| 摘要: |
| 在复杂电磁环境下，由于民航地空通信大频偏的要求，滤波器无法滤除波道内的干扰。针对此问题，提出了一种自适应抗干扰系统设计方法。对于落在波道内且与地空通信信号有效频带不重叠的干扰，首先对通信信号进行载波频率估计，然后使用自适应滤波方法进行干扰抑制；对于落在波道内且与地空通信信号有效频带重叠的恒包络干扰，首先重构载波信号，消除对恒包络信号估计的影响，然后根据恒包络信号的特性重构干扰信号并进行干扰分离。实验结果表明，该系统设计方法在不改变民航地空通信架构的前提下，抗有效频带外干扰的能力最大可以提升23.8 dB，抗恒包络干扰的能力最大可以提升39.4 dB，从而可以大幅提高航空飞行安全水平。 |
| 关键词: 民用航空 地空通信 复杂电磁环境 干扰抑制 干扰分离 飞行安全 |
| DOI： |
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| 基金项目: |
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| Design and performance analysis of an adaptive anti-interference system for civil aviation ground-to-air communication |
| YAO Yuanfei,YANG Wei,CHEN Liqiang |
| (1.Southwest China Institute of Electronic Technology,Chengdu 610036,China;2.Chengdu Spaceon Technology Co.,Ltd.,Chengdu 611731,China) |
| Abstract: |
| In the complex electromagnetic environment，due to the requirement of large frequency offset in civil aviation ground-to-air communication,the filter cannot filter out the interference in the channel.For this problem,a design method of adaptive anti-interference system is proposed.For the interference that falls in wave channel and does not overlap with the effective frequency band of ground-to-air communication signal,the carrier frequency of the communication signal is first estimated,and then the interference is suppressed by using the adaptive filtering method.For the constant envelope interference that falls in the channel and overlaps with the effective frequency band of the ground-to-air communication signal,the carrier signal is first reconstructed to eliminate the influence on the estimation of the constant envelope signal,and then the interference signal is reconstructed and separated according to the characteristics of the constant envelope signal.The experimental results show that the design method of the system can at most improve 23.8 dB ability to resist effective out-of-band interference and 39.4 dB ability to resist constant envelope interference without changing the civil aviation ground and air communication architecture,thus greatly improving the level of aviation flight safety. |
| Key words: civil aviation ground-to-air communication complex electromagnetic environment interference suppression interference separation flight safety |
