本文選題：衛(wèi)星導(dǎo)航系統(tǒng) + 濾波器��； 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：衛(wèi)星導(dǎo)航系統(tǒng)在軍事通信領(lǐng)域中具有很高的應(yīng)用價(jià)值。面對(duì)越來(lái)越復(fù)雜的空間干擾環(huán)境,衛(wèi)星導(dǎo)航鏈路的抗干擾技術(shù)研究更有著重大的意義。在傳統(tǒng)的通信鏈路中,現(xiàn)有通信抗干擾算法可達(dá)到很理想的誤碼率要求,但其沒(méi)有考慮對(duì)測(cè)距算法的影響。為了滿足載波相位測(cè)距算法對(duì)相位的嚴(yán)格要求,在研究經(jīng)典時(shí)域抗干擾算法的基礎(chǔ)上,本文提出了一種新的針對(duì)衛(wèi)星導(dǎo)航鏈路的抗干擾系統(tǒng)實(shí)現(xiàn)方案,并利用MATLAB對(duì)該系統(tǒng)進(jìn)行了性能仿真分析,仿真結(jié)果表明:與現(xiàn)有抗干擾系統(tǒng)相比,新的抗干擾系統(tǒng)能夠減小對(duì)信號(hào)相位的影響。本論文的主要工作如下:1.分析了兩種經(jīng)典的抗干擾技術(shù):時(shí)域干擾抑制和變換域干擾抑制。重點(diǎn)研究了時(shí)域自適應(yīng)濾波算法和濾波器的實(shí)現(xiàn),并指出FIR濾波器具有良好的線性相位特性。2.研究了衛(wèi)星導(dǎo)航信號(hào)的載波相位測(cè)量原理。指出相位測(cè)量算法對(duì)載波相位有著非常嚴(yán)格的要求,且其測(cè)量精度比偽碼測(cè)距算法還要高,但需要解決整周期模糊問(wèn)題。另外,還對(duì)鎖頻環(huán)的基本原理和對(duì)稱(chēng)系數(shù)FIR濾波器的設(shè)計(jì)方法進(jìn)行了分析和研究。3.提出了一種基于BPSK調(diào)制的直接序列擴(kuò)頻抗干擾系統(tǒng)實(shí)現(xiàn)方案。以掃頻干擾為例,改變陷波器在系統(tǒng)中所處的位置,對(duì)該抗干擾系統(tǒng)進(jìn)行性能仿真,觀察抗干擾技術(shù)對(duì)導(dǎo)航信號(hào)相位的影響,并給出了系統(tǒng)的誤碼性能曲線。4.基于FPGA硬件開(kāi)發(fā)平臺(tái),具體分析了下變頻、鎖頻環(huán)、陷波器等關(guān)鍵子模塊的實(shí)現(xiàn)難點(diǎn),并利用Verilog HDL語(yǔ)言完成了抗干擾模塊的FPGA實(shí)現(xiàn)。對(duì)該抗干擾模塊進(jìn)行仿真驗(yàn)證,將其輸出結(jié)果與MATLAB仿真結(jié)果進(jìn)行對(duì)比可得:抗干擾模塊的FPGA實(shí)現(xiàn)滿足設(shè)計(jì)系統(tǒng)的性能指標(biāo)要求。
[Abstract]:Satellite navigation system has high application value in military communication field. In the face of more and more complex space jamming environment, it is of great significance to study the anti-jamming technology of satellite navigation link. In the traditional communication link, the existing communication anti-jamming algorithm can meet the ideal bit error rate requirement, but it does not consider the influence on the ranging algorithm. In order to meet the strict requirements of the carrier phase ranging algorithm, a new anti-jamming system for satellite navigation link is proposed based on the study of classical time-domain anti-jamming algorithm. The performance of the system is simulated by MATLAB. The simulation results show that compared with the existing anti-jamming system, the new anti-jamming system can reduce the influence on the signal phase. The main work of this thesis is as follows: 1. Two classical anti-jamming techniques, time domain interference suppression and transform domain interference suppression, are analyzed. The realization of adaptive filtering algorithm and filter in time domain is mainly studied, and it is pointed out that FIR filter has good linear phase characteristic. The principle of carrier phase measurement of satellite navigation signal is studied. It is pointed out that the phase measurement algorithm has very strict requirements for carrier phase, and its measurement accuracy is higher than that of pseudo code ranging algorithm, but it needs to solve the whole period ambiguity problem. In addition, the basic principle of frequency locked loop and the design method of symmetric coefficient FIR filter are analyzed and studied. A scheme of direct sequence spread spectrum anti-jamming system based on BPSK modulation is proposed. Taking the sweep interference as an example, the position of the notch filter in the system is changed, the performance of the anti-jamming system is simulated, the influence of anti-jamming technology on the phase of navigation signal is observed, and the error performance curve of the system is given. Based on the hardware development platform of FPGA, this paper analyzes the difficulties in the realization of the key sub-modules, such as downconversion, frequency locking loop, notch filter and so on, and implements the anti-jamming module with FPGA using Verilog HDL language. The simulation results of the anti-jamming module are compared with the results of MATLAB simulation. The FPGA implementation of the anti-jamming module meets the performance requirements of the design system.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN967.1

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本文編號(hào)：1905078