基于全相位频谱校正的TMBOC信号的捕获

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（apFFT）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 dB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。

Capture of TMBOC signals based on all-phase spectrum correction

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 receivd 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 PMF-FFT windowing algorithm.