11 results on '"Huayu Fan"'
Search Results
2. Folded Clutter Suppression for Pulse-Doppler Radar Based on Pulse-Agile Waveforms
- Author
-
Yinghao Sun, Huayu Fan, Lixiang Ren, Erke Mao, and Teng Long
- Subjects
Signal Processing ,Electrical and Electronic Engineering - Published
- 2022
3. A Stationary Clutter Suppression Method for 3-D Micromotion Measurements Based on Wideband Radar Amplitude and Phase Information
- Author
-
Wenji Li, Huayu Fan, Lixiang Ren, Kaifu Hou, Zhilong Zhang, and Erke Mao
- Subjects
General Earth and Planetary Sciences ,Electrical and Electronic Engineering - Published
- 2022
4. Optimization of Diverse PCFM Waveforms and Joint Mismatched Filters
- Author
-
Lixiang Ren, Yinghao Sun, Teng Long, Mao Erke, Huayu Fan, and Jingdong Wang
- Subjects
020301 aerospace & aeronautics ,Continuous phase modulation ,Computer science ,Aerospace Engineering ,02 engineering and technology ,Filter (signal processing) ,Instantaneous phase ,Signal-to-noise ratio ,0203 mechanical engineering ,Modulation ,Robustness (computer science) ,Waveform ,Electrical and Electronic Engineering ,Algorithm ,Pulse-width modulation - Abstract
Finding codes for the desired autocorrelation function (ACF) based on phase-coded modulation waveforms has always been a popular research topic, and the relevant literature is abundant. However, the optimized ACF may not be obtained in band-limited hardware due to the extended spectral sidelobes generated by instantaneous phase changes. Polyphase-coded FM (PCFM) waveforms based on continuous phase modulation (CPM), which uses a shape filter to smooth phase jumps, can provide effective spectral containment. However, for PCFM waveforms using the existing optimized phase codes, the original desired property of the ACF, e.g., a low integrated sidelobe level (ISL) or weighted ISL (WISL), will not be obtained because of the smoothness among all phases. Hence, PCFM waveforms based on CPM should be redesigned and optimized. Moreover, designing pulse-agile waveforms with different phase codes to mitigate range ambiguity has also attracted increased attention in recent years. However, different waveforms will yield range sidelobe modulation (RSM) in Doppler processing, which degrades the attendant Doppler coherency, leading to high sidelobes in the Doppler dimension. In this article, optimization algorithms for designing diverse PCFM waveforms and relevant joint mismatched filters (JMMFs) are proposed. A CPM-based cyclic algorithm (CPM-CA) using the method of alternating projection for optimizing the PCFM waveform with a desired ACF is proposed in the first step. The design of multiple diverse PCFM waveforms with similar ACFs and a small RSM effect is also considered. Then, to further optimize the ISL/WISL and reduce the RSM effect, a novel method for designing JMMFs using a cyclic algorithm (JMMF-CA) is proposed. Simulations and an experiment based on a real radar system indicate that the optimized PCFM waveforms and JMMFs using CPM-CA and JMMF-CA can yield a desired ISL/WISL while achieving a small RSM effect with a low loss of signal-to-noise ratio and satisfactory Doppler robustness.
- Published
- 2021
5. Synthetic wideband range profiling method for moving targets based on phase‐derived velocity measurement
- Author
-
Huayu Fan, Erke Mao, Lixiang Ren, and Wenji Li
- Subjects
Profiling (computer programming) ,Optics ,Materials science ,business.industry ,Telecommunication ,Range (statistics) ,Phase (waves) ,TK5101-6720 ,Electrical and Electronic Engineering ,Wideband ,business ,Velocity measurement - Abstract
Synthetic wideband signals can obtain a wide spectrum and thus achieve a high range resolution by synthesizing separately emitted signals. A synthetic wideband range profiling method for moving targets based on phase‐derived velocity measurement is proposed. Highly accurate velocity measurement results are obtained by analysing the echo phase information of a moving target, and the accuracy of the velocity estimation results can meet the requirement of the velocity compensation in the synthetic wideband range profiling process. After analysis of the spectrum envelope and the phase of a moving target, a method for synthesizing wideband signals in the frequency domain, thus obtaining a high‐resolution range profile, is developed. The constraint conditions for the motion compensation and synthesis process are analysed and discussed by simulation, and the effectiveness of the proposed method is verified under various circumstances.
