• FAST ACQUISITION ALGORITHM FOR HYBRID DS/FH RECEIVER

      Bo, Zhang; Yixun, Ren; Dongkai, Yang; Qishan, Zhang; BeiHang University; TT&C and Telecommunication Institute (International Foundation for Telemetering, 2007-10)
      This paper introduced a fast scanning and waiting acquisition method for a DS/FH receiver used in the telemetry field. Mathematic model of the hybrid DS/FH system’s acquisition process is given and discussed. The average acquisition time expression using this method and generalized average acquisition time formula is derived also. The validity of the proposed algorithm is verified after simulation. In the circumstances of Additive Gauss White Noise for the channel, simulation result at Ec/N0= -15dB shows that the average acquisition time is decreased almost 4 times than that of waiting and searching method.
    • STUDY ON GPS RECEIVER ALGORITHMS FOR SUPPRESSION OF NARROWBAND INTERFERENCE

      Yongkang, Hu; Qishan, Zhang; Yanhong, Kou; Dongkai, Yang; Beihang University (International Foundation for Telemetering, 2007-10)
      Despite the inherent resistance to narrowband signal interference afforded by GPS spread spectrum modulation, the low level of GPS signals makes them susceptible to narrowband interference. This paper discusses the application of a pre-correlation adaptive temporal filter for stationary and nonstationary narrowband interference suppression. Various adaptive algorithms are studied and implemented. Comparison of the convergence and tracking behavior of various algorithms is made.
    • TELEMETRY TRANSCEIVER DESIGN USING BOC SIGNAL

      Dongkai, Yang; Li, Du; Qishan, Zhang; Beihang University (International Foundation for Telemetering, 2007-10)
      This paper focuses on the transceiver design using BOC signal in the telemetry field, including the transmitter and receiver. The transmitter is similar as that using BPSK except from the sub-carrier modulation. But the receiver design is totally different because the BOC signal has different performance. The acquisition methods of BOC signal have been discussed such as the single-side BPSK-like, double-sides BPSK-like and hybrid processing methods, which can restrain side-peak and eliminate ambiguities. The three acquisition process principles and their performances include arithmetic complexity are described, compared and simulated using MATLAB.