Angle Estimation Based on Wave Path Difference Rate of Change Ambiguity Function
Modern radar systems commonly utilize monopulse angle estimation techniques for target angle estimation, with the phase comparison method being one of the most widely adopted approaches. While the phase comparison method achieves high estimation precision, it is highly susceptible to noise and exhib...
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MDPI AG
2025-03-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/17/5/943 |
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| author | Jianye Xu Maozhong Fu Zhenmiao Deng |
| author_facet | Jianye Xu Maozhong Fu Zhenmiao Deng |
| author_sort | Jianye Xu |
| collection | DOAJ |
| description | Modern radar systems commonly utilize monopulse angle estimation techniques for target angle estimation, with the phase comparison method being one of the most widely adopted approaches. While the phase comparison method achieves high estimation precision, it is highly susceptible to noise and exhibits a suboptimal performance under low Signal-to-Noise Ratio (SNR) conditions, leading to a high SNR threshold. Moreover, conventional monopulse angle estimation methods provide limited target information, as a single measurement cannot reveal the target’s motion direction. To address these shortcomings, a novel approach based on the phase comparison method is proposed in this study, with the variation in the wave path difference modeled as a first-order motion model. By accumulating the conjugate-multiplied signals over multiple time steps, the Wave Path Difference Rate of Change Ambiguity Function (WPD-ROC AF) is constructed. A fast algorithm employing the 2D Chirp-Z Transform (2D-CZT) is proposed, enabling multi-pulse angle estimation through the identification of frequency and phase values corresponding to spectral peaks. Simulation results validate that the proposed method outperforms traditional monopulse angle estimation techniques under low-SNR conditions and effectively suppresses static clutter interference. Furthermore, the sign of the WPD-ROC AF is shown to be correlated with the target’s motion direction, providing practical utility for determining the direction of movement in remote sensing scenarios. |
| format | Article |
| id | doaj-art-b0cde567e2d54a8183729e458b04ad53 |
| institution | OA Journals |
| issn | 2072-4292 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj-art-b0cde567e2d54a8183729e458b04ad532025-08-20T02:06:13ZengMDPI AGRemote Sensing2072-42922025-03-0117594310.3390/rs17050943Angle Estimation Based on Wave Path Difference Rate of Change Ambiguity FunctionJianye Xu0Maozhong Fu1Zhenmiao Deng2School of Electronics and Communication Engineering, Shenzhen Campus, Sun Yat-sen University, Shenzhen 518107, ChinaFujian Key Laboratory of Communication Network and Information Processing, Xiamen University of Technology, Xiamen 361024, ChinaSchool of Electronics and Communication Engineering, Shenzhen Campus, Sun Yat-sen University, Shenzhen 518107, ChinaModern radar systems commonly utilize monopulse angle estimation techniques for target angle estimation, with the phase comparison method being one of the most widely adopted approaches. While the phase comparison method achieves high estimation precision, it is highly susceptible to noise and exhibits a suboptimal performance under low Signal-to-Noise Ratio (SNR) conditions, leading to a high SNR threshold. Moreover, conventional monopulse angle estimation methods provide limited target information, as a single measurement cannot reveal the target’s motion direction. To address these shortcomings, a novel approach based on the phase comparison method is proposed in this study, with the variation in the wave path difference modeled as a first-order motion model. By accumulating the conjugate-multiplied signals over multiple time steps, the Wave Path Difference Rate of Change Ambiguity Function (WPD-ROC AF) is constructed. A fast algorithm employing the 2D Chirp-Z Transform (2D-CZT) is proposed, enabling multi-pulse angle estimation through the identification of frequency and phase values corresponding to spectral peaks. Simulation results validate that the proposed method outperforms traditional monopulse angle estimation techniques under low-SNR conditions and effectively suppresses static clutter interference. Furthermore, the sign of the WPD-ROC AF is shown to be correlated with the target’s motion direction, providing practical utility for determining the direction of movement in remote sensing scenarios.https://www.mdpi.com/2072-4292/17/5/943angle estimationphase comparison methodmulti-pulseWPD-ROC AF |
| spellingShingle | Jianye Xu Maozhong Fu Zhenmiao Deng Angle Estimation Based on Wave Path Difference Rate of Change Ambiguity Function Remote Sensing angle estimation phase comparison method multi-pulse WPD-ROC AF |
| title | Angle Estimation Based on Wave Path Difference Rate of Change Ambiguity Function |
| title_full | Angle Estimation Based on Wave Path Difference Rate of Change Ambiguity Function |
| title_fullStr | Angle Estimation Based on Wave Path Difference Rate of Change Ambiguity Function |
| title_full_unstemmed | Angle Estimation Based on Wave Path Difference Rate of Change Ambiguity Function |
| title_short | Angle Estimation Based on Wave Path Difference Rate of Change Ambiguity Function |
| title_sort | angle estimation based on wave path difference rate of change ambiguity function |
| topic | angle estimation phase comparison method multi-pulse WPD-ROC AF |
| url | https://www.mdpi.com/2072-4292/17/5/943 |
| work_keys_str_mv | AT jianyexu angleestimationbasedonwavepathdifferencerateofchangeambiguityfunction AT maozhongfu angleestimationbasedonwavepathdifferencerateofchangeambiguityfunction AT zhenmiaodeng angleestimationbasedonwavepathdifferencerateofchangeambiguityfunction |