- Published
- 2021
6. A High-Accuracy Phase-Derived Velocity Measurement Method for High-Speed Spatial Targets Based on Stepped-Frequency Chirp Signals
- Author
-
Quanhua Liu, Erke Mao, Wenji Li, Huayu Fan, and Lixiang Ren
- Subjects
Computer science ,Acoustics ,0211 other engineering and technologies ,Phase (waves) ,02 engineering and technology ,law.invention ,Compensation (engineering) ,symbols.namesake ,law ,Chirp ,symbols ,Range (statistics) ,General Earth and Planetary Sciences ,Electrical and Electronic Engineering ,Radar ,Wideband ,Velocity measurement ,Doppler effect ,021101 geological & geomatics engineering - Abstract
In this article, we propose a phase-derived velocity measurement (PDVM) method for high-speed spatial targets based on the stepped-frequency chirp signal (SFCS). This method is capable of accurately measuring the velocity of high-speed targets and yields root-mean-squared error values at the level of centimeters per second; therefore, it has great potential for measuring the micromotion of targets and is of significant importance for target recognition. The traditional phase-derived measurement method is not applicable for high-speed targets. The main challenge that we have solved is how to extract the echo phase from the high-resolution range profile, which is corrupted by range migration, intrapulse motion, and range straddling under high-speed target conditions. To guide the implementation of the proposed method in radar systems, constraint conditions for the compensation accuracy are thoroughly derived and systematically justified under different radar parameter settings. The simulation results are presented to validate the high accuracy of the method under various circumstances. In addition, the small-amplitude micromotion measurement capability of the proposed method is verified, and reconstruction of the target micromotion trajectory is demonstrated.
- Published
- 2021
7. Range-Doppler Sidelobe Suppression for Pulse-Diverse Waveforms
- Author
-
Mao Erke, Yinghao Sun, Teng Long, Huayu Fan, and Quanhua Liu
- Subjects
Modulation effect ,Computer science ,Pulse (signal processing) ,Matched filter ,Acoustics ,Bandwidth (signal processing) ,Doppler radar ,Aerospace Engineering ,Interference (wave propagation) ,Window function ,law.invention ,symbols.namesake ,Signal-to-noise ratio ,law ,symbols ,Waveform ,Electrical and Electronic Engineering ,Radar ,Doppler effect - Abstract
Waveform diversity, which can be used to obtain synthetic bandwidth or mitigate range ambiguity, interference, and folded clutters, has attracted a great deal of attention in recent years. However, the range sidelobe modulation effect between agile pulses yields high range-Doppler sidelobes in pulse-Doppler (PD) radar applications, because of which traditional window functions or mismatched filters (MMFs) do not apply. In this article, a Doppler-tuned matched filter is used to equivalently obtain the PD result. Then, to mitigate the high range-Doppler sidelobes, a two-dimensional MMF (2-D MMF) is proposed, and the relevant signal-to-noise ratio (SNR) loss is deduced. A cyclic algorithm is also designed to calculate the 2-D MMF for suppressing sidelobes over desired range-Doppler regions with constrained SNR loss and mainlobe width. Several simulations and an experiment based on real measured data of an airborne platform are conducted to illustrate the effectiveness of the proposed 2-D MMF.
- Published
- 2020
8. A High-Precision Phase-Derived Velocity Measurement Method for High-Speed Targets Based on Wideband Direct Sampling LFM Radar
- Author
-
Huayu Fan, Lixiang Ren, Jian Yang, Erke Mao, and Quanhua Liu
- Subjects
Computer science ,Acoustics ,0211 other engineering and technologies ,Phase (waves) ,02 engineering and technology ,law.invention ,Acceleration ,symbols.namesake ,Modulation ,law ,symbols ,General Earth and Planetary Sciences ,Point (geometry) ,Electrical and Electronic Engineering ,Wideband ,Radar ,Doppler effect ,021101 geological & geomatics engineering - Abstract
This paper proposes a phase-derived velocity measurement (PDVM) method for high-speed targets based on wideband direct sampling linear frequency modulated radar. First, a high-speed target echo model considering intrapulse Doppler modulation is developed. Then, a PDVM model considering acceleration is established. The key to realizing PDVM is resolving phase ambiguity. Under low signal-to-noise ratio (SNR) conditions, a joint processing method combining acceleration information and multiframe data to solve phase ambiguity is proposed, which can significantly reduce the SNR requirement for PDVM. In this paper, the small-amplitude micromotion measurement capability of the proposed method is verified by simulation. Moreover, the measured data of a Ku-band ground-based radar are used to verify the applicability of the PDVM method under low SNR conditions and its feasibility to be applied to complex multi-scattering point targets. Both the simulation and experimental results show that the proposed method is suitable for high-speed targets with radial motion, including acceleration and jerk, and that the PDVM precision can reach the order of magnitude of centimeters per second or millimeters per second.
- Published
- 2019
9. A Novel High-Accuracy Phase-Derived Velocity Measurement Method for Wideband LFM Radar
- Author
-
Quanhua Liu, Liyong Guo, Huayu Fan, and Xiaopeng Yang
- Subjects
Physics ,Cross-correlation ,Acoustics ,0211 other engineering and technologies ,Phase (waves) ,02 engineering and technology ,Geotechnical Engineering and Engineering Geology ,Signal ,Discrete Fourier transform ,law.invention ,Acceleration ,Signal-to-noise ratio ,law ,Electrical and Electronic Engineering ,Wideband ,Radar ,021101 geological & geomatics engineering - Abstract
A novel high-accuracy phase-derived velocity measurement (PDVM) method for fast-moving space targets is presented in this letter. First, a wideband linear frequency-modulated signal model that considers the effect of radial acceleration was developed. To obtain the unambiguous phase difference between two adjacent echo pulses, coarse velocity and acceleration measurements derived from range profile cross correlation were used to resolve the phase ambiguity. Then, the derived accurate and unambiguous phase difference and the phase error induced by the discrete Fourier transform were analyzed. The PDVM technique was applied after the phase error was compensated for, and all required parameters were calculated. Under low signal-to-noise ratio (SNR) conditions, a correction for the phase unwrapping error was developed. The simulation results showed that the proposed PDVM technique was highly accurate. The root-mean-square error of the PDVM results was less than 0.025 m/s when the SNR was greater than 15 dB.
