一种基于块处理技术的抗多径、低功耗GPS基带的设计

发布时间：2018-05-19 05:20

本文选题：GPS + 抗多径　；参考：《东南大学》2015年硕士论文

【摘要】：城市峡谷存在大量短多径,定位精度受很大影响。传统基带多径抑制技术只在码相位一个维度改进相关器设置,对中长多径有很好抑制效果,但对短多径抑制效果不佳。本文设计基于块处理技术的抗多径、低功耗接收机基带,实现对短多径抑制,提高城市峡谷中的定位精度。针对抗多径需求,基带采取块处理技术,在多普勒频率和码相位两个维度并行搜索,利用接收的多径信号与直达信号存在多普勒频率差异,实现对短多径抑制。基带电路设计32x17相关处理阵列,扫描32个频点和17个码相位点,基带由12通道组成,每通道包含下变频、混频器、载波数字振荡器、本地码生成、相关器、累加器和相干存储器等模块。为验证多径抑制效果,基于德国宇航中心的陆地移动多径信道模型搭建了多径抑制效果验证平台,结果表明,在不同载噪比下,基带的伪距均方根误差为多径延迟锁定环的58-70%,在实际多径场景中,基带电路的定位精度与商业产品SiRFIV相当。针对低功耗需求,基带电路采取电压调节和并行度调节结合的功耗优化方法,电压设为0.9V、0.8V、0.7V和0.6V,并行度设为1、2、4、8和16,共20种组合中寻找最低功耗设计。低电压下电路单元延时波动,引起时序偏差,论文采取基于最大可能工作点的统计静态时序分析,基带电路时序分析结果为20种组合中有12种满足电路时序要求。最终基带电路的功耗优化结果为单通道功耗从10.16mW降至1.93mW,下降了81.0%,最低功耗组合为电压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..
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P228.4

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