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The reduction of measurement point for self-calibration method of systematic errors for DBF antenna using gating process

The reduction of measurement point for self-calibration method of systematic errors for DBF antenna using gating process

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Advances in Communications Satellite Systems: Proceedings of the 37th International Communications Satellite Systems Conference (ICSSC-2019) — Recommend this title to your library

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The National Institute of Information and Communications Technology (NICT) is currently researching and developing an array-fed reflector antenna that flexibly changes the coverage area using a digital beam-former (DBF) and improves the frequency utilization efficiency using a digital channelizer (DC) for next-generation communication satellites in the Ka-band. The systematic error calibration of an array feed is very important because the influence of phase errors appears prominently in the characteristics of the antennas. We propose a self-calibration system for an array feed using a pickup antenna and gating process to realize a more accurate systematic error calibration for array-fed reflector antennas. The calibration values for the array feed are obtained from the coupling characteristics using a pickup antenna from which the noise is removed by a gating process. This chapter shows the proposed method, procedure, and calibration results of the radiation pattern in an anechoic chamber. In order to determine the measurement parameters of the proposed method by parametric study, only the characteristics of the array feed were measured and evaluated. The calibration values, with gating a width of 0.01 ms, were almost the same compared with reference values. The calibrated radiation pattern using the proposed method was compared with a simulated radiation pattern, and the deviation in the Hand V-planes within a ± 60 range was about ±1.0 and ±0.6 dB, respectively. This chapter shows that the proposed self-calibration using a pickup antenna and gating process is effective for a DBF array feed.

Chapter Contents:

  • 34.1 Introduction
  • 34.2 Calibration system
  • 34.3 Measurement result using pickup antenna
  • 34.4 Radiation patterns
  • 34.5 Conclusion
  • References

Inspec keywords: anechoic chambers (electromagnetic); satellite antennas; array signal processing; reflector antenna feeds; reflectarray antennas; calibration; antenna radiation patterns; measurement errors

Other keywords: DBF array feed; calibrated radiation pattern; measurement point; gating process; array-fed reflector antennas; accurate systematic error calibration; time 0.01 ms; phase errors; self-calibration system; next-generation communication satellites; pickup antenna; digital beam; calibration values; systematic errors; digital channelizer; self-calibration method; noise figure 0.6 dB; frequency utilization efficiency

Subjects: Electromagnetic compatibility and interference; Antenna arrays; Signal processing and detection; Satellite communication systems; Antenna accessories; Measurement standards and calibration

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