基于SFT的码移键控信号解调跟踪方法Code-shift-keying signal demodulation and tracking method based on the sparse fourier transformation
彭汉斌,陈昱均,纪元法
摘要(Abstract):
码移键控(CSK)调制在不改变原有信号频谱特性情况下,满足高速率信息传输需求,成为低轨卫星导航信号体制的候选。解调CSK信号需要计算每个码相位的相关值,为了降低运算量,通常使用FFT频域解调代替时域解调。根据CSK信号相关值具有稀疏的特性以及仅需部分输出结果的特点,优化稀疏傅里叶变换(SFT)流程,实现高效率解调。此外,在基于SFT解调算法基础上对跟踪环的支路生成方式进行改进,实现对动态CSK信号的跟踪,从而解决了由于CSK调制破坏了扩频码的周期性,导致无法直接对信号进行跟踪的问题。仿真结果表明,基于SFT解调算法能将其效率提高到原来的2.59倍,改进后的跟踪环路可以实现对较高动态的CSK信号进行跟踪.解调,具有一定的工程意义。
关键词(KeyWords): 码移键控;稀疏傅里叶变换;混叠;解调;跟踪
基金项目(Foundation): 广西科技厅项目(桂科AA23062038,桂科AD22080061,桂科AB23026120,桂科ZY22096026);; 国家自然科学基金(U23A20280,62161007,62061010);; 桂林市科技项目(20210222-1);; 认知无线电与信息处理教育部重点实验室主任基金(CRKL220102);; 广西高校中青年教师科研基础能力提升项目(2022KY0181);; 广西精密导航与应用重点实验室开放基金(DH202215)
作者(Author): 彭汉斌,陈昱均,纪元法
DOI: 10.16725/j.1673-808X.202412
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