摘要: |
针对现有扩频码捕获方法在大动态下捕获时间长、硬件资源消耗大、动态适应性差的
问题,提出了一种改进的扩频码捕获方法。新方法把码钟多普勒的补偿放在本地扩频码上进
行,先对接收信号进行降采样和存储再进行频率分槽和补偿,一次采样实现了所有频率槽的
搜索。计算结果表明,完成同样的捕获过程新方法所需时间和存储器容量不到原方法的1/5
,且具备更强的动态适应能力。 |
关键词: 测控系统 扩频码捕获 大动态 多普勒补偿 |
DOI: |
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基金项目: |
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An improved PN code acquisition method in dynamic environment |
ZHANG BO |
() |
Abstract: |
A Pseudo Noise(PN) code acquisition method is proposed in order to
improve the performance of widely used coherentnoncoherent cascade acquisit
ion scheme. By performing code Doppler compensation on local code, and putting t
he frequency compensation after resampling and storage, repeated sampling is a
voided. Computation results show that for same acquisition task the new acquisit
ion scheme needs only 1/5 time and capacity, and has better dynamic adaptability. |
Key words: TT&C system PN code acquisition dynamic environment frequency compensation |