- Published
- 2019
10. A High-Precision Method of Phase-Derived Velocity Measurement and Its Application in Motion Compensation of ISAR Imaging
- Author
-
Quanhua Liu, Lixiang Ren, Huayu Fan, and Mao Erke
- Subjects
Motion compensation ,Cross-correlation ,Scattering ,Computer science ,media_common.quotation_subject ,0211 other engineering and technologies ,Phase (waves) ,020206 networking & telecommunications ,02 engineering and technology ,Ambiguity ,Inverse synthetic aperture radar ,Signal-to-noise ratio ,Signal-to-noise ratio (imaging) ,Radar imaging ,0202 electrical engineering, electronic engineering, information engineering ,General Earth and Planetary Sciences ,Electrical and Electronic Engineering ,Envelope (radar) ,Velocity measurement ,Algorithm ,021101 geological & geomatics engineering ,media_common - Abstract
The existing methods for motion compensation in inverse synthetic aperture radar (ISAR) imaging are generally limited to the low-order target motion model, and require iterative optimization with limited velocity estimate precision and heavy computational burdens. This paper proposes a high-precision method of phase-derived velocity measurement (PDVM) and applies it to motion compensation of ISAR imaging. The method applies PDVM based on range profiles cross correlation to the translational velocity estimation of targets, and converts the velocity measurement results to the corresponding range increment. The equivalent phase-derived range measurement precision can reach the order of magnitude of millimeter (mm) or even sub-mm, which can satisfy the precision requirements of both envelope alignment and phase adjustment. The key to realizing PDVM is resolving phase ambiguity. The traditional method for resolving ambiguity has very high requirements for the signal-to-noise ratio (SNR). This work resolves ambiguity by combining multiframe data, i.e., by resolving ambiguity of multiframe data simultaneously instead of resolving ambiguity of single-frame data independently and correcting the above ambiguity-resolving results using a minimum-entropy method. Therefore, phase ambiguity can be correctly resolved under a relatively low SNR. Experimental results of an ISAR imaging of an airplane show that the method proposed in this paper can obtain high-quality ISAR imagery, and can efficiently realize robust imaging under the conditions of low SNR.
- Published
- 2018
11. Design and Processing of a Novel Chaos-Based Stepped Frequency Synthesized Wideband Radar Signal
- Author
-
Tao Zeng, Shaoqiang Chang, Quanhua Liu, and Huayu Fan
- Subjects
Computer science ,Chaotic ,low probability of intercept (LPI) ,02 engineering and technology ,lcsh:Chemical technology ,Biochemistry ,Article ,Analytical Chemistry ,law.invention ,0203 mechanical engineering ,law ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,lcsh:TP1-1185 ,Electrical and Electronic Engineering ,Radar ,Instrumentation ,Low probability of intercept radar ,020301 aerospace & aeronautics ,Frequency-shift keying ,chaotic signal ,stepped frequency ,020206 networking & telecommunications ,Atomic and Molecular Physics, and Optics ,FSK/PSK ,Wideband signal ,Modulation ,Electronic countermeasure ,Frequency-hopping spread spectrum ,Phase-shift keying - Abstract
The linear stepped frequency and linear frequency shift keying (FSK) signal has been widely used in radar systems. However, such linear modulation signals suffer from the range–Doppler coupling that degrades radar multi-target resolution. Moreover, the fixed frequency-hopping or frequency-coded sequence can be easily predicted by the interception receiver in the electronic countermeasures (ECM) environments, which limits radar anti-jamming performance. In addition, the single FSK modulation reduces the radar low probability of intercept (LPI) performance, for it cannot achieve a large time–bandwidth product. To solve such problems, we propose a novel chaos-based stepped frequency (CSF) synthesized wideband signal in this paper. The signal introduces chaotic frequency hopping between the coherent stepped frequency pulses, and adopts a chaotic frequency shift keying (CFSK) and phase shift keying (PSK) composited coded modulation in a subpulse, called CSF-CFSK/PSK. Correspondingly, the processing method for the signal has been proposed. According to our theoretical analyses and the simulations, the proposed signal and processing method achieve better multi-target resolution and LPI performance. Furthermore, flexible modulation is able to increase the robustness against identification of the interception receiver and improve the anti-jamming performance of the radar.
- Published
- 2018
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.