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一、引言考斯特(costas)环在通信系统中,作为两相制移相键控信号的解调和基准载波的提取环路,已经得到成功的应用。在低输入信噪比的情况下,平方环和考斯特环都具有最佳性能,在输入信噪比较高的情况下,考斯特环的环路信噪比比平方环约高出3db。在国外,考斯特环在干涉仪中也得到了成功的应用,而国内尚没有加以应用。分析表明,考斯特环在干涉仪中应用,也具有优越的性能。本文对考斯特环在干涉仪中的应用加以简单介绍,并对其主要性能进行了初步的理论分析。
I. INTRODUCTION Costas ring has been successfully applied in the communication system as the demodulation of two phase phase shift keying signal and the extraction of reference carrier. In the case of low input signal-to-noise ratio, the square loop and the Coster loop have the best performance. In the case of high input signal-to-noise ratio, the loop SNR of the cosst loop is about 3db higher than the square loop. In other countries, Coster ring has been successfully applied in interferometer, but it has not been applied domestically. Analysis shows that the Coaster ring is used in the interferometer, but also has superior performance. In this paper, the application of Coaster ring in interferometer is briefly introduced, and the primary theoretical analysis of its main performance is carried out.