论文部分内容阅读
从信号检测的角度出发,分析了数字波束形成辐射计输出信号的数学期望和方差.在此基础上推导数字波束形成微波辐射计灵敏度公式,并与全功率辐射计、综合孔径辐射计进行了比较.分析结果表明:观测点源时,由于接收天线和通道数量的增加,数字波束形成辐射计的灵敏度要优于全功率辐射计;观测展源时,受阵列方向图的影响,数字波束形成辐射计的灵敏度比全功率辐射计的灵敏度要差;与综合孔径辐射计相比,两者的灵敏度是一致的.
From the perspective of signal detection, the mathematical expectation and variance of the output signal of the digital beamforming radiometer are analyzed, and the sensitivity formula of the digital beamforming microwave radiometer is derived and compared with the full power radiometer and synthetic aperture radiometer The analysis results show that the sensitivity of the digital beamforming radiometer is better than that of the full power radiometer when observing the point sources because of the increase of the number of receiving antennas and channels. When observing the source, the influence of the array pattern, the digital beamforming radiation The sensitivity of the meter is worse than the sensitivity of the full power radiometer; the sensitivity of the two is the same as that of the synthetic aperture radiometer.