Communications terminal and operating method

摘要

A non-coherent technique employs a zero padded FFT for the fast acquisition of direct sequence spread spectrum signals in the presence of large Doppler shifts. The application of a FFT to code acquisition results in decreased acquisition time, and can improve the probability of detection. A set of partial correlators ( 1 ) and a zero padded FFT ( 2 ) are used to reduce the search region for code acquisition while maintaining good frequency resolution for Doppler offset. This approach will prove most pertinent in future reconfigurable terminals.