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| Citation: | CUI Anjing, LI Daojing, ZHOU Kai, et al. Research on the method of composing very low frequency signals based on the staggered array
[J]. Journal of Radars, 2020, 9(5): 925–938. doi: 10.12000/JR20082
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Research on the Method of Composing Very Low Frequency Signals Based on the Staggered Array
DOI: 10.12000/JR20082
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Abstract
The Very Low Frequency (VLF) signal of 10 kHz has strong penetrability of ground objects. Because of the antenna size, its application is limited. Therefore, it is important to study the VLF signal generation method based on appropriately sized high frequency radar antennas. The concept of generating VLF signal with high frequency array antenna is proposed in this paper. The waveform of the emission signal, staggered array structure design, and array parameter selection methods are presented and discussed. The pulse width of the composite signal is increased by using periodic pulse signals as radiation element signals. The resting period of the pulse signals is filled with the pulse width expansion generated by the array and the VLF signal with continuous time is composed in the target area. The performance of the composite VLF signal and the energy utilization of the emission signal are evaluated using Peak SideLobe Ratio (PSLR), Integrated SideLobe Ratio (ISLR) and through the spectrum comparison between the emission signal and the composite signal. With the 10 kHz VLF signal composed by 100 MHz radiant element signals, the hundred meter array is simulated. When the staggered array is constituted by nine arrays and the pulse width of the radiation element is set to 0.115 μs, PSLR and ISLR of the composite signal spectrum are –13.34 dB and –9.44 dB respectively, and the energy proportion of 10 kHz low-frequency signal in the composite signal is 89.79%. The effects of radiation element spacing error, time error, phase error and amplitude error of the radiation element signal and the target’s deviation are analyzed. It is found that the proposed method is an effective one and the simulation results have illustrated the effectiveness. -
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References
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- Figure 1. Radar motion diagram
- Figure 2. The emission/received signal waveform and spectrum of Doppler effect
- Figure 3. Schematic diagram of the decomposed process of radar transmitting signals and the equivalent radar motion generated by the antenna array
- Figure 4. Staggered array structure
- Figure 5. Schematic diagram of the radiation unit signal
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Figure 6. Waveform, spectrum and spectral contrast diagram of the composite signal when the radiation unit signal period being
${{{T_0}} / 2}$ -
Figure 7. Waveform, spectrum and spectral contrast diagram of the composite signal when the radiation unit signal period being
${{{T_0}} / 6}$ -
Figure 8. Waveform, spectrum and spectral contrast diagram of the composite signal generated by the 9-row staggered array when the radiation unit signal period being
${{{T_0}} / 6}$ - Figure 9. Schematic diagram of the envelope of radiation unit signals
- Figure 10. The distribution of spacing error, waveform and spectrum of the composite signal in target area
- Figure 11. The distribution of radiation unit signal time error, waveform and spectrum of the composite signal in target area
- Figure 12. The distribution of radiation unit signal phase error, waveform and spectrum of the composite signal in target area
- Figure 13. The distribution of radiation unit signal amplitude error, waveform and spectrum of the composite signal in target area
- Figure 14. Waveform and spectrum of the composite signal in the target area when the target is 20 km away from the near end of the array at 45° scanning angle in xoy plane
- Figure 15. Waveform and spectrum of the composite signal in the target area when the target is 40 km away from the near end of the array at 45° scanning angle in xoy plane
- Figure 16. Waveform and spectrum of the composite signal in the target area when the target deviates 1 km along the z-axis
- Figure 17. Waveform and spectrum of the composite signal in the target area influenced by synthetical error