基于軟件定義無線電的可編程微波輻射計設計

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中圖分類號：TB9;TP732.1 文獻標志碼：A

文章編號：1674-5124（2025）06-0132-09

Design of programmable microwave radiometer based on software defined radio

SHIMinghui1，2，LUHao1，LIUJingyi1，WANG Zhenzhan1 （1.National Space Science Center， Chinese Academy ofSciences，Beijing 10o190，China; 2. University of Chinese Academy of Sciences， Beijing 100049， China）

Abstract：Traditional microwaveradiometer has low integration，fixed RF front-end function，and limited programmability in digital back-end. To solve the above problems， a software defined radiometer with programmable RF front-end and digital processing back-end is designed and implemented based on software defined radio （SDR） technology. The core of programmable RF front-end adopts an SDR platform with zero intermediate frequency architecture， achieving configurable frequency ranges，bandwidth， gain， etc.Digital processing back-end uses an FPGA embedded in ARM to perform real-time FFT spectrum procesing and power spectrum integration，supporting the identification and elimination of radio frequency interference.This type of radiometer covers L， S and C bands， and integration time is adjustable within 500-1000ms . The system sensitivity is 0.13K through experimental testing inL band. In China， this software defined radiometer took the lead in realizing RF front-end programmability， supporting dynamic adjustment of working bands and parameters， and achieving a breakthrough.

Keywords： radiometer; programmability; software defined radio;FFT

0 引言

微波輻射計是被動式微波遙感電子儀器，可以觀測天線視場范圍內目標物體輻射、散射或反射的微波噪聲能量，并等效成亮溫表示。（剩余10998字）