小型舰艇高精度辅助定位无线电探测系统

发布时间：2018-04-15 14:38

本文选题：小型舰船定位 + 阵列测向　；参考：《电子器件》2017年04期

【摘要】：针对海面小型舰船GPS定位信号易受干扰和安全性差的问题,设计了一套VHF无线电辅助定位测向系统。系统采用5元均匀线性阵列接收舰船的脉冲应答信号,利用FPGA硬件处理模块快速实现基于多重信号分类(MUSIC)算法的超分辨测向测距,其中特征向量分解(EVD)模块采用Jacobi快速迭代算法,达到ms级响应速度;校准模块采用仅需移位加法运算的坐标旋转数字计算机(CORDIC),不仅节约了硬件计算资源,还减少了阵列误差对测向结果的影响,有效提高了系统测向精度。通过与浮动目标建立了基于时分多址(TDMA)的通信机制,能够以软件方式自适应改变工作频段和工作时间,大大增强了抗干扰能力强。测试结果表明:系统测距偏差在15 m以内,在阵列正前方±40°夹角内时测向偏差能够保持在3°以内,能够快速有效的获知目标方位距离信息,为小型舰船在复杂干扰环境下的高精度定位提供了一种有效辅助测量手段。
[Abstract]:Aiming at the problem that the GPS positioning signal of small ship on the sea is vulnerable to interference and poor safety, a set of VHF radio assisted positioning and direction finding system is designed.The system adopts a 5-element uniform linear array to receive the pulse response signal from a ship, and uses the FPGA hardware processing module to quickly realize the super-resolution direction finding and ranging based on the multi-signal classification algorithm.The eigenvector decomposition EVD module adopts Jacobi fast iterative algorithm to achieve the response speed of Ms level, and the calibration module adopts the coordinate rotated digital computer Cordic, which only needs shift addition operation, which not only saves the hardware computing resources, but also saves the hardware computing resources.The effect of array error on the direction finding result is reduced, and the precision of direction finding is improved effectively.The communication mechanism based on TDMA) is established with floating target, which can adaptively change the working frequency band and working time by software, and greatly enhance the anti-jamming ability.The test results show that the ranging deviation of the system is less than 15 m, and the direction finding deviation can be kept within 3 掳in the 卤40 掳angle in front of the array, and the azimuth distance information of the target can be obtained quickly and effectively.It provides an effective auxiliary measurement method for high precision positioning of small ships in complex jamming environment.
【作者单位】：河南工程学院计算机学院;
【基金】：国家自然科学基金项目(61379079)
【分类号】：TN014;TN791;U674.703.4

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