摘要
广播式自动相关监视(Automatic-Dependent-Surveillance-Broadcast,ADS-B)技术是目前国际民航组织ICAO推荐的新型空域监管技术。针对星载环境下的低信噪比场景,为了进一步提高ADS-B信号解调算法的成功率,提出了一种ADS-B信号相干解调算法。该算法依靠频域恒虚警方法进行信号到来检测,通过基于FFT算法的频偏、相偏估计算法消除频偏和相偏的影响,并使用互相关取最大值的方式进行帧头定位。计算机仿真表明,该算法在Eb/N0=10 dB时解调成功率达到90%,达到了贴近理论值的高解调性能。
Automatic Dependent Surveillance-Broadcast(ADS-B)technology is recommended as a new airspace surveillance technology by the International Civil Aviation Organization(ICAO).To further improve the success rate of ADS-B signal demodulation algorithms in low signal-to-noise ratio scenarios in satellite-based environments,an ADS-B coherent demodulation algorithm is proposed.This algorithm utilizes frequency domain constant false alarm rate method for signal arrival detection,employs FFT-based algorithms for frequency and phase offset estimation to compensate for the effects of frequency and phase offsets,and utilizes cross-correlation to locate the frame header by selecting the maximum correlation value.Computer simulations demonstrate that the proposed algorithm achieves a demodulation success rate of 90%at Eb/N0=10 dB,demonstrating high demodulation performance close to theoretical values.
作者
孙欣伟
王建新
SUN Xinwei;WANG Jianxin(School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《电子设计工程》
2025年第5期192-196,共5页
Electronic Design Engineering
关键词
ADS-B
相干解调
恒虚警检测
互相关
ADS-B
coherent demodulation
constant false alarm detection
cross-correlation
