【摘要】：為了提高激光測(cè)距系統(tǒng)抗雜光干擾的性能,改善多系統(tǒng)聯(lián)合測(cè)試或存在其他激光脈沖信號(hào)的背景環(huán)境下系統(tǒng)測(cè)量的可靠性,本文提出一種基于CDMA的跳頻調(diào)制擾算法,并以FPGA技術(shù)為核心,設(shè)計(jì)了一套體積小,可靠性高的激光測(cè)距系統(tǒng)。本文的研究內(nèi)容為基于CDMA的激光測(cè)距系統(tǒng)抗干擾原理分析以及測(cè)距系統(tǒng)軟件和硬件部分的設(shè)計(jì)。首先,從傳統(tǒng)的激光測(cè)距原理出發(fā),系統(tǒng)分析了幾種常見測(cè)距方法的原理和優(yōu)缺點(diǎn),并對(duì)影響激光測(cè)距系統(tǒng)可靠性的原因進(jìn)行了分析；然后,以跳頻技術(shù)為基礎(chǔ),分析了幾種常見偽隨機(jī)碼的特性,選用自互相關(guān)性好的Gold碼為跳頻碼,建立基于跳頻技術(shù)的抗干擾測(cè)距系統(tǒng)模型,并結(jié)合硬件要求完成基于CDMA的激光測(cè)距系統(tǒng)的整體方案設(shè)計(jì)和系統(tǒng)測(cè)試。測(cè)距系統(tǒng)軟件部分采用Verilog HDL語言編程實(shí)現(xiàn)偽隨機(jī)碼生成器,跳頻調(diào)制器,門限檢測(cè),測(cè)距計(jì)數(shù)器等模塊的設(shè)計(jì)；硬件部分選取合適的芯片完成激光發(fā)射,回波接收,FPGA處理三部分電路的設(shè)計(jì)。本文完成了FPGA各功能模塊的軟件設(shè)計(jì)與仿真以及硬件電路的設(shè)計(jì)和調(diào)試,并對(duì)測(cè)距系統(tǒng)進(jìn)行了實(shí)際的測(cè)試和抗干擾性能的分析,對(duì)實(shí)驗(yàn)數(shù)據(jù)和實(shí)驗(yàn)誤差進(jìn)行了分析和評(píng)估。實(shí)驗(yàn)結(jié)果表明,該系統(tǒng)各部分的功能均己實(shí)現(xiàn),在多個(gè)系統(tǒng)聯(lián)合測(cè)試或存在其他激光脈沖信號(hào)干擾的情況下也可獲得準(zhǔn)確的測(cè)量結(jié)果,即本文提出的基于CDMA的激光測(cè)距系統(tǒng)具有更好的抗干擾能力,達(dá)到了課題研究的要求。
[Abstract]:In order to improve the performance of laser ranging system against clutter interference and improve the reliability of system measurement under the background environment of multi-system joint testing or other laser pulse signals, a frequency-hopping modulation and scrambling algorithm based on CDMA is proposed in this paper. A laser ranging system with small volume and high reliability is designed based on FPGA technology. The research content of this paper is the analysis of anti-jamming principle of laser ranging system based on CDMA, and the design of software and hardware of ranging system. Firstly, based on the traditional laser ranging principle, the principles, advantages and disadvantages of several common ranging methods are systematically analyzed, and the reasons that affect the reliability of laser ranging system are analyzed. Then, based on the frequency hopping technology, the characteristics of several common pseudorandom codes are analyzed. The frequency hopping codes are selected as the Gold codes with good autocorrelation, and the anti-jamming ranging system model based on the frequency hopping technology is established. The overall scheme design and system test of laser ranging system based on CDMA are completed in combination with hardware requirements. In the software part of the ranging system, the pseudorandom code generator, frequency hopping modulator, threshold detection, ranging counter and other modules are designed by using Verilog HDL language. In the hardware part, the appropriate chip is selected to complete the design of laser emission, echo receiving and FPGA processing circuit. In this paper, the software design and simulation of each functional module of FPGA and the design and debugging of hardware circuit are completed, and the actual test and anti-jamming performance of the ranging system are carried out, and the experimental data and experimental error are analyzed and evaluated. The experimental results show that the functions of each part of the system have been realized, and the accurate measurement results can be obtained in the case of the joint testing of multiple systems or the presence of other laser pulse signal interference. That is to say, the laser ranging system based on CDMA has better anti-jamming capability and meets the requirements of the research.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN248

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