Pub Date : 2015-12-07DOI: 10.1109/EURAD.2015.7346229
A. Reigber, M. Nannini, Antonio Martinez del Hoyo, Gustavo Martin del Campo Becerra, Y. Shkvarko
SAR tomography is a remote sensing technique, extending SAR interferometry, that allows three-dimensional imaging of volumetric targets. It allows, for example, to analyse the vertical structure of vegetation layers or other targets with significant penetration of the sensor's radiation (dry soil, ice layers, etc.). The ability to monitor the 3-D inner structure of volumetric targets and to extract information about the nature and location of ongoing scattering processes promises a break-through in key environmental problems. Indeed, structural parameters of volume scatterers in the biosphere and cryosphere, such as vegetation height and moisture content, forest vertical structure and biomass, or snow / ice depth and layering are critical inputs for ecological process modelling and enable effective monitoring of ecosystem change. Due to its unique capabilities and potential, SAR tomography has gained significant attention during the last years and become an established technique for analysis of all kinds of three-dimensional backscattering scenarios. In particular, for future space-borne SAR sensors operating in longer wavelength, like BIOMASS, SAOCOM-CS or Tandem-L, it is planned to employ 3-D tomographic imaging modes on an operational basis. This paper reviews the different state-of-the-art signal processing methods for three-dimensional SAR imaging. It thereby focuses on techniques suitable for imaging of distributed scenarios, i.e. natural targets which possess a continuous distribution of scatterers along the vertical axis (e.g. vegetation) and which are not only composed of few prominent point scatterers (e.g. layover scenarios). The requirements, advantages and disadvantages of different techniques are assessed and their imaging capabilities are demonstrated using air-borne SAR data.
{"title":"A comparative study of tomographic SAR focusing methods","authors":"A. Reigber, M. Nannini, Antonio Martinez del Hoyo, Gustavo Martin del Campo Becerra, Y. Shkvarko","doi":"10.1109/EURAD.2015.7346229","DOIUrl":"https://doi.org/10.1109/EURAD.2015.7346229","url":null,"abstract":"SAR tomography is a remote sensing technique, extending SAR interferometry, that allows three-dimensional imaging of volumetric targets. It allows, for example, to analyse the vertical structure of vegetation layers or other targets with significant penetration of the sensor's radiation (dry soil, ice layers, etc.). The ability to monitor the 3-D inner structure of volumetric targets and to extract information about the nature and location of ongoing scattering processes promises a break-through in key environmental problems. Indeed, structural parameters of volume scatterers in the biosphere and cryosphere, such as vegetation height and moisture content, forest vertical structure and biomass, or snow / ice depth and layering are critical inputs for ecological process modelling and enable effective monitoring of ecosystem change. Due to its unique capabilities and potential, SAR tomography has gained significant attention during the last years and become an established technique for analysis of all kinds of three-dimensional backscattering scenarios. In particular, for future space-borne SAR sensors operating in longer wavelength, like BIOMASS, SAOCOM-CS or Tandem-L, it is planned to employ 3-D tomographic imaging modes on an operational basis. This paper reviews the different state-of-the-art signal processing methods for three-dimensional SAR imaging. It thereby focuses on techniques suitable for imaging of distributed scenarios, i.e. natural targets which possess a continuous distribution of scatterers along the vertical axis (e.g. vegetation) and which are not only composed of few prominent point scatterers (e.g. layover scenarios). The requirements, advantages and disadvantages of different techniques are assessed and their imaging capabilities are demonstrated using air-borne SAR data.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127551414","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 : 2015-12-07DOI: 10.1109/EURAD.2015.7346365
P. Tokarsky, A. Konovalenko, I. Falkovich, S. Yerin
Giant Ukrainian Radio Telescope (GURT) is a low-frequency one with active phased antenna array, which is being built in Ukraine in addition to the existing UTR-2 radio telescope. In this paper we consider the signal-to-noise ratio in active antenna, which is used as an element of GURT radio telescope antenna array. The sensitivity of the element mainly determines the sensitivity of not only the entire antenna array, but of the whole radio telescope, too. The research technique and the results of numerical calculations are given.
