| 摘要: |
| 与传统捕获方法相比，P码信号直接捕获具有很强的抗干扰能力，因此近年来国内
外对P码直接捕获方法研究也很多，这些方法大多是基于均值法和XFAST方法进行计算量的缩
减，但计算量缩减对于捕获效果会有一定的影响，而对于捕获影响的定量分析以及捕获方法
所适用的范围很少进行讨论。通过理论分析和仿真实验得出了典型的两种P码直接捕获方法
中参数设置值和信噪比损失的关系，为这两种P码直接捕获方法的适用应用范围提供了
一定的理论依据，并对基于这两种的其他捕获方法的应用范围提供了参考。 |
| 关键词: 全球定位系统 P码 直接捕获 扩频增益 信噪比损失 |
| DOI： |
|
| 基金项目:国家自然科学基金资助项目（61101215）；航空科学基金项目(20100818020，20100818022)；中央高校基本科研业务费(CHD2011JC084, CHD2011JC049, CHD2011JC014)；陕西省自然科学基础研究计划(2011JQ8014) |
|
| Analysis of SNR loss in P-code direct acquisition methods |
| WANG Jiang-an,LIU Peng-ju,ZHANG Hui-suo |
| () |
| Abstract: |
| Compared with traditional acquisition methods，P-code direct acquisitio
n possesses a strong anti-jamming capability. Therefore，there have been many n
ew computat
ion reduction methods for P-code direct acquisition which are based on the XFAS
T(Extended Replica Folding Acquisition Search Technique)
and average method. The computation reduction has some effect on signal acquisit
ion, but there is no quantitative analysis on the effect and the application fil
ed of P-code direct acquisition methods. Through theoretical analysis and simul
ation, the relationship between parameters setting and the SNR(Signal-to-noise Ra
tio) loss of the two typical direct acquisition methods are obtained, which is useful in application field selection, and also has the reference value for other P-code direct a
cquisition design. |
| Key words: P-code direct acquisition spreading gain SNR loss |
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