Pub Date : 2016-10-01DOI: 10.1109/RADAR.2016.8059391
Xinzhu Chen, Ting Shu, K. Yu, Wenxian Yu
For modern phased array radar, wideband system has been developed for the benefits of fine resolution. However, it introduces two main challenges, wideband digital beamforming and wideband adaptive digital beamforming for jamming cancellation. A typical architecture of wideband adaptive digital beamforming consists of time delay compensation using fractional delay filter at baseband followed by subband decomposition and narrowband adaptive digital beamforming. This processing scheme has achieved precise beam steering and good jamming cancellation performance over wideband. In this paper, a novel architecture is proposed by incorporating time delay compensation at digital beamforming in each subband. Without wideband time delay compensation explicitly, different steering vector is applied instead in different subband accordingly, in order to maintain the beam steering accuracy. Additionally, the computation burden is significantly reduced by eliminating the fractional delay filters. Simulation of the typical and novel processing schemes are carried out for comparison. The numerical results show that the novel method can achieve as good performance as the typical method at lower expense of computational throughput, which validates the efficiency of the proposed architecture.
{"title":"Efficient time delay compensation at beamforming using subband decomposition for wideband phased array radar","authors":"Xinzhu Chen, Ting Shu, K. Yu, Wenxian Yu","doi":"10.1109/RADAR.2016.8059391","DOIUrl":"https://doi.org/10.1109/RADAR.2016.8059391","url":null,"abstract":"For modern phased array radar, wideband system has been developed for the benefits of fine resolution. However, it introduces two main challenges, wideband digital beamforming and wideband adaptive digital beamforming for jamming cancellation. A typical architecture of wideband adaptive digital beamforming consists of time delay compensation using fractional delay filter at baseband followed by subband decomposition and narrowband adaptive digital beamforming. This processing scheme has achieved precise beam steering and good jamming cancellation performance over wideband. In this paper, a novel architecture is proposed by incorporating time delay compensation at digital beamforming in each subband. Without wideband time delay compensation explicitly, different steering vector is applied instead in different subband accordingly, in order to maintain the beam steering accuracy. Additionally, the computation burden is significantly reduced by eliminating the fractional delay filters. Simulation of the typical and novel processing schemes are carried out for comparison. The numerical results show that the novel method can achieve as good performance as the typical method at lower expense of computational throughput, which validates the efficiency of the proposed architecture.","PeriodicalId":245387,"journal":{"name":"2016 CIE International Conference on Radar (RADAR)","volume":"23 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131638592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-01DOI: 10.1109/RADAR.2016.8059582
Yang Pengcheng, Lu Xiaode
Periodic system modulation which has been observed in experimental data may have an effect on passive radar system performance. Its influence on clutter cancellation and coherent integration is analyzed. In addition, how the periodic side peaks in Doppler dimension of cross ambiguity function (CAF) produe is explained. These analyses are verified by simulations. Analyses of experimental data show that the modulation is weak and its influence on system performance is trivial. With the checking of passive radar system, power module which supplies the system with 50Hz alternating current is lastly verified as the source of this modulation.
{"title":"Analysis of the effect of periodic system modulation on passive radar system performance","authors":"Yang Pengcheng, Lu Xiaode","doi":"10.1109/RADAR.2016.8059582","DOIUrl":"https://doi.org/10.1109/RADAR.2016.8059582","url":null,"abstract":"Periodic system modulation which has been observed in experimental data may have an effect on passive radar system performance. Its influence on clutter cancellation and coherent integration is analyzed. In addition, how the periodic side peaks in Doppler dimension of cross ambiguity function (CAF) produe is explained. These analyses are verified by simulations. Analyses of experimental data show that the modulation is weak and its influence on system performance is trivial. With the checking of passive radar system, power module which supplies the system with 50Hz alternating current is lastly verified as the source of this modulation.","PeriodicalId":245387,"journal":{"name":"2016 CIE International Conference on Radar (RADAR)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127323074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-01DOI: 10.1109/RADAR.2016.8059201
Chen Yong-bin, Lin Shao-dong, Yang Jun
Micro-motion modulation caused by multi-rotor can be used as an important feature to identify different types of multi-rotor aircrafts. In this paper, modeling and systematical research on micro-motion modulation characteristics of multi-rotor aircraft's rotors is studied. Firstly, the mathematic model of multi-rotor aircraft's rotors is proposed. Secondly, time-domain characteristics and micro-Doppler (m-D) signature of rotors are analyzed based on this model. Finally, the micro-motion modulation characteristics of various multi-rotor aircraft's rotors, which are compared with that of single-rotor, are simulated and studied. Simulation results show that there is a clear distinction of the m-D signatures among different types of multi-rotor aircraft's rotors, which can provide a theoretical basis for the classification of multi-rotor aircrafts.
