A Study on the PRN Ranging Code of Satellite Navigation Systems

1、

Secondly, it introduces the frequency selection, EMC ( Electromagnetic Compatibility), the basic generation theory and modulation of the third civil signal ( L5 signal), including LS ranging code, Forward Error Correction, QPSK modulation and Neuman.

其次，介绍了其信号的频段选择、电磁兼容性及其调制和产生的基本原理，包括L5测距码、卷积码、QPSK调制以及Neuman。

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2、

According to actual needs, the thesis identifies specific parameters of code system and select JPL rapid capture based on m-m composite sequences as ranging code signals of the system.

根据实际需要论证了码制的具体参数，选择了基于m-m复合序列生成的JPL快捕码作为系统的测距码信号。

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3、

As an important feature, the characteristics of echo stretching affects SNR of received laser echo signal and ranging accuracy.

脉冲展宽特性是激光回波的重要特性，其影响到回波接收信噪比和测距精度。

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4、

Simluation results show that the maximum entropy spectral estimation and LMS adaptive algorithm can extract echo signal of laser ranging system effectively from background noises.

仿真分析表明，最大熵谱估计和LMS自适应算法相结合可以有效地从背景噪声中提取有用的激光反射回波信号。

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5、

Maximum entropy spectral estimation and LMS adaptive algorithm were proposed to extract the reflection echo signal of laser ranging system.

提出了最大熵谱估计和LMS自适应算法提取激光测距系统的反射回波信号。

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6、

Combined echo ranging echo sounding

组合回声测距与测深统一的回声测距与测深

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7、

Echo ranging of the South Sea Lion

南海狮的回声定位

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8、

CERES ( Combined Echo Ranging Echo Sounding) acoustic pulse echo system

声脉冲回声测距系统

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9、

Design and analysis of the lower electronic noise circuit with a ultrasonic pulse echo ranging system

低噪声回波测距系统的电路设计与系统分析

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10、

A multi-frequency pulse ranging algorithm based on phase comparison was proposed, its parameter selecting method was given and its performance was analyzed in theory;

建立了多频脉冲测距模型；提出了基于相位比对的多频脉冲测距算法，给出了该算法的参数选择方法；从理论上对算法的性能进行了分析；

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11、

A ranging algorithm of multi-frequency pulse ranging applied in the long stand-off distance fuze was proposed.

提出了一种应用在大炸高无线电引信中的多频脉冲测距算法。

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12、

In this thesis, it studied the semiconductor laser pulse ranging system receiver circuit in depth.

本论文深入研究了半导体激光脉冲测距接收系统电路。

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13、

The laser ranging technology is described, and a continuous wave pulse ranging system application is presented.

论文对激光测距技术进行了描述，提出了连续波脉冲测距体制的应用。

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14、

Study of Digital Detection of Underwater Laser Pulse Ranging

脉冲式激光水下测距数字检测技术研究

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15、

The Study of High-Precision LD Pulse Ranging Theory and Implementation

高精度LD脉冲测距理论与实现方法研究

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16、

Research on the Application of Multi-frequency Pulse Ranging Technology in Fuze

多频脉冲测距技术在引信中的应用研究

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17、

Squeeze the rest of the orange juice into a bowl and mix with the olive oil to make a dressing.

剩下的橙榨汁，混合着橄榄油，把碗里的原料一起搅拌做成色拉。

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18、

I usually squeeze the orange juice and Ron cooks the bacon and egg and we have the fresh bread as well.

我通常挤压橙子汁，若昂煎咸肉和鸡蛋。我们还有一些特别棒的新鲜面包。

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19、

Squeeze the orange, lemon and lime wedge over ice and then add the shot of fine gin.

榨出橘子、柠檬和莱檬的汁液，加入冰块和杜松子酒。

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20、

There is an orange, a book and a jacket over there.

那里有一个橘子、一本书、一件夹克衫。

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