Volume 41 Issue 4
Jul.  2021
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Article Navigation >  Chinese Journal of Space Science  > 2021  >  41(4): 580-588
JIN Mengya, GUO Wei, LIU Peng, WANG Caiyun. Design of Digital Control System for High-performance Ionosonde Based on FPGA[J]. Chinese Journal of Space Science, 2021, 41(4): 580-588. doi: 10.11728/cjss2021.04.580
Citation: JIN Mengya, GUO Wei, LIU Peng, WANG Caiyun. Design of Digital Control System for High-performance Ionosonde Based on FPGA[J]. Chinese Journal of Space Science, 2021, 41(4): 580-588. doi: 10.11728/cjss2021.04.580
shu

Design of Digital Control System for High-performance Ionosonde Based on FPGA

doi: 10.11728/cjss2021.04.580 cstr: 32142.14.cjss2021.04.580

  • 1. National Space Science Center, Chinese Academy of Sciences, Beijing 100190;

  • 2. University of Chinese Academy of Sciences, Beijing 100049;

  • 3. Key Laboratory of Microwave Remote Sensing, Chinese Academy of Sciences, Beijing 100190

  • Received Date: 2020-03-04
  • Rev Recd Date: 2021-01-17
  • Publish Date: 2021-07-15
    Abstract
  • This paper presents a high-performance ionosonde's digital control system design scheme, which is consisted of timing control unit, transmitting unit and receiving unit. This system is employed in electromagnetic synchronization verification system on the ground to establish integrated electromagnetic observation systems of heaven and earth with the electromagnetic satellite, to realize real-time accurate observation of the ionosphere, and to provide scientific and effective data for the study of earthquake mechanism and earthquake prediction. Under the radar timing control with variable transmission and reception delay, the transmitting unit uses Digital Frequency Synthesis (DDS) technology to generate pulse signals with the frequency range is 1MHz to 30MHz. The pulse signal is encoded by the 40-bit quasi-Barker codes in binary phase shift keying modulation, and orthogonally polarized waves are transmitted alternately by the antenna. The analog-to-digital conversion of the receiving unit is realized by a high-speed Analog-to-Digital Converter (ADC), and the Digital Down-Conversion (DDC) is carried out by the Field Programmable Gate Array (FPGA) technology. The polarization information of the echo signal can be caught by the ionosonde. The height resolution of the ionosonde is 1.5km, the detection period of the ionosonde is less than 2min. The verification results show that the digital control system scheme is feasible.

     

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