汽车天线偏心测试的系统设计与试验验证

随着智能网联汽车的迅速发展,汽车对外通信性能的重要性显著提高,但汽车体积大、重量沉,无法直接借鉴传统通信行业的天线系统测试方法。本文以智能网联汽车的天线系统为研究对象,研究出一种改进的近远场变换算法,并基于该方法设计出一种合理的验证方案,从而降低因汽车测试位置偏移对试验结果的影响。研究表明,当以整车作为被测件时,车载天线在测试系统中心和整车几何中心在测试系统中心的情况下,近场测试数据存在明显的较大差异;然而通过正确的NF-FF变换处理,两者远场辐射方向图都是一致的。说明了在球面近场系统测量加近远场变换的处理下,可以得到整车远场辐射信息。该结论对推动整车无线性能测试提供了实验和验证基础。

Study on System Design and Validation of Vehicle Antenna Eccentricity Test

With the rapid development of intelligent connected vehicles, the importance of external communication performance of vehicle has increased significantly. However, because of the large size and heavy weight of vehicles, it cannot directly learn from the antenna system test method of the traditional communication industry. This paper takes the vehicle antenna as the research object, and carries out a comparative study on vehicle antenna testing by improving the NF-FF transformation algorithm and combining the special application scenarios of vehicle testing. Research has shown that when the vehicle is used as the DUT, there is a significant difference in the near-field test data when the vehicle antenna is in the center and the geometric center of the vehicle is in the test center;however, through correct NF-FF transformation processing, both far-field radiation patterns are consistent. It shows that the far-field radiation information of the whole vehicle can be obtained under the processing of spherical near-field measurement and NF-FF transformation. This conclusion provides a basis for the promotion of wireless performance testing of the vehicle.