{"title":"Research on micro-motion modulation characteristics of multi-rotor aircraft's rotors","authors":"Chen Yong-bin, Lin Shao-dong, Yang Jun","doi":"10.1109/RADAR.2016.8059201","DOIUrl":"https://doi.org/10.1109/RADAR.2016.8059201","url":null,"abstract":"Micro-motion modulation caused by multi-rotor can be used as an important feature to identify different types of multi-rotor aircrafts. In this paper, modeling and systematical research on micro-motion modulation characteristics of multi-rotor aircraft's rotors is studied. Firstly, the mathematic model of multi-rotor aircraft's rotors is proposed. Secondly, time-domain characteristics and micro-Doppler (m-D) signature of rotors are analyzed based on this model. Finally, the micro-motion modulation characteristics of various multi-rotor aircraft's rotors, which are compared with that of single-rotor, are simulated and studied. Simulation results show that there is a clear distinction of the m-D signatures among different types of multi-rotor aircraft's rotors, which can provide a theoretical basis for the classification of multi-rotor aircrafts.","PeriodicalId":245387,"journal":{"name":"2016 CIE International Conference on Radar (RADAR)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121268657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-01DOI: 10.1109/RADAR.2016.8059307
Tingting Qian, Qingquan Meng, Guanghua Lu
For the purpose of obtaining high-resolution in staring correlated imaging radar system, improving the stochastic properties of radiation sources is an effective pathway, while the frequency hopping pattern of transmitting signals is an important parameter that affects the randomness of radiation sources. In this paper, a novel concept of distribution entropy is proposed with its mathematical expression, which quantitatively describes the temporal-spatial stochastic characteristics of microwave radiation sources. Furthermore, five frequency assignment strategies of radiation sources have been designed by using genetic algorithm with the principle of maximizing the distribution entropy. Numerical simulations are performed and the results show that the designed frequency assignment strategy with high distribution entropy will improve the recovery performance of image efficiently.
{"title":"Frequency optimization of radiation sources for correlated imaging radar based on distribution entropy","authors":"Tingting Qian, Qingquan Meng, Guanghua Lu","doi":"10.1109/RADAR.2016.8059307","DOIUrl":"https://doi.org/10.1109/RADAR.2016.8059307","url":null,"abstract":"For the purpose of obtaining high-resolution in staring correlated imaging radar system, improving the stochastic properties of radiation sources is an effective pathway, while the frequency hopping pattern of transmitting signals is an important parameter that affects the randomness of radiation sources. In this paper, a novel concept of distribution entropy is proposed with its mathematical expression, which quantitatively describes the temporal-spatial stochastic characteristics of microwave radiation sources. Furthermore, five frequency assignment strategies of radiation sources have been designed by using genetic algorithm with the principle of maximizing the distribution entropy. Numerical simulations are performed and the results show that the designed frequency assignment strategy with high distribution entropy will improve the recovery performance of image efficiently.","PeriodicalId":245387,"journal":{"name":"2016 CIE International Conference on Radar (RADAR)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127697241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-01DOI: 10.1109/RADAR.2016.8059130
Y. B. Yetkil, S. Demir, B. Dagdeviren, B. Donmez
Height of Burst (HOB) sensor is one of the critical parts in guided missiles. While seekers control the guiding scheme of the missile, proximity sensors set the trigger for increased effectiveness of the warhead. For the well-developed guided missiles of Roketsan, a novel proximity sensor is developed. The design of the sensor is for multi-purpose use. In this presentation, the application of the sensor is explained for operation as a HOB sensor in the range of 3m–50m with ± 1m accuracy. Measurement results are also presented. The same sensor is currently being developed for proximity sensor for missile defence.
