Digital level bar code ruler coding method and measuring instrument

The invention relates to the technical field of surveying and mapping instrument manufacturing, in particular to a digital level bar code ruler coding method and a measuring instrument, black and white bar codes are sequentially arranged at intervals, and the black and white bar codes respectively have various widths; wherein the black bar code is an information code, the white bar code is an interval code, the information code is arranged in a pseudo-random sequence, and the combination arrangement mode of the information code is unique; information codes with various widths are divided into a cluster A and a cluster B. The information codes with different widths are clustered into the cluster A and the cluster B, and the information codes of the cluster A and the cluster B are coded by adopting one primitive polynomial in a seven-order M sequence, so that the identification difficulty and the bit error rate are reduced; meanwhile, only one coding sequence is adopted, but a plurality of coding verification m