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对联合变换相关器的功率谱进行对数变换可强化其高频分量,锐化相关峰,但同时也会增强其噪声成分,影响抗噪性能。针对这一问题,提出了一种改进的对数联合变换相关器模型。通过改变对数函数形式来提高对数联合变换相关器的抗噪能力。计算机仿真结果表明,在附加高斯白噪声、非重叠低频和高频有色噪声的条件下,改进的对数联合变换相关器的抗噪能力均优于传统的对数联合变换相关器。
Logarithmic transform of the power spectrum of the joint transform correlator can enhance its high frequency components and sharpen the correlation peaks, but also enhance the noise components and affect the anti-noise performance. To solve this problem, an improved logarithmic joint transform correlator model is proposed. By changing the logarithmic function form to improve the anti-noise ability of logarithmic joint transform correlator. Computer simulation results show that the improved logarithmic joint transform correlator has better anti-noise ability than the traditional logarithmic joint transform correlator with additional Gaussian white noise, non-overlapping low frequency and high frequency colored noise.