[1]刘新宁,牛玉祥,戴晨.一种基于频率补偿的GPS位同步方法[J].东南大学学报(自然科学版),2014,44(6):1144-1148.[doi:10.3969/j.issn.1001-0505.2014.06.009]
 Liu Xinning,Niu Yuxiang,Dai Chen.GPS bit synchronization method based on frequency compensation[J].Journal of Southeast University (Natural Science Edition),2014,44(6):1144-1148.[doi:10.3969/j.issn.1001-0505.2014.06.009]
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一种基于频率补偿的GPS位同步方法()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
44
期数:
2014年第6期
页码:
1144-1148
栏目:
电磁场与微波技术
出版日期:
2014-11-20

文章信息/Info

Title:
GPS bit synchronization method based on frequency compensation
作者:
刘新宁牛玉祥戴晨
东南大学国家专用集成电路系统工程技术研究中心, 南京210096
Author(s):
Liu Xinning Niu Yuxiang Dai Chen
National ASIC System Engineering Research Center, Southeast University, Nanjing 210096, China
关键词:
GPS 位同步 相干累加 频率补偿
Keywords:
GPS(global positioning system) bit synchronization coherent accumulation frequency compensation
分类号:
TN967.1
DOI:
10.3969/j.issn.1001-0505.2014.06.009
摘要:
针对GPS接收机在跟踪过程中由频率误差引起的位同步概率下降问题,提出了一种基于频率补偿的GPS位同步方法.分析了环路中频率误差引起相干积分累加值衰减的机理,利用不同频率的复信号分别对相干积分结果进行补偿,计算出20个候选位置的值,最大值对应的位置即为数据边界位置.该方法有效减少了由频率误差导致的相干累加损耗,提高了位同步的概率.在弱信号情况下,使用非相干积分方法可进一步提高信号增益和位同步概率.与其他位同步方法相比,所提方法可容忍更大的频率误差,即使跟踪环路处于失锁状态也能准确实现位同步,且在频率误差小于25 Hz的情况下表现出更优的位同步性能.
Abstract:
In order to cope with the degradation of the bit synchronization probability of GPS(global positioning system)receivers caused by frequency deviation during the tracking stage, a bit synchronization method based on frequency compensation is proposed. The attenuation mechanism of the accumulation of coherent integration caused by frequency deviation is analyzed. By compensating the coherent integration results with complex signals of different frequencies, 20 candidates are calculated, and the maximum is on the data edge. This method can effectively reduce the attenuation of coherent accumulation caused by frequency deviation and improve the probability of bit synchronization. In the weak signal environment, non-coherent integration is used to further improve the signal gain and synchronization probability. Compared with other bit synchronization methods, the proposed method can tolerate larger frequency deviation and achieve bit synchronization even if the tracking loop is in unlocked status. Besides, it shows better bit synchronization performance when the frequency deviation is less than 25 Hz.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期: 2014-06-05.
作者简介: 刘新宁(1978—),男,博士生,讲师,xinning.liu@seu.edu.cn.
基金项目: 国家高技术研究发展计划(863计划)资助项目(2012AA012703).
引用本文: 刘新宁,牛玉祥,戴晨.一种基于频率补偿的GPS位同步方法[J].东南大学学报:自然科学版,2014,44(6):1144-1148. [doi:10.3969/j.issn.1001-0505.2014.06.009]
更新日期/Last Update: 2014-11-20