A joint detection method of cycle-identification for loran-C signal

Abstract

The stability and accuracy of the whole receiving system is affected by the cycle-identification in the Loran-C receivers. In this paper, aiming disadvantages of the current techniques for cycle-identification, on the basis of using the linear digital average to improve the signal to noise ratio, the signal is detected by using the joint detection method of peak-peak ratio detection and polarity decision. The validity of the proposed method is verified by simulating, and the noise tolerance is analyzed. Finally, the method is verified by the Loran-C receiver. The results show that, when the signal to SNR is greater than 15dB, the joint detection method can accurately detect the standard zero, and the cycle-identification accuracy is better than 0.1us. The joint detection method is reasonable and reliable, and it can lay the foundation for the high precision timing and time delay measurement of the modern digital Lo-ran-C receivers.