Proceedings of the IEEE 1995 National Aerospace and Electronics Conference. NAECON 1995最新文献

{"title":"Closed-loop voltage-mode-controlled PWM flyback dc-dc converter for CCM with integral-lead controller","authors":"M. Kazimierczuk, S. T. Nguyen","doi":"10.1109/NAECON.1995.521913","DOIUrl":"https://doi.org/10.1109/NAECON.1995.521913","url":null,"abstract":"This paper presents an analysis of a closed-loop voltage-mode-controlled pulse-width-modulated (PWM) flyback dc-dc converter for continuous conduction mode with an integral-lead controller. An integral-lead controller is designed so that it completely meets the system specifications. The closed-loop dynamic performance of the system is analyzed. The Bode plots are illustrated for closed-loop control-to-output transfer function, input-to-output transfer function, input impedance, and output impedance. Tile system stability is evaluated with the results of 45/spl deg/ for the phase margin at the crossover frequency of 2.5 kHz, and 6 dB for the gain margin at a frequency of 5 kHz at a duty cycle of 0.45.","PeriodicalId":171918,"journal":{"name":"Proceedings of the IEEE 1995 National Aerospace and Electronics Conference. NAECON 1995","volume":"831 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133279566","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}

{"title":"Multiple moving target resolution and imaging based on ISAR principle","authors":"Zhaoda Zhu, Z. She, Jianjiang Zhou","doi":"10.1109/NAECON.1995.522057","DOIUrl":"https://doi.org/10.1109/NAECON.1995.522057","url":null,"abstract":"The fine relative motion strongly affect the resolution capability of standard ISAR processing for multiple moving targets without gross relative motion. For multiple targets with gross relative motion, two methods, based on time-frequency analysis and maximum likelihood principle respectively, are proposed to resolve and image the targets. Simulation results to verify the methods are also given.","PeriodicalId":171918,"journal":{"name":"Proceedings of the IEEE 1995 National Aerospace and Electronics Conference. NAECON 1995","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115202497","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}

{"title":"The locally optimum detectors in clutter characterized as SIRP","authors":"Jinsong Tang, Zhaoda Zhu","doi":"10.1109/NAECON.1995.521946","DOIUrl":"https://doi.org/10.1109/NAECON.1995.521946","url":null,"abstract":"The high resolution radar is plagued by target-like \"spikes\" that give rise to non-Gaussian observation and much higher false alarm rate than that of system can tolerate. Several models have been presented to characterize the clutter, and the more attractive one maybe is spherically invariant random process (SIRP). The paper discusses the locally optimum detectors against clutter characterized as SIRP for coherent pulse train with known and unknown initial phase and non-coherent pulse train, which have simple and elegant structure. The performances of three detectors are analyzed in the paper.","PeriodicalId":171918,"journal":{"name":"Proceedings of the IEEE 1995 National Aerospace and Electronics Conference. NAECON 1995","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115512930","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}

{"title":"A new algorithm for multiple targets tracking in bistatic radar system","authors":"Cheng Yongguang, S. Zhongkang","doi":"10.1109/NAECON.1995.521934","DOIUrl":"https://doi.org/10.1109/NAECON.1995.521934","url":null,"abstract":"This paper presents an algorithm for multiple targets tracking. The bistatic radar system proposed in the paper contains a T/R station and a R station. Generally the T/R station provides data such as azimuth angle and distance of a target while the R station has measurement of azimuth angle and distance sum of the target. After coordinate conversion and target locating the measurement data is converted into 3-D coordinate position of the target. In order to track multi-targets it is important to select data association method. In the paper according to conditions of real-time system we accomplish multiple targets tracking in two stages. In the first stage the locating data of a target is used to do association with every target data stored in last tracking cycle. It is necessary to finish this stage as soon as we get the target's locating data due to the demand of real-time system. However association error sometimes happens in stage one. Therefore we decide to test the association result of stage one. When R station passes the observation field in every cycle, the second tracking stage begins so as to correct the association result of stage one. It has proved that the performance of T/R-R system m multiple targets tracking is greatly improved because of the new tracking algorithm discussed in this paper.","PeriodicalId":171918,"journal":{"name":"Proceedings of the IEEE 1995 National Aerospace and Electronics Conference. NAECON 1995","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124243388","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}

{"title":"Using the nominal operating point as a design variable for gain scheduled controllers","authors":"R. C. Martin, S. Kramer","doi":"10.1109/NAECON.1995.521983","DOIUrl":"https://doi.org/10.1109/NAECON.1995.521983","url":null,"abstract":"One approach to designing gain scheduled controllers is to decompose them into an inner loop scheduled so that the closed inner loop response is as close as possible to some nominal plant response and an unscheduled outer loop designed using the nominal plant. The choice of nominal plant/operating point is traditionally based on engineering judgment and experience. Rather than the usual approach of designing controllers for several operating points and interpolating between them, the authors have proposed a different procedure in which the parametric form of the controller is specified and parameter values are directly computed to minimize deviation from nominal over the entire operating range. This work presents an extension in which the nominal operating point is allowed to vary as an additional design variable in the optimization. This approach is applied to design of the F-18 longitudinal controller inner equalization loop. The resulting controller has significantly better consistency as compared to an existing design created using the old approach.","PeriodicalId":171918,"journal":{"name":"Proceedings of the IEEE 1995 National Aerospace and Electronics Conference. NAECON 1995","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124433154","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}

