射电毫秒级资料的定标与比较

THE CALIBRATION AND COMPARISON OF THE RADIO MS-RESOLUTION DATA

本文分析了太阳流量定标与接收机后端滤波器脉冲响应h(t)之间的关系,得出接收机增益系数q=k△f(?)h(t)dt/a.分析表明,对毫秒级资料进行平均平滑处理相当于在毫秒级记录的滤波器后面再串联一级数字滤波器.由于两级滤波器串联后总的脉冲响应h_s~*(t)与毫秒级滤波器脉冲响应h_(ms)(t)对无限时间作积分其结果相同(即,(?)h_s~*(t)dt=(?)h_(ms)(t)dt).因此毫秒级记录的定标可以利用由毫秒级资料平均平滑获得的秒级记录进行,这是一种简便的定标办法.本文引用1978年4月11日荷兰10cm波段毫秒级尖峰事件的资料说明,如果对毫秒级流量,f_(ms)(t)进行平均平滑则可还原为秒级流量,f_s(t),即:f_s(t)=1╱1000(?)f_(ms)(t).

We have analysed the relationship between Solar radio flux density, calibration and impulse response h(t) of the low-pass filter in the receiver, and obtained the gain factor q=k△fh(t)dt/a, Our analysis shows that the smoothed average of the ms-resolution data is equivalent to that obtained by series connecting a digital filter to the ms-resolution recorder. We have got the following integrated equation . Where h_s*(1)is total impulse function after the two levels of filter connected seriesly and h_(ms)(t) is impulse function of low-pass filter in the ms-resolution receiver. So the calibration of ms-resolution data can be made from sec-resolution data obtained from the smoothed average of the ms-re-solution data. This is a simple but very useful calibration method. Handling data of Dwingeloo in 10 cm wavelength indicate that if the ms-resolution flux density f_(ms)(t) is smoothed by average, it will return to the sec-resolution flux density f_s(t), and the following equation is got