Abstract:High bit A/D quantization is used in the interference suppression technology, while the low bit A/D quantization is applied in the existing global navigation satellite system (GNSS) receivers, so different number of A/D quantization bits should be applied before and after the anti-interference process. In order not to change the existing structure of the GNSS receiver, it is necessary to study how to convert the high bit digital signal into low bit digital signal. Aiming at the signal-to-noise ratio (SNR) loss caused by re-quantization, this paper proposes a re-quantization method based on adaptive thresholds. High bit intermediate frequency digital signal re-quantized according to the adaptive thresholds, and the adaptive thresholds are adjusted by the best probability distribution, which is the Gaussian distribution, of the low bit quantitative results. According to theoretical analysis and simulation, the new method has less re-quantization loss compared with the traditional interception method. Also, the simulation of GNSS signal acquisition using the new re-quantization method demonstrates that the method is actually possible and reliable.