GPS导航空时联合抗干扰快速算法设计与实现

发布时间：2018-03-22 09:36

本文选题：导航抗干扰　切入点：空时二维处理　出处：《南京理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：全球卫星导航系统(GPS)卫星距离地面较远,地面接收机收到的功率较小,极易受压制式干扰而无法正常工作,本文以某四阵元GPS导航抗压制式干扰接收机课题为背景,开展了空时联合自适应抗干扰快速实现算法设计与硬件实现工作。首先,本文针对四阵元方阵天线,根据阵列接收信号模型,完成了 GPS卫星信号和压制式干扰的建模;针对GPS卫星信号来向未知场景,本文在传统功率倒置算法基础上,设计了一种空时二维抗干扰快速实现算法,算法运算量减小为改进前的三分之一;分析了算法的抗干扰性能,评估了时延抽头数、采样快拍数和干扰来向对算法性能的影响。其次,开展了中频抗干扰接收机硬件设计与算法软件实现工作。完成了基于FPGA+DSP架构的中频抗干扰接收机原理图设计、PCB设计和硬件电路调试,根据抗干扰算法架构,完成了 FPGA和DSP信号处理任务分工,其中FPGA主要完成四通道数字下变频、协方差矩阵估算和波束形成处理,DSP主要完成基于功率倒置快速算法的权重计算,本文通过对FPGA软件设计进行优化,提高了片内资源的复用率,通过对FPGA程序的时序优化,提高了软件的稳定性,通过对DSP权重计算的汇编优化,提高了算法的实时性。当空时联合抗干扰算法采用四个阵元与四个时延抽头进行权重计算时,权重更新时间低于0.85ms。最后,本文在室内GPS中频干扰模拟器上完成了中频抗干扰模块干扰抑制性能测试,在外场干扰环境下完成了四阵元GPS导航抗压制式干扰接收机的搜星效果测试,验证了算法的最大干扰抑制性能。
[Abstract]:Global navigation satellite system (GPS) satellite ground distance is far, the smaller power ground receivers, vulnerable to jamming and can not work normally, based on a four element GPS navigation anti jamming receiver subject as background, the space-time adaptive anti interference algorithm to achieve rapid design and hardware implementation of the work first, according to the four element array antenna, according to the array signal model, completed the GPS satellite signal and suppress jamming for modeling; GPS satellite signal to the unknown scene, based on the traditional power inversion algorithm, designed an anti-jamming space-time fast algorithm, the computational algorithm is reduced in order to improve the anti-jamming performance before 1/3; algorithm analysis, evaluation of the delay tap number, sampling snapshots and interference to affect the performance of the algorithm. Secondly, if carried out anti dry Disturbance receiver hardware design and algorithm software. If completed based on FPGA+DSP anti-jamming receiver principle diagram design, PCB design and debugging of the hardware circuit, according to the anti-jamming algorithm architecture, the completion of the FPGA and DSP signal processing tasks, the main FPGA complete four channel digital down conversion, covariance matrix estimation and beamforming DSP mainly completes the calculation of weight, power inversion based on rapid algorithm, based on FPGA software to optimize the design, improve the reuse rate of on-chip resources, through the timing optimization of the FPGA program, to improve the stability of the software, through the assembly optimization calculation of the weight of DSP, improved the real-time performance of the algorithm in the sky. Anti jamming algorithm using four antennas and four delay tap weight calculation, the weight update time is less than 0.85ms., the indoor GPS interference The interference suppression performance test of the intermediate frequency anti-jamming module has been completed on the simulator. Under the external field interference environment, we have completed the search effect test of the four element GPS navigation anti jamming jamming receiver, and verified the maximum interference suppression performance of the algorithm.

【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P228.4

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