Modeling and Simulating of Microwave Humidity and Temperature Sounder Onboard the FY-3(D) Satellite
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摘要:
针对风云三号卫星微波湿温度计，该文建立了全功率式微波辐射计系统的仿真模型，重点对热辐射噪声源、混频器、低噪放、滤波器与检波器等关键性器件进行了参数化建模。从信号处理的角度对全功率式微波辐射计的工作过程进行了模拟，并对仿真系统的输出功率、灵敏度和线性度进行评估与分析。通过与实际仪器的测试结果对比，验证了所提仿真模型的正确性。
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关键词:
- 风云三号(D)气象卫星 /
- 微波湿温度计 /
- 全功率式微波辐射计 /
- 毫米波系统建模 /
- 计算机仿真
Abstract:A simulation model of total power microwave radiometer is developed for the microwave humidity and temperature sounder onboard the FY-3 satellite. The key components such as mixer, low noise amplifier, local oscillator, filter and detector are parametrically modeled. The model is studied from the aspect of signal processing, and dynamic range, sensitivity and linearity of the simulation system are evaluated and analyzed. The correctness of the simulation model is verified by comparing them with the test results of the actual system.
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表 2 各级功率输出与检波电压输出结果
仿真功率(dBm) 实际功率(dBm) 3 K 340 K 3 K 340 K 滤波器 –10.75 –9.34 –10.69 –9.27 仿真检波电压(mV) 实际检波电压(mV) 检波器 20.21 27.92 20.04 27.56 
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表 3 系统线性度仿真结果
$\Delta G/G$(%) ${T_{\rm in} }(\rm K)$ ${V_{\rm C} }(\rm mV)$ ${V_{\rm H} }(\rm mV)$ ${V_{\rm out} }(\rm mV)$ $a$ $b$ ${T_{\rm out} }(\rm K)$ $\Delta T(\rm K)$ 0.024 3 20.63 27.59 17.75 30.17 –532.46 3.10 –0.10 0.057 80 20.65 27.64 20.32 30.04 –530.39 80.09 –0.09 0.055 160 20.67 27.64 22.99 30.13 –532.77 159.90 0.10 0.042 240 20.63 27.59 25.60 30.17 –532.46 239.96 0.04 0.039 320 20.74 27.74 28.41 30.00 –532.20 320.10 –0.10
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