lofar谱matlab_lofar是什么意思
1. A new method is presented in this paper for the calculation of waveguide invariant with passive sonar lofargram image.
摘要该⽂提出了利⽤被动声纳信号LOFAR谱图的⼆维傅⾥叶变换计算波导不变量的⽅法。
2. Secondly, 4 methods of azimuth estimation based on vector hydrophone according to forms of nosie and signal are brought forward. The principles of these 4methods are set forth, simulating them by computer. Acoustic intensity averager can effectively suppress isotropic non-coherent interference; DOA based on line-spectra can effectively detect the target radiating line-spectra and estimate its azimuth angle; Bar graph approach can suppress line-spectra coherent interference and distinguish different targets radiating line-spectrum. Weighted bargraph approach can detect target in broadband coherent interference and estimate its azimuth angle.
其次，根据背景⼲扰和信号样式的不同，提出了单⽮量⽔听器⽅位估计的4种⽅法；阐述了这4种⽅法的原理，并进⾏了计算机仿真，指出平均声强器⽅位估计适⽤于各向同性噪声场背景⼲扰，讨论了平均声强器的处理增益；⽬标辐射噪声中有线谱时，线谱⽅位估计有很好的性能，其中的LOFAR线谱和⾼频解调得到的DEMON线谱都是⽬标的特征谱线，可以利⽤它们进⾏⽅位估计，详细讨论了利⽤特征线谱单
个⽮量⽔听器分辨多⽬标的性能；直⽅图⽅位估计能抗强线谱相⼲⼲扰；加权直⽅图⽅位估计可以抗宽带相⼲⼲扰。
3. LOFAR Sonobuoy Signal Processing Based on Adaptive Line Enhancer and Doppler-CPA Positioning
基于⾃适应线谱增强的LOFAR浮标信号处理及Doppler-CPA定位⽅法
4. A 160 Gbit/s demonstrator towards the application for a low frequency antenna array network called LOFAR is presented.
报告了⼀个⽤于低频射频天线⽹络LOFAR的160Gbit/s演⽰平台。
5. Principal Component Analysis on Lofar Spectrum Features of Underwater Target Signals
⽔下⽬标信号的Lofar谱图特征的主分量分析研究
6. By DEMON we can get more and stabler line spectrum information than by LOFAR, which is to make power spectrum analysis of signal directly. Several demodulation methods are introduced and compared.
通过包络解调技术可获得轴频等调制信息，这就是常⽤的DEMON谱分析⽅法。
several什么意思7. It focuses on the system hardware design and data acquisition and processing software, a detailed description of the LOFAR digital signal processing and graphics display, sensor design, debug and test chamber sphere tank experiment design steps.
重点分析了系统硬件设计及采集处理软件的功能，详细描述了LOFAR数字信号处理及图形显⽰⽅式、传感器球体设计、试验室调试及⽔池试验等设计步骤。