{"title":"SNR in active receiving antenna used as an element of phased antenna array for GURT Radio Telescope","authors":"P. Tokarsky, A. Konovalenko, I. Falkovich, S. Yerin","doi":"10.1109/EURAD.2015.7346365","DOIUrl":"https://doi.org/10.1109/EURAD.2015.7346365","url":null,"abstract":"Giant Ukrainian Radio Telescope (GURT) is a low-frequency one with active phased antenna array, which is being built in Ukraine in addition to the existing UTR-2 radio telescope. In this paper we consider the signal-to-noise ratio in active antenna, which is used as an element of GURT radio telescope antenna array. The sensitivity of the element mainly determines the sensitivity of not only the entire antenna array, but of the whole radio telescope, too. The research technique and the results of numerical calculations are given.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129078198","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 : 2015-12-07DOI: 10.1109/EURAD.2015.7346242
Samir-Mohamad Omar, F. Kassem, Rita Mitri, Hussein Hijazi, Moustafa Saleh
Several algorithms are currently provided to alleviate effects of range overlaid echoes and velocity aliasing in the radar. In this paper, a novel and simple, yet very effective method based on Barker code is presented to solve the range ambiguity problem in high PRF radars. The novelty of this algorithm is derived from the fact that each transmitted pulse is coded with a different circular shifted version of Barker code of length four. Encoding the transmitted pulses in such a way provides the receiver of the potential to resolve up to four overlaid pulses. The direct consequence of this capability is the augmentation of the unambiguous range up to four times. On the top of that, the traditional goal of using the Barker code namely, enhancing the range resolution of the radar is still maintained. To prove the superiority of our algorithm over the existing algorithms in the literature, we conduct some simulations in the context of weather radars. The results indicate obviously that our algorithm outperforms the SZ phase coding technique. The latter has been considered as the one that yields the best performance among its competitors within the family of phase coding techniques.
{"title":"A novel barker code algorithm for resolving range ambiguity in high PRF radars","authors":"Samir-Mohamad Omar, F. Kassem, Rita Mitri, Hussein Hijazi, Moustafa Saleh","doi":"10.1109/EURAD.2015.7346242","DOIUrl":"https://doi.org/10.1109/EURAD.2015.7346242","url":null,"abstract":"Several algorithms are currently provided to alleviate effects of range overlaid echoes and velocity aliasing in the radar. In this paper, a novel and simple, yet very effective method based on Barker code is presented to solve the range ambiguity problem in high PRF radars. The novelty of this algorithm is derived from the fact that each transmitted pulse is coded with a different circular shifted version of Barker code of length four. Encoding the transmitted pulses in such a way provides the receiver of the potential to resolve up to four overlaid pulses. The direct consequence of this capability is the augmentation of the unambiguous range up to four times. On the top of that, the traditional goal of using the Barker code namely, enhancing the range resolution of the radar is still maintained. To prove the superiority of our algorithm over the existing algorithms in the literature, we conduct some simulations in the context of weather radars. The results indicate obviously that our algorithm outperforms the SZ phase coding technique. The latter has been considered as the one that yields the best performance among its competitors within the family of phase coding techniques.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"67 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131410800","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 : 2015-12-07DOI: 10.1109/EURAD.2015.7346233
N. Petrov, F. Le Chevalier
In this paper the problem of unambiguous target detection with wideband radar is discussed. A range migration phenomenon is used to resolve Doppler ambiguities present in low pulse repetition frequency mode. Iterative Adaptive Approach is applied to solve this problem and shown to be an attractive solution. Capability of the proposed processing is shown via numerical simulations. Experimental data sets demonstrate 25 dB improvement in detection performance of a moving target at the first blind velocity.
{"title":"Iterative adaptive approach for unambiguous wideband radar target detection","authors":"N. Petrov, F. Le Chevalier","doi":"10.1109/EURAD.2015.7346233","DOIUrl":"https://doi.org/10.1109/EURAD.2015.7346233","url":null,"abstract":"In this paper the problem of unambiguous target detection with wideband radar is discussed. A range migration phenomenon is used to resolve Doppler ambiguities present in low pulse repetition frequency mode. Iterative Adaptive Approach is applied to solve this problem and shown to be an attractive solution. Capability of the proposed processing is shown via numerical simulations. Experimental data sets demonstrate 25 dB improvement in detection performance of a moving target at the first blind velocity.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134076232","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 : 2015-12-07DOI: 10.1109/EURAD.2015.7346250
Hao Ding, Yong Huang, Ningbo Liu, Yonghua Xue, Guoqing Wang
For high resolution radar at low grazing angles, the existence of strong sea spikes leads to long tails in the amplitude distribution of sea clutter. The accurate modeling of sea clutter amplitude distribution in the presence of sea spikes is the main contribution of this paper. Considering the impulsive nature of sea spike events, the generalized extreme value (GEV) distribution, which originated from extreme value theory (EVT), is adopted in the modeling. Final distribution models are proposed by adding a compound Gaussian component in the GEV model to account for the contribution of non-spike samples. Validation results with measured data indicate that the proposed models can achieve satisfactory performance improvement in describing the statistical distribution of spiky sea clutter, especially in the tail region.