{"title":"A precise and compact height of burst sensor for guided missiles","authors":"Y. B. Yetkil, S. Demir, B. Dagdeviren, B. Donmez","doi":"10.1109/RADAR.2016.8059130","DOIUrl":"https://doi.org/10.1109/RADAR.2016.8059130","url":null,"abstract":"Height of Burst (HOB) sensor is one of the critical parts in guided missiles. While seekers control the guiding scheme of the missile, proximity sensors set the trigger for increased effectiveness of the warhead. For the well-developed guided missiles of Roketsan, a novel proximity sensor is developed. The design of the sensor is for multi-purpose use. In this presentation, the application of the sensor is explained for operation as a HOB sensor in the range of 3m–50m with ± 1m accuracy. Measurement results are also presented. The same sensor is currently being developed for proximity sensor for missile defence.","PeriodicalId":245387,"journal":{"name":"2016 CIE International Conference on Radar (RADAR)","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132847516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Polarimetric Multiple-Input Multiple-Output (MIMO) radar has multiple antennas of different polarimetric directions to transmit and receive signals. For signals in four transmit/receive polarimetric channels, the detection performance is studied via three target detection algorithms, i.e., the Bayesian optimal detection, the coherent accumulation detector and the noncoherent accumulation detector, on conditions that radar targets are anisotropy and two cross polarimetric channels have target returns with different amplitudes. It is found that polarimetric MIMO radar is more stable in target detection performance.
{"title":"Polarimetric MIMO radar target detection","authors":"Shenghua Zhou, Xinxun Zhang, Hongwei Liu, Yongbo Zhao","doi":"10.1109/RADAR.2016.8059153","DOIUrl":"https://doi.org/10.1109/RADAR.2016.8059153","url":null,"abstract":"Polarimetric Multiple-Input Multiple-Output (MIMO) radar has multiple antennas of different polarimetric directions to transmit and receive signals. For signals in four transmit/receive polarimetric channels, the detection performance is studied via three target detection algorithms, i.e., the Bayesian optimal detection, the coherent accumulation detector and the noncoherent accumulation detector, on conditions that radar targets are anisotropy and two cross polarimetric channels have target returns with different amplitudes. It is found that polarimetric MIMO radar is more stable in target detection performance.","PeriodicalId":245387,"journal":{"name":"2016 CIE International Conference on Radar (RADAR)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132928441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Based on interferometric processing theory, a three-dimensional (3-D) imaging method for space rotating targets in wideband radar is proposed in this paper. First, the image feature of space rotating targets on range_slow-time plane is analyzed for radar transmitting LFM signal. Then, an interferometric 3-D imaging model upon range_slow-time plane of space rotating targets is established. Furthermore, the issue of overlapped points on range_slow-time plane is analyzed. Finally, simulation results verify the effectiveness of the proposed method. Generally, the method can obtain the real 3-D positions of targets compared with monostatic radar-based imaging methods, while avoiding the difficulty of joint treatment compared with multistatic radar-based imaging methods.
{"title":"An interferometric-processing based three-dimensional imaging method for space rotating targets","authors":"Yu-Xue Sun, Chang-zheng Ma, Ying Luo, Yong-zhao Lin, Yong-an Chen, Qun Zhang","doi":"10.1109/RADAR.2016.8059212","DOIUrl":"https://doi.org/10.1109/RADAR.2016.8059212","url":null,"abstract":"Based on interferometric processing theory, a three-dimensional (3-D) imaging method for space rotating targets in wideband radar is proposed in this paper. First, the image feature of space rotating targets on range_slow-time plane is analyzed for radar transmitting LFM signal. Then, an interferometric 3-D imaging model upon range_slow-time plane of space rotating targets is established. Furthermore, the issue of overlapped points on range_slow-time plane is analyzed. Finally, simulation results verify the effectiveness of the proposed method. Generally, the method can obtain the real 3-D positions of targets compared with monostatic radar-based imaging methods, while avoiding the difficulty of joint treatment compared with multistatic radar-based imaging methods.","PeriodicalId":245387,"journal":{"name":"2016 CIE International Conference on Radar (RADAR)","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132937735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-01DOI: 10.1109/RADAR.2016.8059312
Lei Ran, Zheng Liu, Zhang Tao, Tao Li
The back-projection (BP) algorithm is an ideal solution for airborne synthetic aperture radar (SAR) imaging. However, trajectory deviations degrade BP focusing performance dramatically due to the accuracy limitation of navigation system. In this paper, we propose a novel autofocus method compatible with the BP imagery, which can correct the 3D trajectory deviations. In the new method, multiple local images at different illumination directions within the radar beam are synthesized to trace the local phase gradient. From these phase gradient estimates, accurate trajectory update can be achieved. Experiment based on highly squinted SAR data validates the effectiveness of the proposed autofocus method.
