基于全相位频谱校正的TMBOC信号的捕获

Capture of TMBOC signals based on all-phase spectrum correction

针对使用传统部分匹配滤波器(PMF)结合快速傅里叶变换(FFT)无法精确捕获时分复用二进制偏移载波(TMBOC)调制信号的问题,提出一种基于全相位频谱校正的捕获方法。首先通过PMF过程对接收信号进行部分相关运算,再使用全相位快速傅里叶变换(ap FFT)算法对多普勒效应进行补偿,最后结合全相位频谱校正技术对功率谱进行校正。仿真结果表明,在同一条件下,该算法比PMF-FFT加窗算法检测概率提高了3 d B左右,并有效缩短了捕获时间。该算法可比PMF-FFT加窗算法更精确捕获TMBOC信号。

For the problem of the traditional partial matched filter( PMF) combined with fast Fourier transform( FFT) could not accurately capture the time-division multiplexed binary offset carrier( TMBOC) modulated signal,this paper proposed a capture method based on all-phase spectrum correction. Firstly,it received signal with PMF for partial correlation operation,then used the all-phase fast Fourier transform( apFFT) algorithm to compensate the Doppler effect. Finally,the power spectrum was corrected in combination with the all-phase spectrum correction technique. The experimental results show that,under the same conditions,the proposed scheme improves the detection probability by about 3 dB than the PMF-FFT windowing algorithm,and shortens effectively the acquisition time. This algorithm captures the TMBOC signal more accurately than the PMFFFT windowing algorithm.