Effects of Continuous Wave Interference on Pseudorandom Code Tracking Error under Large Error Conditions
Funds:
The National Natural Science Foundation of China (61201031)
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摘要: 單頻干擾能夠引起較大的偽碼跟蹤誤差，基于小誤差條件的跟蹤誤差分析會(huì)失效。在大誤差條件下，由于碼環(huán)鑒相器不再工作在線性區(qū)域，利用鑒相器輸出的二階泰勒展開式代替一階線性化近似，該文給出了單頻干擾下偽碼跟蹤誤差的解析表達(dá)式。通過數(shù)值分析和仿真實(shí)驗(yàn)分析驗(yàn)證了在單頻干擾下偽碼跟蹤誤差隨干擾起始相位、干擾頻率和干信比的變化特性。結(jié)果表明：當(dāng)干擾引起的偽碼跟蹤誤差較大時(shí)，基于鑒相器線性化的理論預(yù)測的準(zhǔn)確性顯著下降，而基于鑒相器二階泰勒近似的理論分析能夠準(zhǔn)確預(yù)測大誤差條件下的偽碼跟蹤誤差，在跟蹤誤差不超過0.34 chip時(shí)，理論分析誤差不超過20%。Abstract: Continuous Wave Interference (CWI) can induce large code tracking error, and the tracking error analysis based on small error conditions becomes invalid. Under large error conditions, since code loop discriminator is no longer working in the linear region, the second-order Taylor series expansion of discriminator output is introduced instead of linear approximation, and analytical expressions of the tracking error in the presence of CWI are derived. Numerical analysis and simulation results are presented to evaluate the code tracking error with different initial phases，interference frequencies and interference-to-signal power ratio (ISR). The experimental results show that, when the code tracking error induced by CWI is large, the prediction accuracy of theoretical analysis based on linearized discriminator decreases noticeable, while the new theoretical expressions based on second-order Taylor series expansion provide accurate predictions of code tracking errors under large error conditions. If the code tracking error is smaller than 0.34 chip, the theoretical prediction error is no more than 20%.
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