A balloon-borne Lightning Radiation Source Simulation Device (LRSSD for short, its center frequency is 270 MHz) has been developed. It was used to calibrate the pulse power received by lightning VHF radiation receiver in Pingliang, Gansu Province. The LRSSD connects two receiving systems. One is the calibration system standard that uses the logarithmic antenna and the Spectrum analyzer to receive the 267~273 MHz of the simulated lightning signal, thus measuring the VHF radiation lightning pulse power. The other is the dipole antenna that connects preamplifier, logarithmic amplifier, and the data receiving system, thus measuring the output voltage. A relationship between the measured voltage value and the standard received radiation pulse power was established by using the nonlinear least squares method and changing the distance between the input and output within the working scope of amplifier. Then the calculation formula of the pulse radiation power value of the lightning was obtained. 29 cases space-time distribution of lightning radiation pulse power were obtained. Statistical results indicate the positive intracloud flash, the average radiation pulse power is about 4.8 W and 1.6 W in the upper positive and lower negative charge region, respectively. The radiation power in the upper positively charge area is higher than that in the lower negatively charge area. The negative intracloud flash, the average radiation pulse power is about 3.2 W and 2.6 W in the lower positive and upper negative charge region, respectively. The radiation power in the lower positively charged area is higher than that in the upper negatively charged area. The negative ground flash, the average radiation pulse power is about 3.0 W and 4.7 W in the negative and positive charge region, respectively. The results indicate that the source points in the negative charge area are less than that in the positive charge area. Most average radiation pulse power in positive charge area is greater than in the negative charge area. For some individual lightning flashes, the situation is reversed.
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