LoRa scattering communication system based on DDS

The invention discloses a LORA scattering communication system based on DDS. The system comprises a digital baseband processor, a radio-frequency switch, an impedance matching circuit and an antenna,wherein the control end of the radio-frequency switch is connected with the output end of the digital baseband processor, one switch connecting end is connected with the antenna, and the impedance matching circuit is connected between the other switch connecting end and the ground in series; and the digital baseband processor is used for carrying out Whitenning scrambling, Hamming error correctioncoding, Interleaving and De-Gray coding on LoRa data frames according to LORA protocol specifications through programming or a digital logic circuit, carrying out CSS linear frequency modulation on obtained Symbols by adopting the DDS method to obtain digital square wave signals and sequentially sending the digital square wave signals to the radio-frequency switch; and the radio-frequency switchis used for controlling on