| 1. | Research on technique of passive sonar target recognition based on line spectrum feature extraction
基于线谱特征提取的被动声纳目标识技术研究 |
| 2. | Research on technique of passive sonar target recognition based modulation line spectrum feature extraction
基于调制线谱特征提取的被动声呐目标识别技术研究 |
| 3. | Filter is used to transmit spectrum of definitive broadband in the continuous spectrum or to extract certain radiation in the line spectra
光学滤光片在连续的光谱中用于透过一定宽度的光谱带或在线状光谱中提取某些辐射。 |
| 4. | A conception of phase dynamic coupling is defined . the foc of the mot - radiated line spectrum signals is theoretically derived
在研究中，定义了相位动态耦合的概念，推导了水下运动目标辐射线谱信号的四阶累积量表征公式。 |
| 5. | Of the gas . since different gas has different set of lines , we can tell which kind of gas it is by analyzing the line spectrum
不同的气体会产生不同的线条，就如人类的指纹，只要分析光谱上的吸收线，便可以知道光波曾经通过的气体成分。 |
| 6. | Hence , the spectrum is called a line spectrum ; it is also called an atomic emission spectrum , since it is produced by emission of light from excited atoms
因此，这个光谱也被称为线光谱，也被称为原子发射光谱，因为它是由被激活的原子发出的光产生的。 |
| 7. | The results show that the self - adaptive filter can be used to detect line spectrum , the wavelet transform and the fourier transform can be used to detect the ship noise in modulating the anisotropic noise field
结果表明：自适应滤波对于各向异性噪声场中的线谱检测有良好的效果；而小波变换和短时傅里叶变换对各向异性噪声场中的舰船噪声调制信号检测有良好的效果。 |
| 8. | The main research contents of the physical design include : presenting the domestic and international status of space weather and expanding on the need and the importance about the space weather forecast ; sorting the disastrous space weather and discussing their effects and adapted prediction methods ; analyzing the solar disturbing resources of space weather and the precursor or concomitant phenomena of solar eruption based on the newest observational results ; probing into the radiation principle of solar short - wave ray and presenting the computing methods about solar continuum and line spectrum radiation ; extrapolating physical methods of reconstructing the temperature and the emission measure of coronal plasma ; argumenting the effective observing spectrum for space weather empirical forecast and space weather numerical forecast
物理设计的主要研究内容包括：分析目前国内国际空间天气预报的发展现状及开展空间天气预报的必要性和重要性；分类讨论了灾害性空间天气的种类、影响及目前国际上的预报方法：分析了空间天气太阳扰动源及扰动源爆发的先兆现象或者伴生现象；讨论了太阳短波辐射线谱和连续谱辐射强度的计算方法：推导了利用望远镜多波段的观测结果反演日冕等离子体温度、发射量等参数的物理方法：论证了开展空间天气经验预报和发展数值预报有效的成像谱段。 |
| 9. | Experiments show that , when use msp430f149 audio sensor to identify vehicles that contain plane , tank , truck and so on by time domain features and two - level f - ratio , the recognition rate is 82 . 1 % ; when use both msp430f149 audio sensor and arm9 sensor to identify vehicles , and the recognition rate is much better than the original system and msp430f149 audio sensor . line spectrum of power spectra and 3 / 2 spectrum is used as frequency features on arm9 sensor , and it is caught by narrow - band bandpass filter
实验证明,在主频为8mhz的msp430f149感知器上,采用基于时域特征和二阶f比的识别算法,能够实时地完成对飞机、坦克、卡车等交通工具的识别;将msp430f149感知器与基于arm9的高端感知器配合使用,且高端感知器采用功率谱线谱或3 / 2维谱线谱作为频域识别特征,能够实时的对各类交通工具做更高性能的识别。 |