{"title":"Modeling of sea spike events with generalized extreme value distribution","authors":"Hao Ding, Yong Huang, Ningbo Liu, Yonghua Xue, Guoqing Wang","doi":"10.1109/EURAD.2015.7346250","DOIUrl":"https://doi.org/10.1109/EURAD.2015.7346250","url":null,"abstract":"For high resolution radar at low grazing angles, the existence of strong sea spikes leads to long tails in the amplitude distribution of sea clutter. The accurate modeling of sea clutter amplitude distribution in the presence of sea spikes is the main contribution of this paper. Considering the impulsive nature of sea spike events, the generalized extreme value (GEV) distribution, which originated from extreme value theory (EVT), is adopted in the modeling. Final distribution models are proposed by adding a compound Gaussian component in the GEV model to account for the contribution of non-spike samples. Validation results with measured data indicate that the proposed models can achieve satisfactory performance improvement in describing the statistical distribution of spiky sea clutter, especially in the tail region.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123927199","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 : 2015-12-07DOI: 10.1109/EURAD.2015.7346245
J. Kurdzo, R. Palmer, B. Cheong, M. Weber
Multi-sector arrays have been used for decades, including applications on ships, aircraft, vehicles, and ground-based platforms. In most of these applications, however, spatial isolation generated through the use of strategic sector placement has provided sufficient overall isolation between each sector. The United States has recently been exploring the potential for a multi-function phased array radar (MPAR) network that would provide surveillance, tracking, and detection capabilities for the nation's weather, terminal weather, and national airspace missions. Several studies have assumed a multi-sector approach on a single platform. With the goal of allowing each sector to independently operate, concerns regarding isolation between the sectors have introduced the desire to gain additional isolation through waveform design. Recent advances in frequency-modulated pulse compression techniques have afforded the ability to maximize sensitivity and sidelobe performance within a given time-bandwidth specification; however, waveform design has the potential to bring numerous other spectral efficiency advancements to the MPAR mission. A generalization of recent waveform design techniques into a multi-sector waveform group is presented. Simulations of a four-sector waveform group are carried out and optimized for minimal interference. The ability to achieve high waveform-based isolation is combined with varying spatial isolations and slight frequency offsets to drastically reduce overall spectrum usage for a multi-sector array.
{"title":"Adaptive waveform design for multi-sector array isolation","authors":"J. Kurdzo, R. Palmer, B. Cheong, M. Weber","doi":"10.1109/EURAD.2015.7346245","DOIUrl":"https://doi.org/10.1109/EURAD.2015.7346245","url":null,"abstract":"Multi-sector arrays have been used for decades, including applications on ships, aircraft, vehicles, and ground-based platforms. In most of these applications, however, spatial isolation generated through the use of strategic sector placement has provided sufficient overall isolation between each sector. The United States has recently been exploring the potential for a multi-function phased array radar (MPAR) network that would provide surveillance, tracking, and detection capabilities for the nation's weather, terminal weather, and national airspace missions. Several studies have assumed a multi-sector approach on a single platform. With the goal of allowing each sector to independently operate, concerns regarding isolation between the sectors have introduced the desire to gain additional isolation through waveform design. Recent advances in frequency-modulated pulse compression techniques have afforded the ability to maximize sensitivity and sidelobe performance within a given time-bandwidth specification; however, waveform design has the potential to bring numerous other spectral efficiency advancements to the MPAR mission. A generalization of recent waveform design techniques into a multi-sector waveform group is presented. Simulations of a four-sector waveform group are carried out and optimized for minimal interference. The ability to achieve high waveform-based isolation is combined with varying spatial isolations and slight frequency offsets to drastically reduce overall spectrum usage for a multi-sector array.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126166635","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 : 2015-12-07DOI: 10.1109/EURAD.2015.7346248
Amer Melebari, A. Mishra, M. Y. Abdul Gaffar
A priori knowledge of the clutter statistics is required in maximizing a radar detection range. Much research has been done in analyzing various types of land clutter terrains including urban, forest and crops terrains. However, analysis of palm trees terrain has not been addressed in the open literature. Palm trees have a unique structure, which make them different from other type of trees. Date farms usually consists of date palm trees and scattered small buildings. In this paper, the clutter statistics of date farms terrain were analyzed. The amplitude Probability Distribution Function (PDF) was fitted to different distributions and the Power Spectral Density (PSD) was analyzed using Chan's model. It was found that the amplitude PDF of date farms terrain can be best modelled by a Log-normal distribution. The clutter statistics properties, which can be estimated from measured clutter, can be used in generating simulated clutter samples. Simulated clutter can be used in assessing detection algorithms in the presence of clutter. Generating simulated land clutter with similar statistics to the measured clutter is a challenge. In this paper, simulated clutter samples were generated using a PSD based model. The radar clutter simulator generated complex samples with a PSD similar to the measured clutter, but the amplitude PDF was different. The amplitude PDF of the measured clutter was observed to have a longer tail compared to the simulated clutter.
