Modernized Solar Radio Spectrograph in the L Band Based on Software Defined Radio
Abstract
:1. Introduction
1.1. Radio Diagnostics in Solar Flare Research
1.2. Direct Influence of the Solar Radio Bursts on the Radio Systems
1.3. The Motivation for Modernization of Solar Radio Spectrography Instruments
2. Design Concepts Analysis
2.1. Technical Requirements
- Processing frequency range min. 1/2 GHz.
- Frequency bins spacing <1 MHz.
- Time resolution ≤1 ms.
2.2. Receiver Hardware Concept
- Need of the high-speed analog-to-digital converters;
- Cost of the high-performance FPGA;
- Software IP cores for FPGA for interfacing the ADC;
- Challenging design of high selectivity wideband radio frequency (RF) filters or intermediate frequency (IF) filters.
- Problem with the semiconductor noise 1/f.
- DC offsets, and an interference of the local oscillator that oscillates in the middle of the processing frequency band.
- Amplitude and phase unbalance that causes a crosstalk between upper and lower sidebands.
3. Implementation and Results
3.1. Spectrograph Hardware
3.2. FPGA Signal Processor Content
3.3. Testing
3.4. Test Results
4. Discussion and Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Parameter | Value | Note |
---|---|---|
Usable bandwidth | 250 MHz | |
Operating range | 400 MHz/6 GHz | (Center frequency) |
Full Scale | −25/+5 dBm | Programmable, step 1dB |
Sampling rate | 310 MHz | |
ADC resolution | 2× 14 bits | IQ sampling |
Baseband filters | 6th order Cauer, symmetrical | |
Filter pass-band | 0/125 MHz, 0.5 dB ripple | |
Stop-band | ≥155 MHz, Attenuation ≥50 dB | |
Data interface | USB 2.0 device | |
Synchronization | 1 PPS | Free running mode 1.1s if 1 PPS signal is not present |
Parameter | Value |
---|---|
FFT length | 1024 |
Frequency bin size | 302,704.375 Hz |
Number of averaging (M) | 300 |
Parameter | RT5 Analog Spectrograph | Designed Digital Spectrograph |
---|---|---|
Time resolution | 10 ms shared by 256 channels | 1 ms |
Frequency resolution | 4 MHz | 303 kHz |
ADC resolution | 12 bit | 14 bit |
Dynamic range | 36 dB | 50 dB |
QSR/noise ratio | 3.7 dB | 3–10 dB (impact of antenna) |
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Puricer, P.; Kovar, P.; Barta, M. Modernized Solar Radio Spectrograph in the L Band Based on Software Defined Radio. Electronics 2019, 8, 861. https://doi.org/10.3390/electronics8080861
Puricer P, Kovar P, Barta M. Modernized Solar Radio Spectrograph in the L Band Based on Software Defined Radio. Electronics. 2019; 8(8):861. https://doi.org/10.3390/electronics8080861
Chicago/Turabian StylePuricer, Pavel, Pavel Kovar, and Miroslav Barta. 2019. "Modernized Solar Radio Spectrograph in the L Band Based on Software Defined Radio" Electronics 8, no. 8: 861. https://doi.org/10.3390/electronics8080861