一种新型的塔康方位角估算方法  

A Novel Algorithm of Azimuth Estimation for TACAN System

作　　者：马雅男 唐小峰 邹建 徐卫 刘道煦 MA Ya-nan;TANG Xiao-feng;ZOU Jian;XU Wei;LIU Dao-xu(Chengdu Spaceon T&C Technology Co.,Ltd.,Chengdu 611731,China)

机构地区：[1]成都天奥测控技术有限公司,四川成都611731

出　　处：《测控技术》2022年第4期54-59,共6页Measurement & Control Technology

基　　金：装备发展部测试仪器科研项目(2009ZCHZ0004)。

摘　　要：塔康作为近程无线电导航系统,为飞机提供与地面台的距离和方位角度等信息,但由于硬件工艺、环境等限制,其测量精度极易受到噪声的影响。针对这一问题,提出了一种新型的方位角估算方法。该方法在最小二乘法的基础上,创新性地增加了误差检测功能和拟合数据反馈的功能,通过误差检测功能去除超过误差门限范围的接收数据,再利用平均后的拟合数据反相替代去除的数据,将整合后的数据用于最小二乘计算,得到更精确的方位角度。利用新方法,在SNR为23 dB、基准角为35°的仿真条件下,得到方位角为35.25°,相比于最小二乘法的测试结果误差降低了0.54°。随后,在基准角为35°~305°、SNR为13~38 dB(以5 dB为间隔取值)的6种测试环境下进行验证,新算法较最小二乘法测量精度提升了10%~90%,进一步表明了新算法的普适性。最后,新算法经过FPGA在硬件平台进行测试,其方位角相比于最小二乘法测量结果误差降低了1.6°,为后续塔康系统性能的提升起到了推动作用。As a short-range radio navigation system, TACAN provides the aircraft with the distance and azimuth information of the ground station.However, due to the limitations of hardware technology and environment, the measurement accuracy is easily affected by noise.To solve this problem, a novel algorithm of azimuth calculation is proposed.Based on the least square algorithm, the error detection module and fitting data feedback module are added.The error detection module is used to eliminate the received data exceeding the error threshold.Then, the average fitting data is calculated to replace the removed data.At last, the azimuth angle can be obtained accurately by using this integrated data.Utilizing this new structure, the detected azimuth about 35.25° is obtain which is 0.54° lower than the test data using the least square algorithm with SNR at 23 dB and reference angle 35°.Then, compared with the test data utilizing the least square algorithm, the measurement accuracy of azimuth is increased by 10% to 90% with the help of the new structure at the SNR from 13 dB to 38 dB and azimuth from 35° to 305°.At last, the new algorithm is tested on the hardware platform by FPGA.The error is reduced by 1.6°compared with the measurement result of the least square method, which plays a role in promoting the performances of the TACAN system.

关 键 词：塔康系统 方位角计算 最小二乘法 误差检测 拟合数据反馈 

分 类 号：TN911.72[电子电信—通信与信息系统] TP301.6[电子电信—信息与通信工程]