Design of a Baseband Signal Generator in Navigation Satellite Signal Simulators

Tianlong SONG  Qing CHANG  Wei QI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E95-B   No.2   pp.680-683
Publication Date: 2012/02/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.680
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Navigation, Guidance and Control Systems
Keyword: 
navigation satellite signal simulator,  baseband signal generation,  shaping filtering,  virtual sampling rate,  phase jitter,  look-up table,  high-precision,  

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Summary: 
To improve simulation precision, the signal model of navigation satellite signal simulators is illustrated, and the generation mechanism and evaluation criteria of an important error source-phase jitter in baseband signal generation, are studied subsequently. An improved baseband signal generator based on dual-ROM look-up table structure is designed with the application of a newly-established concept-virtual sampling rate. Pre-storage of typical baseband signal data and sampling rate conversion adaptive to Doppler frequency shifts are adopted to achieve the high-precision simulation of baseband signals. Performance analysis of the proposed baseband signal generator demonstrates that it can successfully suppress phase jitter and has better spectral performance, generating high-precision baseband signals, which paves the way to improving the overall precision of navigation satellite signal simulators.