有限测试距离对GNSS抗干扰天线阵远场测试的影响

文章分析了暗室测试中有限测试距离对GNSS抗干扰天线阵测量结果的影响.在固定波束情况下，远场测试条件遵循经典结论，即在待测天线与探头天线距离大于2D²/λ（D为待测天线有效孔径）时，有限测试距离对方向图主瓣影响很小，但会掩盖方向图波瓣零点；在自适应处理情况下，由于自适应权会自动补偿干扰导向矢量误差，所以有限距离误差并不会对零点的位置和深度造成影响，对方向图除零点之外部分的增益造成一定偏差，但是这些增益偏差不会对抗干扰天线阵的平均阵列增益覆盖率造成显著影响.所以，在满足经典远场条件的暗室内进行抗干扰测试，接收机的干扰抑制能力和可用性能均不会受到影响.

Influence of Limited Test Distance on Far-field Measurement for GNSS Anti-jamming Array

This paper analyzes the limited distance induced effects of measurement performance for GNSS anti-jamming arrays.In the case of fixed beam array,according to the conventional far field condition,when the distance between the antenna under test and the probe antenna is longer than 2D²/λ (D is the size of antenna aperture),the limited test distance has little effects of the main beam,however,the first null of the pattern is partially filled.In the case of adaptive array,the nulls are kept for the limited distance induced steering vectors of interferences will be compensated by adaptive weights.The gain except for the nulls has some changes,but the bias has no remarkable effects of average angular coverage for array gain.We claim that the capability of anti-jamming and the usability of the receiver will be kept,when the test distance meet the condition of minimized far field distance.