| 摘要: |
| 针对载体旋转状态下的连续导航抗干扰应用场景，实现了一种BDII双通道及GPS单通道环带有源天线，具备BD导航信号窄带抗干扰，以及GPS导航信号接收。半柔性天线通过均匀分布的螺钉紧固在柱状金属桶上实现共形。通过表面涂敷薄层耐高温材料，实现了天线加固及隔热。三路无源环带天线分别采用通过8个单元微带合成，以最大程度减小径向增益均匀性；合成信号分别经过独立的低噪声放大器及下变频接收机实现导航定位；在此基础上，下变频接收机中针对旋转特性对晶振进行了加速度降敏设计，以减小参考源频率漂移。对天线进行了实际测试，结果表明，该天线在1268.52MHz中心频率实现了±12MHz的3dB带宽；在1575.42MHz中心频率实现了±2MHz的3dB带宽；3Hz旋转时接收卫星信号定位稳定，两种导航信号信噪比均大于42dB。 |
| 关键词: 右旋圆极化 双馈 环带天线 微带合成 |
| DOI：DOI:10.3969/j.issn.1672-2337.2020.02.017 |
| 分类号:TN823 |
| 基金项目:“十三五”装备预研基金（No.H7036.1）；山西省自然科学基金（No.201701D121066） |
|
| Design of a BDII/GPS Anti Jamming Ring Like Active Antenna |
|
WANG Xiaoguang
|
|
The 10th Research Institute of China Electronics Technology Group Corporation，Chengdu 610036，China
|
| Abstract: |
| Aiming at the application scenario of continuous navigation anti jamming under carrier rotation，a BDII dual channel and GPS single channel ring band active antenna is realized. It can achieve the narrow band anti jamming of BD navigation signal and the reception of GPS navigation signal. The semi flexible antenna is tightened to a cylindrical metal barrel by uniformly distributed screws to achieve conformity. The antenna is strengthened and insulated by coating a thin layer of high temperature resistant material on the surface. Three passive ring band antennas are synthesized by eight units of microstrip to minimize the radial gain uniformity. The synthesized signals pass through the independent low noise amplifiers and the down conversion receivers respectively to realize navigation and location. On this basis，the crystal oscillator is reinforced in the down conversion receivers to reduce the frequency drift of the reference source. The test results show that the antenna achieves a 3 dB bandwidth of (±12MHz) at the center frequency of 1268.52MHz，a 3dB bandwidth of (±2MHz) at the center frequency of 1575.42MHz，a stable positioning of the receiving satellite signal when rotating at 3Hz，and the signal to noise ratios of both navigation signals are greater than 42dB. |
| Key words: right hand circular polarization (RHCP) dual feed ring like antenna microstrip synthesis |