{"title":"Embedded training for the joint surveillance and target attack radar system ground station module","authors":"K. Mutch, V.T. Fox","doi":"10.1109/NAECON.1995.522015","DOIUrl":"https://doi.org/10.1109/NAECON.1995.522015","url":null,"abstract":"Embedded training is a capability within an actual operational system, which provides sustainment training for system operators. It is invoked and used by the operator without instructor supervision. This paper describes Motorola's prototype embedded training system for the Army's Joint Surveillance and Target Attack Radar System (Joint STARS) groundstation. The embedded training capability is implemented entirely within the operational system software. It contains features of a full embedded training system, including scenario and stimuli presentation, adaptation to student weaknesses, checking input, context-sensitive help, and presentation and storage of student performance results.","PeriodicalId":171918,"journal":{"name":"Proceedings of the IEEE 1995 National Aerospace and Electronics Conference. NAECON 1995","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123616119","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}

{"title":"Reliability evaluation of survivable fiber optic networks [aircraft LANs]","authors":"Y. Su, Z. Li, Ming Li","doi":"10.1109/NAECON.1995.522041","DOIUrl":"https://doi.org/10.1109/NAECON.1995.522041","url":null,"abstract":"Five kinds of fiber optic network architectures are studied from viewpoint of reliability and survivability (connectivity) under normal and abnormal situations. In normal situation we derive formulas for calculating average number of terminals which can communicate when one component fails. And in abnormal situation we calculate NCF and FCF which reflect network connectivity. On the basis of the analysis, some criterion are presented for designing survivable fiber optic networks.","PeriodicalId":171918,"journal":{"name":"Proceedings of the IEEE 1995 National Aerospace and Electronics Conference. NAECON 1995","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123633419","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}

{"title":"Analytical solution for a steady-state Kalman filter tracker with random power spectral density process noise","authors":"J. J. Sudano","doi":"10.1109/NAECON.1995.522020","DOIUrl":"https://doi.org/10.1109/NAECON.1995.522020","url":null,"abstract":"An analytical solution is obtained for a steady-state Kalman filter tracker with a random power spectral density as process noise. Great insight is obtained from these analytic solutions of trackers. Optimal relationships are obtained between the gain variables. A unitless tracking index is defined as the only variable driving the steady-state Kalman filter tracker. This unitless tracking index value is defined as: /spl Lambda/=/spl radic/(psd8(/spl Delta/T)/sup 3///spl sigma//sub m//sup 2/). Optimal gains and minimum covariance are analytically calculated given the tracking index /spl Lambda/A.","PeriodicalId":171918,"journal":{"name":"Proceedings of the IEEE 1995 National Aerospace and Electronics Conference. NAECON 1995","volume":"199 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121074647","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}

{"title":"Real time aircraft simulation using J-MASS","authors":"R. Stevenson, T. Emrich, J. Jones","doi":"10.1109/NAECON.1995.522023","DOIUrl":"https://doi.org/10.1109/NAECON.1995.522023","url":null,"abstract":"McDonnell Douglas Aerospace (MDA) has developed a six degree-of-freedom (DOF) aircraft model that is suitable for use at various levels of simulation, from manned to interactive to all digital. The model is based on the performance of the aircraft being simulated and is used for development of flying qualities criteria or for existing simulations where high angle of attack, take-off's and landings are not required. The model is ideal for use in air combat studies where the exact performance of the model is known and real time operation is required (20 Hertz update rate). The original aircraft model was written in FORTRAN and is still in use. When a manned simulation is not needed, digital pilot logic provides stick and throttle inputs to the model. Available maneuvers include lever flight, sustained turns, waypoint following and others. This model has been rewritten in Ada and re-engineered to add additional capabilities. The model has become more object oriented, and still updates in real-time. In addition, an Ada interface has been added to the model so it is compliant with the Joint Modeling and Simulation System (J-MASS).","PeriodicalId":171918,"journal":{"name":"Proceedings of the IEEE 1995 National Aerospace and Electronics Conference. NAECON 1995","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128653139","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}

{"title":"Doppler Compensation of Range Profiles And Moving Target Discrimination In FMCW Radar","authors":"He Songhua, Zhang Liang, Zhang Wenfeng","doi":"10.1109/NAECON.1995.521910","DOIUrl":"https://doi.org/10.1109/NAECON.1995.521910","url":null,"abstract":"In our work summarized in this paper, the response equation of moving target stimulated by a high-frequency wide-band LFMCW is firstly established. Then the method of estimating the radial velocities of both clutter center and moving target is studied. Moving target can be discriminated by the time-integrated Doppler spectrum obtained from sampled data of multiple frequency sweep periods. Finally the approaches of Doppler compensation of range profile are studied. It is shown that Doppler compensation is essential for time integrating in each range resolution cell to enhance target. The compensated range profiles are more applicable for both detection and identification -3 of radar target INTRODUCTlON For ground target identification, wide-band wave form technology is used in missile-borne or airborne radar to reach high range resolmon(HRR). Under HRR circumstance, stationary or slow-moving target can be discriminated and identified by using geometrical shape and structure features of range profile.ln missile-bome or airbome application, the position and density of each scatter in target range profile are rapidly glinting due to high speed of the platform, which leads to insbbilty for both stationary and moving target Considering Doppler movement, the obtained range profiles for target identification and discrimination are not easily to be integrated for enhancement of detection performance and not adaptive to be rule-based model for target classification. In order to detect, discriminate and identify moving target in a strong moving clutter background, the processing of Doppler compensation and integration wrth range profiles is to be done. DOPPLER EFFECTS OF RANGE PROFILE Provided that the incident wave is a linear frequency modulated continuous wave(LFMCW), the parameterr of which is shown in Fig. 1, where t = nT, itn (0 5 t , 5 I\",) (1 1 Let Y, denote the radial velocity of the m-th (m c [ l , M ] ) scattering center, then its time delay can be given by The demodulated signal after removing the phase item that can be neglected is M","PeriodicalId":171918,"journal":{"name":"Proceedings of the IEEE 1995 National Aerospace and Electronics Conference. NAECON 1995","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124615006","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}