【摘要】：擴(kuò)頻通信作為近年來(lái)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(cè)距等特點(diǎn),在軍用通信和民用通信中得到了廣泛的應(yīng)用。本文對(duì)擴(kuò)頻測(cè)控中的關(guān)鍵技術(shù)擴(kuò)頻信號(hào)的捕獲和同步進(jìn)行了研究,并將其運(yùn)用到國(guó)內(nèi)某彈載應(yīng)答機(jī)中。由于彈載應(yīng)答機(jī)的信號(hào)處理模塊芯片資源有限,在對(duì)傳統(tǒng)匹配濾波器捕獲法的捕獲性能和占用資源進(jìn)行軟件仿真和分析后,引出了數(shù)字差動(dòng)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(kuò)頻測(cè)控系統(tǒng)中使用的方法。由于地面信號(hào)和彈載應(yīng)答機(jī)之間的相對(duì)高速運(yùn)動(dòng)會(huì)產(chǎn)生很大的多普勒頻偏,使用普通的鎖相環(huán)進(jìn)行載波跟蹤將非常困難。本文提出了一種叉積自動(dòng)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(duì)其進(jìn)行軟件仿真和硬件測(cè)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(jì)方案。對(duì)其進(jìn)行實(shí)測(cè)和分析后,該環(huán)路在載噪比為27dB·Hz時(shí),能夠?qū)π盘?hào)進(jìn)行精確跟蹤。最后,在彈載應(yīng)答機(jī)上使用FPGA實(shí)現(xiàn)了本文提出的擴(kuò)頻信號(hào)捕獲和同步設(shè)計(jì),給出實(shí)際測(cè)量結(jié)果:系統(tǒng)捕獲時(shí)間為1.8s,測(cè)量偽距均值為5802.5ns,標(biāo)準(zhǔn)差為0.19ns,方差為0.0361ns2。測(cè)量精度高,滿足技術(shù)指標(biāo)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(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN914.42

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李陟;呂衛(wèi)華;;一種M序列構(gòu)造和優(yōu)選實(shí)現(xiàn)方法[J];哈爾濱商業(yè)大學(xué)學(xué)報(bào)(自然科學(xué)版);2016年03期

2 程誠(chéng);;一種基于多相濾波器的高速匹配濾波器方法[J];艦船電子對(duì)抗;2016年02期

3 楊丹;毛昱楓;于虹;;基于FPGA的自由空間音頻信號(hào)傳輸及頻譜顯示系統(tǒng)[J];電子器件;2015年04期

4 毛虎;吳德偉;盧虎;;對(duì)GPS接收機(jī)帶限高斯噪聲壓制干擾的干擾帶寬選擇分析[J];彈箭與制導(dǎo)學(xué)報(bào);2015年01期

5 劉崇華;崔小準(zhǔn);王璐;趙毅;付林春;;數(shù)字波形匹配的導(dǎo)航信號(hào)載波精密同步方法[J];中國(guó)計(jì)量學(xué)院學(xué)報(bào);2014年04期

6 謝建全;謝R，

本文編號(hào)：2351970