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Volume 31 Issue 12
Dec.  2005
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Journal of Beijing University of Aeronautics and Astronautics  > 2005  >  31(12): 1308-1311.
Jie Wei, Xie Junkai, Xi Hongyu, et al. Genetic Algorithms and Its Application in Software Test Data Generation[J]. Journal of Beijing University of Aeronautics and Astronautics, 1998, 24(4): 434-437. (in Chinese)
Citation: Zhu Yuhong, Zhang Qishan, Chang Qinet al. Design of a algorithm of mapping from phase to sine amplitude in DDS of a GPS signal simulator system[J]. Journal of Beijing University of Aeronautics and Astronautics, 2005, 31(12): 1308-1311. (in Chinese)
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Design of a algorithm of mapping from phase to sine amplitude in DDS of a GPS signal simulator system

  • School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

  • Received Date: 17 Sep 2004
  • Publish Date: 31 Dec 2005
    Abstract
  • Based on trigonometric identities, Sunderland technique is a effective compression algorithm for mapping from phase to sine amplitude in ROM-based direct digital frequency synthesizers(DDS)design. A modification based on Taylor-series linear interpolation method was proposed to provide additional improvements in compression efficiency. Their effect on distortion and trade-offs were investigated, and spurious were identified by using fast Fourier transform algorithm (FFT). A computer program was created to simulate and optimize the effects of the memory compression and algorithmic techniques on the output spectrum of the DDS with the help of matlab computing tool. The subjected multiplierless architecture was then implemented in a Xilinx’s field programmable gate array (FPGA). Simulation results show that the proposed techniques is effective, and the digital output of the designed DDS which using this compression technique has the worst case spurious about -90 dB. A 80 MHz DDS was developed and used successfully in a actual projects of a GPS signal simulator system.

     

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  • [1] Sunderland D A, Strauch R A, Wharfield S S, et al. COMS/SOS frequency synthesizer LSI circuit for spread spectrum communications[J]. IEEE Journal of Solid-State Circuits, 1984,19(4):497~506 [2] Nicholas H T, Samueli H, Kim B. The optimization of direct digital frequency synthesizer performance in the presence of finite word length effects . Proceedings of the 42nd Annual Freq Control Symp . Monmouth NJ:USERACOM, Ft,1988.357~363 [3] Bellaouar A, O'brecht M S, Fahim A M. Low-power direct digital frequency synthesis for wireless communications[J]. IEEE Journal of Solid-State Circuits, 2000,35(3):385~390 [4] Sodagar A M, Lahiji G R. Mapping from phase to sine-amplitude in direct digital frequency synthesizers using parabolic approximation[J]. IEEE Trans Circuits Syst Ⅱ, 2000,47:1452~1457 [5] 陆 娟,常 青,张其善,等. 十二通道GPS信号发生器方案研究[J]. 北京航空航天大学学报, 2003,29(4):331~334 Lu Juan, Chang Qing, Zhang Qishang, et al. Design of a twelve-channel digital GPS simulation system[J]. Journal of Beijing University of Aeronautics and Astronautics,2003,29(4):331~334(in Chinese) [6] Kroupa V F. Synthesis techniquues . Derect Digital Frequency Synthesizers, A Selected Reprint Volume . New York:Institate of Electical and Electronics Engineers,1999.3~13
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