基于擴頻測控系統(tǒng)的關(guān)鍵技術(shù)設(shè)計與實現(xiàn)
發(fā)布時間：2018-11-23 15:54
【摘要】：擴頻通信作為近年來迅速發(fā)展的一種通信技術(shù),由于其抗干擾性能好、保密性高、高精度測距等特點,在軍用通信和民用通信中得到了廣泛的應用。本文對擴頻測控中的關(guān)鍵技術(shù)擴頻信號的捕獲和同步進行了研究,并將其運用到國內(nèi)某彈載應答機中。由于彈載應答機的信號處理模塊芯片資源有限,在對傳統(tǒng)匹配濾波器捕獲法的捕獲性能和占用資源進行軟件仿真和分析后,引出了數(shù)字差動濾波器捕獲法。通過仿真和分析,該方法在完全不影響捕獲性能的前提下,能夠節(jié)省將近一半的硬件邏輯資源和功耗,是很值得在擴頻測控系統(tǒng)中使用的方法。由于地面信號和彈載應答機之間的相對高速運動會產(chǎn)生很大的多普勒頻偏,使用普通的鎖相環(huán)進行載波跟蹤將非常困難。本文提出了一種叉積自動頻率跟蹤算法和二階鎖頻環(huán)輔助三階鎖相環(huán)相結(jié)合的載波跟蹤方法,對其進行軟件仿真和硬件測試。再使用碼環(huán)的載波輔助技術(shù)提高跟蹤精度,并給出具體設(shè)計方案。對其進行實測和分析后,該環(huán)路在載噪比為27dB·Hz時,能夠?qū)π盘栠M行精確跟蹤。最后,在彈載應答機上使用FPGA實現(xiàn)了本文提出的擴頻信號捕獲和同步設(shè)計,給出實際測量結(jié)果:系統(tǒng)捕獲時間為1.8s,測量偽距均值為5802.5ns,標準差為0.19ns,方差為0.0361ns2。測量精度高,滿足技術(shù)指標要求。
[Abstract]:Spread spectrum communication, as a rapidly developing communication technology in recent years, has been widely used in military and civil communications because of its good anti-jamming performance, high confidentiality and high precision ranging. This paper studies the acquisition and synchronization of spread spectrum signal, which is the key technology of spread spectrum measurement and control, and applies it to a domestic missile transponder. Because of the limited chip resources of the signal processing module of the missile transponder, the acquisition performance of the traditional matched filter capture method and the resource occupation are simulated and analyzed by software, and the digital differential filter acquisition method is introduced. The simulation and analysis show that this method can save nearly half of the hardware logic resources and power consumption without affecting the acquisition performance at all. It is worth using in the spread spectrum measurement and control system. Because the relative high speed motion between the ground signal and the missile transponder will produce a very large Doppler frequency offset, it will be very difficult to track the carrier by using the ordinary phase-locked loop (PLL). In this paper, an automatic frequency tracking algorithm based on cross product and a carrier tracking method based on second-order frequency locked loop aided third-order phase-locked loop are proposed. The software simulation and hardware test are carried out. The tracking accuracy is improved by using the carrier-assisted technique of the code loop, and the specific design scheme is given. After the measurement and analysis, the loop can track the signal accurately when the carrier to noise ratio is 27dB Hz. Finally, the acquisition and synchronization design of spread spectrum signals proposed in this paper is realized by using FPGA on the missile transponder. The actual measurement results are as follows: the acquisition time of the system is 1.8s, the mean of measurement pseudo-range is 5802.5ns, and the standard deviation is 0.19ns. The variance was 0.0361nS2. The measurement accuracy is high and meets the requirement of technical index.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN914.42
[Abstract]:Spread spectrum communication, as a rapidly developing communication technology in recent years, has been widely used in military and civil communications because of its good anti-jamming performance, high confidentiality and high precision ranging. This paper studies the acquisition and synchronization of spread spectrum signal, which is the key technology of spread spectrum measurement and control, and applies it to a domestic missile transponder. Because of the limited chip resources of the signal processing module of the missile transponder, the acquisition performance of the traditional matched filter capture method and the resource occupation are simulated and analyzed by software, and the digital differential filter acquisition method is introduced. The simulation and analysis show that this method can save nearly half of the hardware logic resources and power consumption without affecting the acquisition performance at all. It is worth using in the spread spectrum measurement and control system. Because the relative high speed motion between the ground signal and the missile transponder will produce a very large Doppler frequency offset, it will be very difficult to track the carrier by using the ordinary phase-locked loop (PLL). In this paper, an automatic frequency tracking algorithm based on cross product and a carrier tracking method based on second-order frequency locked loop aided third-order phase-locked loop are proposed. The software simulation and hardware test are carried out. The tracking accuracy is improved by using the carrier-assisted technique of the code loop, and the specific design scheme is given. After the measurement and analysis, the loop can track the signal accurately when the carrier to noise ratio is 27dB Hz. Finally, the acquisition and synchronization design of spread spectrum signals proposed in this paper is realized by using FPGA on the missile transponder. The actual measurement results are as follows: the acquisition time of the system is 1.8s, the mean of measurement pseudo-range is 5802.5ns, and the standard deviation is 0.19ns. The variance was 0.0361nS2. The measurement accuracy is high and meets the requirement of technical index.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN914.42
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