Research On Communication Ranging System Based On Parallel Combinatory Spread Spectrum

In many communication application scenarios,both sides of communication need to complete the function of ranging while completing the communication function.Integration technique of communication ranging can accomplish the dual tasks of communication and ranging for some targets simultaneously on the premise of using the same wireless equipment.Compared with the system with two sets of equipment which respectively complete their own function,this technique reduces the complexity of the system and the power consumption of the equipment to a certain extent and improves the utilization of the communication equipment.In the fields of satellite positioning and navigation,deep space exploration,and inter-satellite link communication,the integration technique of communication ranging is the key direction of development.Therefore,it is of great significance to study and improve the performance of the integration technique of communication ranging to further improve the utilization of communication equipment and the performance of communication ranging system.This paper firstly introduces the theory of spread spectrum communication ranging system and parallel combinatory spread spectrum communication technology and verify the availability of cyclic-shifted sequence information by simulation,which can be used as the basis for the selection of improved communication ranging composite system model transmission sequences.Combined with parallel combinatory spread spectrum communication technology,the model of parallel combinatory spread spectrum communication ranging system based on cyclic-shifted sequences has been proposed.Compared with the traditional communication ranging model,the advantages of the new model are illustrated and its feasibility is verified by simulation.For the time-marking scheme,two kinds of marking methods,relative time method and absolute time method have been proposed,and the merits and drawbacks of these two time-marking methods are investigated by comparative analysis.This paper also analyzes the performance of the new communication ranging system,studies the range measurement error sources of the new model and analyzes the influence of the stability and temperature coefficient of clock source,the effect of acquisition algorithm,multi-path interference,doppler frequency shift and other aspects on the distance measurement performance,which lays a good foundation for optimizing the performance of communication ranging system.In terms of the capture algorithm,an improved scheme of fast capture is proposed to reduce the capture time.Aiming at the ranging error caused by sequence misjudgment,the parallel combinatory spread spectrum communication ranging system based on sequence information constraint is proposed by taking advantage of the information amount of parallel combinatory spread spectrum sequences,which is divided into information constraints method in a sequence and information constraints method between sequences,and the different mapping relations and arithmetic structures are analyzed.Finally,the effectiveness and feasibility of the improved communication ranging system are verified by simulation.