.5

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