In order to meet the acquisition requirement of aerospace spread spectrum TTC system

a FFT-based code acquisition method was proposed which could reduce the spectrum peak degradation and get high frequency estimation accuracy.It integrated the data weighted by hanning window in the partial matched filter to reduce the spectrum peak degradation.Interpolated FFT was adopted to estimate the Doppler frequency in order to enhance the frequency estimation accuracy.According to the acquisition characteristics in different TTC conditions

two interpolation methods such as parabolic interpolation and improved Rife were analyzed.Both analysis and simulation demonstrate that the proposed method can reduce the spectrum peak degradation and improve the Doppler frequency estimation accuracy.