| At present,the communication platforms in the military field are moving towards the Integration of Reconnaissance,Interference,Detection and Communications(IRIDC)and the communication technology in civilian areas is also pursuing the functional software and reconfigurability of communication systems.Software Defined Radio(SDR)is playing an increasingly important role in these areas.Current software defined radio researches,which focus on combining software defined radio platforms with the various specific communications applications,enables various functions through software that were originally implemented primarily through hardware.Although multiple functions are implemented on the same platform,the research on hot handoff and parallelism between multiple functions is relatively inadequate and the advantages of software defined radio are not fully developed.Therefore,carrying out the research of application integration on software defined radio platforms has important theoretical and practical significance for further exerting the utility of the platforms and the integrated advantages of function modules.This paper addresses the need of detection-communication integration and studies on the parallel mechanism of multiple tasks on the software radio platform.The main work and innovation include:(1)Design and implementation of multi-task management framework based on the software defined radio platform.This paper analyzed the structure of the integration of detection and communication based on software defined radio platforms,summarizes various applications such as detection and communication as tasks,studies the characteristics and mechanisms of various tasks on software defined radio platforms.Based on this,this paper proposed the multitasking management framework where various tasks can be regarded as sub-tasks and finally designed and implemented the framework.The framework can realize the simultaneous concurrency,polling-based concurrency and event-based concurrency of multiple tasks.The framework can integrate all kinds of existing independent software defined radio applications and realize the paralleling and data sharing of multiple modules in one platform,making a number of tasks to become an organically cooperative whole.(2)Design and implementation of the testbed for testing blind rendezvous algorithms based on software defined radio platforms.This paper analyzes in detail the influencing factors of channel rendezvous success rate and time performance on the software defined radio platform,observes the situation of "switching blanking period" during the channel rendezvous process based on the software defined radio platform,puts forward countermeasures,designs and implements the testbed for blind rendezvous algorithms.At the distributed nodes,the testbed runs independently with the channel hopping sequence determined by the considered algorithm as input.Finally,the detailed information about the time to rendezvous,the rendezvoused channel and the whole process of the rendezvousing are given.Thus,it provides basis for analyzing the algorithm.Experiments are conducted on GNU Radio and USRP,and the experimental results show that the testbed has fine performance and extends the means of simulation and analysis of rendezvous algorithms which previously were mainly software method,laying a foundation for the rendezvousing and networking on the software defined radio platform.Based on the above research results,a detection-communication system based on software defined radio platforms is designed and implemented to solve the problem of paralleling and hot switching among multiple task modules.In the software defined radio platform,real-time detection of available channels and channel rendezvous are combined to test the platform,and the results show that the system can well accomplish the mission of detection-communication integration. |
