联合菲涅耳变换相关器相关性能研究

Research on Correlation Performance of Joint Fresnel Transform Correlator

使用纯相位空间光调制器编码线性相位掩模,实现了联合菲涅耳变换相关器。为分析空间光调制器相位调制误差对相关器相关性能的影响,数值模拟了不同相位调制误差下的相关输出,结果表明相位调制误差越大,相关器相关峰值越低,且相关峰半高宽越大。与双光楔联合菲涅耳变换相关器进行了实验对比,由于空间光调制器的相位调制精度低于光楔器件,实验结果表明双光楔联合菲涅耳变换相关器具有更高的相关峰值和更小的半高宽,与数值模拟结果相符。

Joint Fresnel transform correlator was achieved with a phase-only spatial light modulator encoding linear phase mask.To analyze the influence of the phase modulation error of the phase-only spatial light modulator on the correlation performance of the correlator,correlation output with different phase modulation error was numerically simulated.Simulation results show that the larger the phase modulation error is,the lower the correlation peak value is and the larger the full width at half maximum of the correlation peak is.Compared with the double optical wedges joint Fresnel transform correlator,experimental results show that the double optical wedges joint Fresnel transform correlator has higher correlation peak value and smaller full width at half maximum,which is consistent with the simulation result.