For global navigation satellite system （GNSS） signals in Gaussian and Rayleigh fading channel, a novel signal detection algorithm is proposed. Under the low frequency uncertainty case, after performing discrete cosi...For global navigation satellite system （GNSS） signals in Gaussian and Rayleigh fading channel, a novel signal detection algorithm is proposed. Under the low frequency uncertainty case, after performing discrete cosine transform （DCT） to the outputs of the partial matched filter （PMF） for every antenna, the high order com- ponents in the transforming domain will be filtered, then the equalgain （EG） combination for the inverse discrete cosine transform （IDCT） reconstructed signal would be done subsequently. Thus, due to the different frequency distribution characteristics between the noise and signals, after EG combination, the energy of signals has almost no loss and the noise energy is greatly reduced. The theoretical analysis and simulation results show that the detection algorithm can effectively improve the signal-to-noise ratio of the captured signal and increase the probability of detection under the same false alarm probability. In addition, it should be pointed out that this method can also be applied to Rayleigh fading channels with moving antenna.展开更多
针对微弱信号环境卫星导航定位系统信号捕获概率低的问题,提出多个码元累积提高信噪比的捕获算法.该算法以部分匹配滤波器结合快速傅里叶变换相干累积(Partial Matched Filtering based on Fast Fourier Transform,PMF-FFT)单元为基础,...针对微弱信号环境卫星导航定位系统信号捕获概率低的问题,提出多个码元累积提高信噪比的捕获算法.该算法以部分匹配滤波器结合快速傅里叶变换相干累积(Partial Matched Filtering based on Fast Fourier Transform,PMF-FFT)单元为基础,通过复用实现多码元相干累积和非相干累积,获得了更长的码相干时间和更大的非相干累积增益,提高了捕获灵敏度,缩短了捕获时间,提高了抗干扰能力.仿真结果表明,该算法能明显提高系统捕获性能,在相同信噪比条件下,较普通PMF-FFT算法在捕获概率上提高约4dB,可应用于我国北斗二代卫星导航系统.展开更多
基金supported by the National Natural Science Foundation of China(61172138)the Natural Science Basic Research Plan in Shaanxi Province of China(2013JQ8040)+1 种基金the Fundamental Research Funds for the Central Universities(K5051302015K5051302040)
文摘For global navigation satellite system （GNSS） signals in Gaussian and Rayleigh fading channel, a novel signal detection algorithm is proposed. Under the low frequency uncertainty case, after performing discrete cosine transform （DCT） to the outputs of the partial matched filter （PMF） for every antenna, the high order com- ponents in the transforming domain will be filtered, then the equalgain （EG） combination for the inverse discrete cosine transform （IDCT） reconstructed signal would be done subsequently. Thus, due to the different frequency distribution characteristics between the noise and signals, after EG combination, the energy of signals has almost no loss and the noise energy is greatly reduced. The theoretical analysis and simulation results show that the detection algorithm can effectively improve the signal-to-noise ratio of the captured signal and increase the probability of detection under the same false alarm probability. In addition, it should be pointed out that this method can also be applied to Rayleigh fading channels with moving antenna.
文摘针对微弱信号环境卫星导航定位系统信号捕获概率低的问题,提出多个码元累积提高信噪比的捕获算法.该算法以部分匹配滤波器结合快速傅里叶变换相干累积(Partial Matched Filtering based on Fast Fourier Transform,PMF-FFT)单元为基础,通过复用实现多码元相干累积和非相干累积,获得了更长的码相干时间和更大的非相干累积增益,提高了捕获灵敏度,缩短了捕获时间,提高了抗干扰能力.仿真结果表明,该算法能明显提高系统捕获性能,在相同信噪比条件下,较普通PMF-FFT算法在捕获概率上提高约4dB,可应用于我国北斗二代卫星导航系统.
