• A NOVEL FFT-BASED TECHNIQUE FOR RAPID ACQUISITION OF HIGH DYNAMIC DSSS SIGNAL

      Ming, Wang; Taotao, Liang; Guoning, Ma; Yudong, He; Institute of Electronic Engineering, China Academy of Engineering Physics (International Foundation for Telemetering, 2019-10)
      High dynamic direct sequence spread spectrum (DSSS) signal acquisition process is a two-dimensional signal replication process no matter what acquisition methods are used. In this paper, acquisition methods in dynamic surroundings are researched. The analysis tells that, serial acquisition methods cannot meet the requirement of flight application, which requires correct signal capturing possibility of weak signal and less acquisition time. A new improved acquisition approach using partial correlator and Fast Fourier Transform (FFT) is introduced. The method can search Doppler and calculate C/A code phases in parallel. Matlab simulation indicate that, the FFT-based algorithm can work well in high dynamic DSSS receiver.
    • A NOVLE COMBINING ACQUISITION ALGORITHM WITH DATA AND PILOT SIGNALS OF BDS-3 B1C SIGNAL

      Taotao, Liang; Ming, Wang; Junwei, Wu; Chuan, Wang; Institute of Electronic Engineering, China Academy of Engineering Physics (International Foundation for Telemetering, 2019-10)
      The B1C signal adopts a new navigation signal system including pilot and data signal. These two signals are transmitted simultaneously in an orthogonal manner. When the signal is weak, two signals need to be processed jointly to improve the signal detection ability. This paper designs a novel weighted joint acquisition algorithm. Monte Carlo simulation has been done to evaluate the performance. The simulation results show that the detection performance of the proposed algorithm connects with the weighted coefficient. When the optimal weighting coefficient is selected, detection performance can be improved greatly under the condition of weak signal. Keywords: B1C signal, weighted joint acquisition algorithm, weighted coefficient.