Sensing and communication integrated system based on mobile communication signal

An integrated sensing and communication system based on a mobile communication signal, wherein the following modules are newly added to a sending end and a receiving end of each node in the system, which comprise:

• a synchronization sequence embedding module provided at the sending end, which is configured for embedding a primary synchronization sequence and a secondary synchronization sequence into a radio frequency signal to be sent and then outputting the radio frequency signal to a digital modulation module, wherein, the synchronization sequence embedding module embeds a same primary synchronization sequence into a second CP-OFDM symbol and an eighth CP-OFDM symbol of one subframe, and embeds a same secondary synchronization sequence into a fourth CP-OFDM symbol and a tenth CP-OFDM symbol of one subframe;
• and CP-OFDM represents variable cyclic prefix orthogonal frequency division multiplexing;
• a primary synchronization sequence-assisted ranging accuracy improvement algorithm module and a secondary synchronization sequence-assisted speed measurement accuracy improvement algorithm module provided at the receiving end, wherein a receiving sequence output by a parallel-to-serial conversion module at the receiving end is input into a two-dimensional range-Doppler radar processing algorithm module, the primary synchronization sequence-assisted ranging accuracy improvement algorithm module and the secondary synchronization sequence-assisted speed measurement accuracy improvement algorithm module respectively;
• and wherein the primary synchronization sequence-assisted ranging accuracy improvement algorithm module compensates for a target node range RangeOFDM output by the two-dimensional range-Doppler radar processing algorithm module, and the secondary synchronization sequence-assisted speed measurement accuracy improvement algorithm module compensates for a target node speed VOFDM output by the two-dimensional range-Doppler radar processing algorithm module;
• wherein the primary synchronization sequence-assisted ranging accuracy improvement algorithm module performs the following operations for N adjacent subframes in the receiving sequence respectively:
• performing an autocorrelation operation on a subframe in the receiving sequence and a corresponding subframe in a local sequence to calculate a corresponding target node range, where N≥2;
• calculating an average value of differences between the calculated N target node ranges Rangeu and the RangeOFDM to obtain a compensation amount for ranging error ΔRange;
• compensating for the RangeOFDM;
• where u=1,2, . . . N;
• wherein the secondary synchronization sequence-assisted speed measurement accuracy improvement algorithm module performs the following operations for M adjacent subframes in the receiving sequence respectively:
• performing a correlation operation on a fourth CP-OFDM symbol and a tenth CP-OFDM symbol in a subframe to obtain a correlation result;
• obtaining a Doppler frequency shift Dopplerv of a target node from the correlation result, where v=1,2, . . . M, M≥2;
• calculating a Doppler frequency shift DopplerOFDM according to the target node speed VOFDM output by the two-dimensional range-Doppler radar processing algorithm module, and then calculating an average value of differences between M Doppler frequency shifts Dopplerv and the DopplerOFDM to obtain a compensation amount for Doppler frequency shift error ΔDoppler;
• compensating for the DopplerOFDM;
• and calculating a compensated target node speed according to the compensated Doppler frequency shift.