In the implementation of forward deception jamming, the transmitted jamming signal and the direct signal enter the jammed receiver at the same time, which has a complex impact on the signal processing process of the receiver. According to the size of the signal power, the jamming effect of repeater jamming may appear signal suppression, signal deception or no deception and so on. At present, there is no quantitative research on the power control of repeater jamming signal. In order to promote the practical application of repeater deception jamming in Navigation Warfare and formulate the appropriate power control strategy of repeater deception jamming, the paper initially establishes the carrier to noise ratio estimation model of direct signal and repeater signal in the presence of repeater jamming, and uses the actual repeater equipment and receiver to calibrate the relevant parameters in the model, and finally analyzes the interference by using the calibrated model The relationship between jamming power and the distance of repeater deception jamming. The experimental results show that the results of the model are in good agreement with the actual situation, which can be used as the basis for making forward deception jamming strategy.