PPM decoding method of high-frequency label

The invention discloses a pulse position modulation (PPM) decoding method of a high-frequency label. The decoding method comprises the following steps: detecting a start of frame delimiter (SOF) of an issued command of a card reader, measuring a high level length between two pulses of the SOF, and then subtracting the standard by the measured high level length to obtain an error value Delta, firstly compensating the error value Delta in decoding, and then performing the decoding. 本发明公开了种高频标签的脉冲位置调制(PPM)解码方法，包括：通过检测读卡器下发命令的帧起始标志(SOF)，对SOF两个脉冲之间的高电平长度进行测量，然后将测量所得高电平长度与标准长度相减，得到误差值Δ，在解码时，先补偿该误差值Δ，然后进行解码。