Abstract
<p indent=0mm>In a solar radio observation system, the receiver, as an essential instrument, processes the solar radio signal received by the antenna with amplification, filtering, digitization, and so on, and yields the solar radio dynamic spectrum. However, the amplitude–frequency inconsistencies of devices inside the receiver may lead to distortion of the output. In particular, the distortion increases when a broadband signal is processed by the receiver, and high uncertainty may appear. To solve this problem, in this paper we present a compensation method for the signal flatness for a solar microwave observing system. According to the analysis, the fluctuation of the signal flatness is caused by fluctuation of the gain with frequency and the random noise introduced by the system. First, we compensate the unflatness of the gain by subtracting the background signal from the observed signal. Quantile–quantile plots are then used to assess the compensation effect, and a new round of compensation is reprocessed if the plots do not follow a normal distribution. The integration times of the signals are finally deduced to reduce the random noise on account of the relationship between the integration times and noise depression. A simulation experiment can provide a good resolution for real-time data processing. This method has been used in the <sc>35–40 GHz</sc> broadband solar radio observation system in the Chashan Solar Radio Observatory of Shandong University and demonstrates good stability and application potential.
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call