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| Citation: | CHEN Shiqiang and HONG Wen. Analysis on the transmit distortion of the circular polarized wave based on the axial ratio parameter
[J]. Journal of Radars, 2020, 9(2): 343–353. doi: 10.12000/JR19063
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Analysis on the Transmit Distortion of the Circular Polarized Wave Based on the Axial Ratio Parameter
doi: 10.12000/JR19063
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Abstract
Compact Polarimetric (CP) mode is a new dual-pol mode introduced in the last decade. The main current CP mode transmits circular polarized waves. Data in the form of Stokes parameters obtained by this mode has rotational invariance. In real engineering applications, transmit distortions in all dual-pol modes, including the CP mode, cannot be directly compensated with external calibration methods. Therefore, it is necessary to analysis the influences caused by transmit distortions. Until now, the Maximum Normalized Error (MNE) parameter has already been proposed by existing researches to analyze polarimetric quality of the Polarimetric SAR (PolSAR) system. This paper has proposed an analysis method to analysis the influence of transmit distortions in polarimetric modes with circular polarimetric wave in transmission, based on the Axial Ratio (AR) parameter of real transmitted wave. Firstly, this paper has analyzed the influence of different transmit distortion sources to AR parameter with simulations. Meanwhile, this part has also demonstrated the influence of same distortion sources to the MNE parameter. Through comparison of this two results, this paper has concluded three advantages of the AR parameter over the MNE parameter. At last, the effectiveness of the proposed evaluation method has been verified using real measured GF-3 distortion data and test data obtained by experimental system, which transmit circular polarized waves. -
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References
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- Figure 1. The polarization ellipse
- Figure 2. The influence of transmit channel imbalance’s amplitude and phase to AR of actually transmitted polarized wave
- Figure 3. The influence of transmit channel imbalance’s phase, when it’s amplitude equals 0 dB, to AR of actually transmitted polarized wave
- Figure 4. The influence of transmit channel imbalance’s amplitude, when it’s phase equals 0°, to AR of actuallytransmitted polarized wave
- Figure 5. MNE caused by the amplitude and phase of transmit channel imbalance
- Figure 6. MNE caused by the phase of transmit channel imbalance when it’s amplitude equals 0 dB
- Figure 7. MNE caused by the amplitude of transmit channelimbalance when it’s phase equals 0°
- Figure 8. The relationship between MNE and AR of actually transmitted polarized wave when transmit channel imbalance’s phase equals 0° and amplitude changes
- Figure 9. The relationship between MNE and AR of actually transmitted polarized wave when transmit channel imbalance’s amplitude equals 0 dB and phase changes
- Figure 10. The influence of transmit crosstalk’s amplitude, when it’s phase distortion equals 0°, to AR of actuallytransmitted polarized wave
- Figure 11. The influence of transmit crosstalk’s phase, when it’s amplitude distortion equals –20 dB, to AR of actually transmitted polarized wave
- Figure 12. MNE of transmit crosstalk’s amplitude, when crosstalk’s phase equals 0°
- Figure 13. MNE of transmit crosstalk’s phase, when crosstalk’s amplitude equals –20 dB
- Figure 14. Relationship between the difference of phase, the ratio of amplitude (difference in dB) of two transmit channelsand the AR parameter