本文關(guān)鍵詞：GPS高動(dòng)態(tài)接收機(jī)跟蹤算法研究　出處：《華東交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 全球衛(wèi)星導(dǎo)航系統(tǒng) 高動(dòng)態(tài) 載波跟蹤 最佳帶寬 查找表 加權(quán) L2C

【摘要】：全球定位導(dǎo)航系統(tǒng)由于很少受時(shí)空限制，其在各領(lǐng)域被廣泛使用。特別在軍事領(lǐng)域，相關(guān)產(chǎn)品越來越注重快速、高精度的特點(diǎn)，對(duì)高動(dòng)態(tài)GPS接收機(jī)技術(shù)提出了更高的要求。由于在高動(dòng)態(tài)環(huán)境下，載體接收機(jī)接收到的信號(hào)具有較大的多普勒或多普勒變化率，這為實(shí)現(xiàn)對(duì)信號(hào)的跟蹤帶來了巨大的挑戰(zhàn)。而偽碼環(huán)中的多普勒偏移量可以利用載波環(huán)進(jìn)行補(bǔ)償而消除掉，所以本文著重設(shè)計(jì)高動(dòng)態(tài)場景下的載波跟蹤算法，本文主要研究工作如下： 首先文中在分析了鎖相環(huán)基本原理的基礎(chǔ)上，研究了不同階數(shù)載波跟蹤環(huán)對(duì)動(dòng)態(tài)信號(hào)的跟蹤效果，并進(jìn)行了仿真分析。 其次，文中根據(jù)鎖相環(huán)和鎖頻環(huán)環(huán)路誤差與環(huán)路參數(shù)的相互關(guān)系，，推導(dǎo)了環(huán)路最佳帶寬，并在此基礎(chǔ)上提出了基于查找表的載波環(huán)路增益控制算法。通過仿真實(shí)驗(yàn)表明，該算法使得環(huán)路對(duì)瞬態(tài)信號(hào)的響應(yīng)時(shí)間減小，對(duì)動(dòng)態(tài)的承受能力加強(qiáng)。 其次，重點(diǎn)在研究分析得出鎖相環(huán)相比較鎖頻環(huán)，具有更高精度但動(dòng)態(tài)承受能力弱的特點(diǎn)基礎(chǔ)上，提出了基于加權(quán)算法的載波跟蹤組合環(huán)路控制策略算法，該算法通過對(duì)動(dòng)態(tài)大小的檢測，利用加權(quán)算法對(duì)鎖相環(huán)和鎖頻環(huán)組合成新的復(fù)合環(huán)路。仿真結(jié)果表明：接收機(jī)能在最大加速度150g，加加速度50g/s的動(dòng)態(tài)指標(biāo)下正常工作。 其次，文中為了充分利用鎖相環(huán)精度高和鎖頻環(huán)動(dòng)態(tài)適應(yīng)性好的特點(diǎn)，提出了基于環(huán)路切換策略的高動(dòng)態(tài)載波跟蹤算法，該算法在傳統(tǒng)的環(huán)路中添加了環(huán)路切換策略，使得環(huán)路切換更具有平穩(wěn)性。仿真結(jié)果說明：載體在信號(hào)強(qiáng)度為45dB-Hz，以5g和10g加速度分時(shí)間段做勻加速運(yùn)動(dòng)的場景下，基于環(huán)路切換策略的高動(dòng)態(tài)載波跟蹤算法使得環(huán)路的切換次數(shù)和抖動(dòng)現(xiàn)象明顯減少，切換次數(shù)相比傳統(tǒng)環(huán)路減少了82%。 最后文中針對(duì)現(xiàn)代化L2C信號(hào)跟蹤算法進(jìn)行了研究，仿真分析表明：相比較單跟蹤C(jī)M或CL信號(hào)，L2C融合跟蹤算法擁有更小的環(huán)路測量誤差和更佳的跟蹤性能。
[Abstract]:The global positioning system with little by time and space, it is widely used in various fields. Especially in the military field, more and more attention to the related products fast, high precision, put forward higher requirements for high dynamic GPS receiver technology. Due to the high dynamic environment, the received signal carrier receiver with Doppler or Doppler changing rate, which brings a great challenge for the realization of the signal tracking. Doppler offset ring in pseudo code can be used to compensate and eliminate the carrier loop, so this paper focuses on the design of carrier tracking under high dynamic scene algorithm, the main research work are as follows:
First, based on the analysis of the basic principle of PLL, the tracking effect of different order carrier tracking loop on dynamic signal is studied, and simulation analysis is carried out.
Secondly, according to the relationship between the PLL and FLL and PLL loop error parameters, deduces the best loop bandwidth is proposed based on carrier loop gain control algorithm based on look-up table. The simulation results show that the algorithm makes the loop response time of transient signal decreases, strengthen the dynamic bearing ability.
Secondly, the phase locked loop frequency locked loop comparative analysis with emphasis on research, with higher accuracy but the dynamic characteristics of foundation bearing capacity is weak, we propose a tracking algorithm of carrier loop control algorithm based on the weighted algorithm, through the detection of dynamic size, using the weighted algorithm of PLL and FLL compound a new loop. The simulation results show that the receiver can work normally in the maximum acceleration of 150g, dynamic index jerk 50g/s.
Secondly, in this paper, in order to make full use of PLL frequency locked loop high precision and better dynamic adaptability characteristics, put forward the high dynamic carrier tracking algorithm based on loop switching strategy, the algorithm adds loop switching strategy in the traditional loop, the loop switch is more stable. The simulation results showed that the intensity of the signal as carrier in 45dB-Hz 5g and 10g, to the time period of acceleration of uniformly accelerated motion in the scene, high dynamic carrier tracking loop switching strategy algorithm makes the switching frequency and jitter loop decreased based on the switching times compared with the traditional loop is reduced by 82%.
Finally, the modern L2C signal tracking algorithm is studied. Simulation analysis shows that compared with single tracking CM or CL signal, L2C fusion tracking algorithm has smaller loop measurement error and better tracking performance.

【學(xué)位授予單位】：華東交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：P228.4

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