Research On Communication Ranging System Based On MC-DS-CDMA

Communication and ranging are two functions that are widely used in modern engineering.However,due to the limitations of the communication environment and equipment,equipment that carries both communication and ranging functions at the same time becomes a burden,so the integrated communication and ranging system should be applied.Born.Compared with the traditional communication and ranging systems,the integrated communication and ranging system reduces system usage and power consumption,and realizes "one device with multiple functions";and this dissertation uses Multi-Carrier Direct Spread Code Division Multiple Access(Multi-Carrier Direct).Sequence Code Division Multiple Access(MC-DS-CDMA)system is the research basis,and a new communication ranging model is proposed to meet the needs of multiple scenarios and adapt to a wider or complex communication environment.It can be used in the fields of interstellar navigation and communication.Wider application prospects.The main research work of this dissertation:Studies the relevant theories of the MC-DS-CDMA system and the parallel combined spread spectrum communication system.It uses the shift sequence to mark the clock-the phase marking method,and realizes the ranging by marking the residence time of the receiving end,and through the computer The simulation verifies the feasibility of the phase marking method.This dissertation analyzes the correlation characteristics of different spreading sequences and the number of generated sequences.Since the spreading sequence in the zero-correlation zone has the advantages of a large number of sequences and good correlation in the correlation zone,it is suitable for use in the communication ranging model,and the simulation verifies that the system is effective Sex.This dissertation proposes two resident clock marking schemes: absolute time marking method and relative time marking method.In the simulation analysis,the absolute time marking method is more flexible and the relative time method is more stable when the two parties communicate.This dissertation proposes three communication ranging models for different scenarios,analyzes the communication mode and ranging plan of each model,establishes the corresponding clock mark model,and simulates and analyzes the error source of the ranging model and the corresponding solutions.This dissertation systematically analyzes the impact of environment and parameters on the entire system,including the crystal oscillator error caused by the temperature and time drift coefficient of the base station clock crystal oscillator,the delay error in the sequence sending and receiving process,and the shift sequence mark residence time to realize the ranging solution.The quantization error,and the phase error in the capture process and other factors.At the end of this dissertation,the pseudo-code period is estimated by the second spectrum method to determine the initial sampling time point;the acquisition algorithm is improved to improve the acquisition efficiency and reduce the influence of multipath and Doppler frequency shift on the system.Computer simulation experiments show that the new communication ranging system model improves the ranging accuracy and expands the scope of application compared with the traditional communication ranging system.