Quadratic Frequency Modulation Signals Parameter Estimation Based on Product High Order Ambiguity Function-Modified Integrated Cubic Phase Function
In inverse synthetic aperture radar (ISAR) imaging system for targets with complex motion, such as ships fluctuating with oceanic waves and high maneuvering airplanes, the multi-component quadratic frequency modulation (QFM) signals are more suitable model for azimuth echo signals. The quadratic chi...
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MDPI AG
2019-04-01
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| Online Access: | https://www.mdpi.com/2078-2489/10/4/140 |
| _version_ | 1811266221165772800 |
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| author | Lei Zhu |
| author_facet | Lei Zhu |
| author_sort | Lei Zhu |
| collection | DOAJ |
| description | In inverse synthetic aperture radar (ISAR) imaging system for targets with complex motion, such as ships fluctuating with oceanic waves and high maneuvering airplanes, the multi-component quadratic frequency modulation (QFM) signals are more suitable model for azimuth echo signals. The quadratic chirp rate (QCR) and chirp rate (CR) cause the ISAR imaging defocus. Thus, it is important to estimate QCR and CR of multi-component QFM signals in ISAR imaging system. The conventional QFM signal parameter estimation algorithms suffer from the cross-term problem. To solve this problem, this paper proposes the product high order ambiguity function-modified integrated cubic phase function (PHAF-MICPF). The PHAF-MICPF employs phase differentiation operation with multi-scale factors and modified coherently integrated cubic phase function (MICPF) to transform the multi-component QFM signals into the time-quadratic chirp rate (T-QCR) domains. The cross-term suppression ability of the PHAF-MICPF is improved by multiplying different T-QCR domains that are related to different scale factors. Besides, the multiplication operation can improve the anti-noise performance and solve the identifiability problem. Compared with high order ambiguity function-integrated cubic phase function (HAF-ICPF), the simulation results verify that the PHAF-MICPF acquires better cross-term suppression ability, better anti-noise performance and solves the identifiability problem. |
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| language | English |
| last_indexed | 2024-04-12T20:39:20Z |
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| spelling | doaj.art-65fd0085cc744a64aefc7d7beed840dc2022-12-22T03:17:28ZengMDPI AGInformation2078-24892019-04-0110414010.3390/info10040140info10040140Quadratic Frequency Modulation Signals Parameter Estimation Based on Product High Order Ambiguity Function-Modified Integrated Cubic Phase FunctionLei Zhu0Jiangsu Automation Research Institute, Lianyungang 222006, ChinaIn inverse synthetic aperture radar (ISAR) imaging system for targets with complex motion, such as ships fluctuating with oceanic waves and high maneuvering airplanes, the multi-component quadratic frequency modulation (QFM) signals are more suitable model for azimuth echo signals. The quadratic chirp rate (QCR) and chirp rate (CR) cause the ISAR imaging defocus. Thus, it is important to estimate QCR and CR of multi-component QFM signals in ISAR imaging system. The conventional QFM signal parameter estimation algorithms suffer from the cross-term problem. To solve this problem, this paper proposes the product high order ambiguity function-modified integrated cubic phase function (PHAF-MICPF). The PHAF-MICPF employs phase differentiation operation with multi-scale factors and modified coherently integrated cubic phase function (MICPF) to transform the multi-component QFM signals into the time-quadratic chirp rate (T-QCR) domains. The cross-term suppression ability of the PHAF-MICPF is improved by multiplying different T-QCR domains that are related to different scale factors. Besides, the multiplication operation can improve the anti-noise performance and solve the identifiability problem. Compared with high order ambiguity function-integrated cubic phase function (HAF-ICPF), the simulation results verify that the PHAF-MICPF acquires better cross-term suppression ability, better anti-noise performance and solves the identifiability problem.https://www.mdpi.com/2078-2489/10/4/140quadratic frequency modulation (QFM) signalparameter estimationphase differentiationmodified integrated cubic phase function (MICPF)multi-scale factors |
| spellingShingle | Lei Zhu Quadratic Frequency Modulation Signals Parameter Estimation Based on Product High Order Ambiguity Function-Modified Integrated Cubic Phase Function Information quadratic frequency modulation (QFM) signal parameter estimation phase differentiation modified integrated cubic phase function (MICPF) multi-scale factors |
| title | Quadratic Frequency Modulation Signals Parameter Estimation Based on Product High Order Ambiguity Function-Modified Integrated Cubic Phase Function |
| title_full | Quadratic Frequency Modulation Signals Parameter Estimation Based on Product High Order Ambiguity Function-Modified Integrated Cubic Phase Function |
| title_fullStr | Quadratic Frequency Modulation Signals Parameter Estimation Based on Product High Order Ambiguity Function-Modified Integrated Cubic Phase Function |
| title_full_unstemmed | Quadratic Frequency Modulation Signals Parameter Estimation Based on Product High Order Ambiguity Function-Modified Integrated Cubic Phase Function |
| title_short | Quadratic Frequency Modulation Signals Parameter Estimation Based on Product High Order Ambiguity Function-Modified Integrated Cubic Phase Function |
| title_sort | quadratic frequency modulation signals parameter estimation based on product high order ambiguity function modified integrated cubic phase function |
| topic | quadratic frequency modulation (QFM) signal parameter estimation phase differentiation modified integrated cubic phase function (MICPF) multi-scale factors |
| url | https://www.mdpi.com/2078-2489/10/4/140 |
| work_keys_str_mv | AT leizhu quadraticfrequencymodulationsignalsparameterestimationbasedonproducthighorderambiguityfunctionmodifiedintegratedcubicphasefunction |