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  本文選題：GPS + 抗多徑��； 參考：《東南大學(xué)》2015年碩士論文

【摘要】：城市峽谷存在大量短多徑,定位精度受很大影響。傳統(tǒng)基帶多徑抑制技術(shù)只在碼相位一個維度改進(jìn)相關(guān)器設(shè)置,對中長多徑有很好抑制效果,但對短多徑抑制效果不佳。本文設(shè)計基于塊處理技術(shù)的抗多徑、低功耗接收機基帶,實現(xiàn)對短多徑抑制,提高城市峽谷中的定位精度。針對抗多徑需求,基帶采取塊處理技術(shù),在多普勒頻率和碼相位兩個維度并行搜索,利用接收的多徑信號與直達(dá)信號存在多普勒頻率差異,實現(xiàn)對短多徑抑制�；鶐щ娐吩O(shè)計32x17相關(guān)處理陣列,掃描32個頻點和17個碼相位點,基帶由12通道組成,每通道包含下變頻、混頻器、載波數(shù)字振蕩器、本地碼生成、相關(guān)器、累加器和相干存儲器等模塊。為驗證多徑抑制效果,基于德國宇航中心的陸地移動多徑信道模型搭建了多徑抑制效果驗證平臺,結(jié)果表明,在不同載噪比下,基帶的偽距均方根誤差為多徑延遲鎖定環(huán)的58-70%,在實際多徑場景中,基帶電路的定位精度與商業(yè)產(chǎn)品SiRFIV相當(dāng)。針對低功耗需求,基帶電路采取電壓調(diào)節(jié)和并行度調(diào)節(jié)結(jié)合的功耗優(yōu)化方法,電壓設(shè)為0.9V、0.8V、0.7V和0.6V,并行度設(shè)為1、2、4、8和16,共20種組合中尋找最低功耗設(shè)計。低電壓下電路單元延時波動,引起時序偏差,論文采取基于最大可能工作點的統(tǒng)計靜態(tài)時序分析,基帶電路時序分析結(jié)果為20種組合中有12種滿足電路時序要求。最終基帶電路的功耗優(yōu)化結(jié)果為單通道功耗從10.16mW降至1.93mW,下降了81.0%,最低功耗組合為電壓0.6V,并行度8。
[Abstract]:There are a large number of short and multipath in the city Canyon, and the positioning accuracy is greatly affected. The traditional baseband multipath suppression technology improves the correlator only on the one dimension of the code phase, and has a good inhibition effect on the medium and long multipath, but it is not good for the short multipath suppression. Diameter suppression, improve the positioning accuracy in the city canyon. The needle against multipath demand, the baseband take block processing technology, the Doppler frequency and code phase two dimensions parallel search, using the received multipath signal and the direct signal existence Doppler frequency difference, the realization of short multi path suppression. Baseband circuit design 32x17 correlation processing array, scanning 32 The base band is composed of 12 channels, and each channel consists of down conversion, mixer, carrier digital oscillator, local code generation, correlator, accumulator and coherent memory. In order to verify the effect of multipath suppression, the multi path suppression verification platform is built based on the land shift multipath channel model of the German Aerospace center. The results show that the root mean square root error of the baseband is 58-70% of the multipath delay locked loop under the different carrier noise ratio. In the actual multipath scene, the positioning precision of the baseband circuit is equivalent to that of the commercial product SiRFIV. For the low power consumption demand, the baseband circuit adopts the power optimization method combining voltage regulation and parallel degree adjustment, and the voltage is set to 0.9V, 0.8V, 0.7V and 0.6V, the degree of parallelism is set to 1,2,4,8 and 16. In all 20 combinations, the minimum power consumption is designed. The delay fluctuation of the circuit unit at low voltage causes the time series deviation. The paper adopts the statistical static time sequence analysis based on the maximum possible working point, and the base band circuit time series analysis results are the 12 kinds of circuit timing requirements in the 20 combinations. The final baseband is the final base band. The power optimization result of the circuit is that the single channel power consumption decreases from 10.16mW to 1.93mW, down by 81%, and the lowest power combination is voltage 0.6V and parallel degree 8..
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P228.4

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本文編號：1908868