thermal noise measurement

The results indicate that, under the thermal noise approximation, the measurement accuracy of Brillouin frequency shift is dependent on thermal noise, the derivative of the transmission function of the edge optical filter and the power of Brillouin scattering optical signal.

结果表明，在热噪声近似下，布里渊频移测量精度与热噪声、边缘光滤波器透射函数的导数及布里渊散射光信号功率有关。

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The effects to height evaluation of the main noises, i.e. ocean surface backscatter speckle noise and receiver thermal noise, are analyzed. By analyzing the returned signals of several typical sea states, the results have shown that the system height measurement precision can be ± 2cm.

分析了主要噪声，即海面斑点噪声和接收机热噪声对高度估值的影响，通过对几种典型海况海面回波的模拟分析表明，系统则高精度可达±2cm。

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Compared to measurement data, this method greatly improves accuracy of mesoscopic noise model. In additions, for the first time designers could get the γ equation, which describes how the thermal noise factor γ varies with device terminal voltages.

通过与测试数据的比较，可以证明，这种计算方法不但大大提高了介观导体模型的精确度和适用性，并且首次给出了热噪声系数γ随端电压变化的方程。

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