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首页> 外文期刊>Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of >An Effective Emission Depth Model for Passive Microwave Remote Sensing
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An Effective Emission Depth Model for Passive Microwave Remote Sensing

机译：被动微波遥感的有效发射深度模型

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摘要

Knowing the exact penetration depth for passive microwave will enable us to gain a better understanding of the characteristics of the targets. But now, there is only a penetration depth model that can calculate the specific depth while it is suitable for active microwaves. However, due to the completely different working mechanisms, the penetration depth model is most likely limited when applying to passive microwaves. Therefore, an effective emission depth model for passive microwaves was first proposed based on the radiative transfer theory, assuming that a homogenous double-layer (soil and atmosphere) medium exists between the passive microwave radiometer and a certain soil depth. With simulated data from the advanced integral equation model (AIEM) and subsequent analysis, the effective emission depth model was further simplified to make it more practical with a root-mean-squared error (RMSE) of 0.46 cm and a bias of 0.032 cm. For the simplified model, only the soil moisture content and the noise-equivalent differential temperature and center frequency of the radiometer are required. By comparing the penetration depth model and simplified effective emission depth model, a certain soil moisture content that makes both the models reveal the same results is found.
机译：了解无源微波的确切穿透深度将使我们能够更好地了解目标的特性。但是现在，只有一个穿透深度模型可以计算出特定的深度，同时适用于有源微波。但是，由于完全不同的工作机制，当应用于无源微波时，穿透深度模型很可能受到限制。因此，首先基于辐射传递理论，提出了一种有效的无源微波辐射深度模型，假设无源微波辐射计与一定土壤深度之间存在均匀的双层（土壤和大气）介质。利用来自高级积分方程模型（AIEM）的仿真数据并进行后续分析，有效发射深度模型得到了进一步简化，使其具有0.46 cm的均方根误差（RMSE）和0.032 cm的偏差。对于简化模型，仅需要土壤湿度和辐射计的等效噪声温差和中心频率。通过比较渗透深度模型和简化的有效排放深度模型，发现使两个模型显示相同结果的特定土壤水分含量。

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