{"title":"Statistical analysis of measured high resolution land clutter at X-band and clutter simulation","authors":"Amer Melebari, A. Mishra, M. Y. Abdul Gaffar","doi":"10.1109/EURAD.2015.7346248","DOIUrl":"https://doi.org/10.1109/EURAD.2015.7346248","url":null,"abstract":"A priori knowledge of the clutter statistics is required in maximizing a radar detection range. Much research has been done in analyzing various types of land clutter terrains including urban, forest and crops terrains. However, analysis of palm trees terrain has not been addressed in the open literature. Palm trees have a unique structure, which make them different from other type of trees. Date farms usually consists of date palm trees and scattered small buildings. In this paper, the clutter statistics of date farms terrain were analyzed. The amplitude Probability Distribution Function (PDF) was fitted to different distributions and the Power Spectral Density (PSD) was analyzed using Chan's model. It was found that the amplitude PDF of date farms terrain can be best modelled by a Log-normal distribution. The clutter statistics properties, which can be estimated from measured clutter, can be used in generating simulated clutter samples. Simulated clutter can be used in assessing detection algorithms in the presence of clutter. Generating simulated land clutter with similar statistics to the measured clutter is a challenge. In this paper, simulated clutter samples were generated using a PSD based model. The radar clutter simulator generated complex samples with a PSD similar to the measured clutter, but the amplitude PDF was different. The amplitude PDF of the measured clutter was observed to have a longer tail compared to the simulated clutter.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130107886","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 : 2015-12-07DOI: 10.1109/EURAD.2015.7346275
F. Meinl, E. Schubert, M. Kunert, H. Blume
Next generations of high-resolution automotive radar sensors rely on powerful, real-time capable processing units. High sampling rates, large antenna arrays as well as hard real-time constraints require the use of both parallel architectures and high-bandwidth memory interfaces. This paper presents a novel architecture of a FPGA-based multiple-input multiple-output (MIMO) radar sensor processing unit. Sampling rates up to 250 MSPS and a maximum of 16 parallel receiving channels can be used, resulting in a maximum data rate of 56GBit/s. The processing chain consists of a flexible FIR filter, a range-Doppler processing unit using windowed FFTs and an ordered statistics constant-false-alarm-rate (OS-CFAR) unit for optimal target detection and data reduction. The realized target system is composed of a Virtex7-FPGA and a 1GByte SDRAM memory. The resource usage of the FPGA implementation is analyzed in order to provide estimations for future system designs. Finally, the resulting performance of the system is verified in connection with a prototype MIMO radar front-end. High-resolution measurements of moving scenes have been carried out to validate the correct operation of the system.
