Two-channel checking circuit and method based on discrete magnitude signal

The invention relates to a two-channel checking circuit and method based on a discrete magnitude signal. The two-channel checking circuit comprises a first channel, a second channel, a corresponding position comparing unit and a redundant register, wherein the first channel and the second channel are parallel. The first channel comprises a first discrete magnitude processing circuit and a second data register, wherein the first discrete magnitude processing circuit and the second data register are sequentially connected. The second channel comprises a second discrete magnitude processing circuit and a second data register, wherein the second discrete magnitude processing circuit and the second data register are sequentially connected. The discrete magnitude signal simultaneously enter the first discrete magnitude processing circuit and the second discrete magnitude processing circuit, the output end of the first data register and the output end of the second data register are both connected with the input end of the corresponding position comparing unit, and the output end of the corresponding position comparing unit is connected with the redundant register. The technical problems that an existing discrete magnitude signal processing method cannot really reflect the state of a signal and credibility of a data output result is not high are solved, and the aim of improving signal credibility through two-channel processing of the discrete magnitude signal is achieved.