CAJ | 학술논문

为了提高相位式测距仪的测量精度，采用移相相关方法来估计两同频正弦信号的相位差。首先将每路信号移相2π后和原信号做相关来计算自相关，以减少噪声的影响；其次用少许数据初步估算相位差，并将一路信号移相，使两路信号的相位差移到π/2（或3π/2）附近；然后用较多的采样数据计算两路信号的相位差，将结果再减去移相量得到最终的相位差。同时分析了频率误差对相位差计算精度的影响，进行了理论分析和仿真实验验证。结果表明，该方法计算的误差大大减小。这对提高测距仪的测量精度是有帮助的。
위료제고상위식측거의적측량정도，채용이상상관방법래고계량동빈정현신호적상위차。수선장매로신호이상2π후화원신호주상관래계산자상관，이감소조성적영향；기차용소허수거초보고산상위차，병장일로신호이상，사량로신호적상위차이도π/2（혹3π/2）부근；연후용교다적채양수거계산량로신호적상위차，장결과재감거이상량득도최종적상위차。동시분석료빈솔오차대상위차계산정도적영향，진행료이론분석화방진실험험증。결과표명，해방법계산적오차대대감소。저대제고측거의적측량정도시유방조적。
In order to improve the accuracy of a phase-shift range finder , a phase-difference algorithm based on phase-shift correlation analysis was proposed to estimate the phase-difference between two sinusoidal signals with same frequency .For reducing the influence of noise , the autocorrelation between the original and 2πshifted signal was calculated firstly.Secondly, the phase difference was estimated approximately with a few sampled data and the initial phase of one signal was shifted by Δθto make the phase difference between two signals to be near π/2(or 3π/2).Then, the phase-difference was calculated with whole set of data by correlation method and the final phase difference was obtained by subtracting Δθ.The influence of frequency error was analyzed .Theoretical analysis and simulation shows that the error of this method is greatly reduced .The proposed method can improve the accuracy of a range finder .