距离无关的高精度混沌激光测距

Range Finding with Chaotic Laser with High Resolution Non-Affected by Ranging Distance

研究了利用类噪声混沌激光的相关特性实现目标距离的测定方法。数值分析了混沌激光自相关曲线的半峰全宽和旁瓣水平与表征其混沌状态的最大李雅普诺夫指数及关联维数的关系。同时,模拟研究了波形误差对混沌激光测距的影响,并分析了不同混沌态的波形误差的临界值。结果表明,具有窄半峰全宽和低旁瓣水平的自相关曲线的高维混沌激光序列是理想的测距激光,其测量分辨率可达1．5 cm以下,且波形误差容忍度大,测量范围大。在测量范围内,精度与距离无关。

Range finding with chaotic laser train generated from semiconductor lasers with optical feedback is investigated. Both full-width-half-maximum and low peak sidelobe level of cross-correlation trace related to chaotic waveform characterized with the largest lyapunov exponent and correlation dimension are studied numerically to select an ideal chaotic light used to find distance. The influences on range finding of the probe signal waveform error due to attenuation and additive noise are presented to find the critical operation condition. Simultaneously, the critical operation condition related to different chaotic state with different peak sidelobe level of autocorrelation trace is demonstrated. Simulated results show that ideal chaotic laser source should have high dimension, low peak sidelobe level and narrow full-width-half-maximum for ranging with large tolerance of waveform error and high resolution with 1.5cm range non-affected by distance.