{"title":"Autofocus for correcting three dimensional trajectory deviations in synthetic aperture radar","authors":"Lei Ran, Zheng Liu, Zhang Tao, Tao Li","doi":"10.1109/RADAR.2016.8059312","DOIUrl":"https://doi.org/10.1109/RADAR.2016.8059312","url":null,"abstract":"The back-projection (BP) algorithm is an ideal solution for airborne synthetic aperture radar (SAR) imaging. However, trajectory deviations degrade BP focusing performance dramatically due to the accuracy limitation of navigation system. In this paper, we propose a novel autofocus method compatible with the BP imagery, which can correct the 3D trajectory deviations. In the new method, multiple local images at different illumination directions within the radar beam are synthesized to trace the local phase gradient. From these phase gradient estimates, accurate trajectory update can be achieved. Experiment based on highly squinted SAR data validates the effectiveness of the proposed autofocus method.","PeriodicalId":245387,"journal":{"name":"2016 CIE International Conference on Radar (RADAR)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133317422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-01DOI: 10.1109/RADAR.2016.8059451
H.-T. Zhang, W. Wang, M. Jin, X.-P Lu
This paper describes a Ka-band active phased array antenna for mobile satellite communications stations. The active phased array is a fully electronic beam-scanning antenna system and is the most technically challenging component in the system development of the Chinese engineering test satellite, comets. The antenna array is designed to circularly polarization for satellite communications.
{"title":"An active phased array antenna for broadband mobile satellite communications at ka-band","authors":"H.-T. Zhang, W. Wang, M. Jin, X.-P Lu","doi":"10.1109/RADAR.2016.8059451","DOIUrl":"https://doi.org/10.1109/RADAR.2016.8059451","url":null,"abstract":"This paper describes a Ka-band active phased array antenna for mobile satellite communications stations. The active phased array is a fully electronic beam-scanning antenna system and is the most technically challenging component in the system development of the Chinese engineering test satellite, comets. The antenna array is designed to circularly polarization for satellite communications.","PeriodicalId":245387,"journal":{"name":"2016 CIE International Conference on Radar (RADAR)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132294646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-01DOI: 10.1109/RADAR.2016.8059470
Jiancheng Zhang, T. Su
The detection and motion parameter estimation performance of a high-speed maneuvering target with a fixed acceleration is affected by the range migration (RM) and Doppler frequency migration (DFM). To address these problems, a fast non-searching algorithm is proposed. Firstly, the second-order keystone transform (SKT) is applied to remove the quadratic coupling between the range frequency and slow-time. Thereafter, by defining a novel symmetric autocorrelation function (SAF), the target's radial velocity and acceleration can be estimated simultaneously. With these estimates, a compensation function is constructed to compensate the RM and DFM, followed by the azimuth FFT operation to realize the coherent integration. The computational complexity can be greatly reduced due to the searching procedure has been eliminated. The simulation results demonstrate the effectiveness of the proposed method.
{"title":"High-speed maneuvering target detection and motion parameter estimation","authors":"Jiancheng Zhang, T. Su","doi":"10.1109/RADAR.2016.8059470","DOIUrl":"https://doi.org/10.1109/RADAR.2016.8059470","url":null,"abstract":"The detection and motion parameter estimation performance of a high-speed maneuvering target with a fixed acceleration is affected by the range migration (RM) and Doppler frequency migration (DFM). To address these problems, a fast non-searching algorithm is proposed. Firstly, the second-order keystone transform (SKT) is applied to remove the quadratic coupling between the range frequency and slow-time. Thereafter, by defining a novel symmetric autocorrelation function (SAF), the target's radial velocity and acceleration can be estimated simultaneously. With these estimates, a compensation function is constructed to compensate the RM and DFM, followed by the azimuth FFT operation to realize the coherent integration. The computational complexity can be greatly reduced due to the searching procedure has been eliminated. The simulation results demonstrate the effectiveness of the proposed method.","PeriodicalId":245387,"journal":{"name":"2016 CIE International Conference on Radar (RADAR)","volume":"303 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134123503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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