{"title":"Realtime FPGA-based processing unit for a high-resolution automotive MIMO radar platform","authors":"F. Meinl, E. Schubert, M. Kunert, H. Blume","doi":"10.1109/EURAD.2015.7346275","DOIUrl":"https://doi.org/10.1109/EURAD.2015.7346275","url":null,"abstract":"Next generations of high-resolution automotive radar sensors rely on powerful, real-time capable processing units. High sampling rates, large antenna arrays as well as hard real-time constraints require the use of both parallel architectures and high-bandwidth memory interfaces. This paper presents a novel architecture of a FPGA-based multiple-input multiple-output (MIMO) radar sensor processing unit. Sampling rates up to 250 MSPS and a maximum of 16 parallel receiving channels can be used, resulting in a maximum data rate of 56GBit/s. The processing chain consists of a flexible FIR filter, a range-Doppler processing unit using windowed FFTs and an ordered statistics constant-false-alarm-rate (OS-CFAR) unit for optimal target detection and data reduction. The realized target system is composed of a Virtex7-FPGA and a 1GByte SDRAM memory. The resource usage of the FPGA implementation is analyzed in order to provide estimations for future system designs. Finally, the resulting performance of the system is verified in connection with a prototype MIMO radar front-end. High-resolution measurements of moving scenes have been carried out to validate the correct operation of the system.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134609337","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 : 2015-12-07DOI: 10.1109/EURAD.2015.7346236
C. Enderli, Marc Montécot, Thierry Sfez, M. Schaub
We describe an original way to realize air/air and air/ground radar detection modes simultaneously with a single sub-arrayed antenna of an airborne radar system. Co-located MIMO techniques a.k.a. colored transmission are natural candidates to address this problem, however in an airborne context the angular coverage enlargement they provide is not enough to explore the nominal search domain associated to the functions to be implemented. The solution described in this work consists in subdividing the antenna into two transmitting sub-arrays; Unlike classical MIMO techniques, the pulse repetition interval and the pulse durations are not constrained to be the same in all the transmitted waveforms, which allows the re-use of already developed, qualified, and operation-proven waveforms (@Thales patented). On the receiving side, assuming a sufficient number of Rx sub-arrays, ground clutter echoes can be mitigated with STAP. Since signal reception in a sub-array is not possible during transmission through another one, missing data in receiving channels yield specific signal processing issues. New results are provided with the example of the AMSAR antenna architecture, and comparisons are made with other methods based on interpolation with autoregressive models when missing data are due to e.g. intermittent jamming or interactions.
{"title":"Simultaneous air/air and air/ground radar modes with a single antenna","authors":"C. Enderli, Marc Montécot, Thierry Sfez, M. Schaub","doi":"10.1109/EURAD.2015.7346236","DOIUrl":"https://doi.org/10.1109/EURAD.2015.7346236","url":null,"abstract":"We describe an original way to realize air/air and air/ground radar detection modes simultaneously with a single sub-arrayed antenna of an airborne radar system. Co-located MIMO techniques a.k.a. colored transmission are natural candidates to address this problem, however in an airborne context the angular coverage enlargement they provide is not enough to explore the nominal search domain associated to the functions to be implemented. The solution described in this work consists in subdividing the antenna into two transmitting sub-arrays; Unlike classical MIMO techniques, the pulse repetition interval and the pulse durations are not constrained to be the same in all the transmitted waveforms, which allows the re-use of already developed, qualified, and operation-proven waveforms (@Thales patented). On the receiving side, assuming a sufficient number of Rx sub-arrays, ground clutter echoes can be mitigated with STAP. Since signal reception in a sub-array is not possible during transmission through another one, missing data in receiving channels yield specific signal processing issues. New results are provided with the example of the AMSAR antenna architecture, and comparisons are made with other methods based on interpolation with autoregressive models when missing data are due to e.g. intermittent jamming or interactions.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"26 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114001516","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 : 2015-12-07DOI: 10.1109/EURAD.2015.7346325
H. Abou Taam, A. Siblini, G. E. El Nashef, B. Jecko, E. Arnaud, N. Chevalier, M. Rammal
Telecommunications, civil and military radars, RFID (Radio Frequency IDentification) and all the radiating systems are evolving towards the spatial agility that associates ≪range≫ and ≪coverage≫. In this context, this article describes and demonstrates an experimental prototype to show the reliability and efficiency of the EBG matrix antenna theoretical aspect, for beam forming and beam steering applications.
{"title":"An agile electronically scanned EBG matrix antenna for monitoring target activity","authors":"H. Abou Taam, A. Siblini, G. E. El Nashef, B. Jecko, E. Arnaud, N. Chevalier, M. Rammal","doi":"10.1109/EURAD.2015.7346325","DOIUrl":"https://doi.org/10.1109/EURAD.2015.7346325","url":null,"abstract":"Telecommunications, civil and military radars, RFID (Radio Frequency IDentification) and all the radiating systems are evolving towards the spatial agility that associates ≪range≫ and ≪coverage≫. In this context, this article describes and demonstrates an experimental prototype to show the reliability and efficiency of the EBG matrix antenna theoretical aspect, for beam forming and beam steering applications.","PeriodicalId":376019,"journal":{"name":"2015 European Radar Conference (EuRAD)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121375639","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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