A novel electronic scanning concept is presented for producing a dual-polarized, dual-beam reflector antenna. The two beams correspond to an on-axis, transmit-receive beam and an off-axis, time-sequenced, sequentially scanned beam which is used to produce azimuth and elevation error signals for autotracking. The ESCAN beamforming technique produces low sidelobes in each of the beams while maximizing the G/T in the unmodulated data channel. The sidelobe and autotracking requirements of the 8 m, transportable antenna system for NASA were met with the ESCAN processing antenna. The antenna avoids the expense of a three-channel monopulse system.<>
{"title":"An improved electronic scan tracking antenna for S-band telemetry and remote sensing applications","authors":"J. H. Cook, R. Muñoz","doi":"10.1109/NTC.1991.148033","DOIUrl":"https://doi.org/10.1109/NTC.1991.148033","url":null,"abstract":"A novel electronic scanning concept is presented for producing a dual-polarized, dual-beam reflector antenna. The two beams correspond to an on-axis, transmit-receive beam and an off-axis, time-sequenced, sequentially scanned beam which is used to produce azimuth and elevation error signals for autotracking. The ESCAN beamforming technique produces low sidelobes in each of the beams while maximizing the G/T in the unmodulated data channel. The sidelobe and autotracking requirements of the 8 m, transportable antenna system for NASA were met with the ESCAN processing antenna. The antenna avoids the expense of a three-channel monopulse system.<<ETX>>","PeriodicalId":320008,"journal":{"name":"NTC '91 - National Telesystems Conference Proceedings","volume":"166 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127565157","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}
The optimum control solution for the capture of an exoatmospheric interceptor's attitude and rate errors is derived. A practical application of the method is investigated by considering the timing constraints imposed by the pulsewidth modulation scheme, and, as a result, timing logic for the thruster firings is derived. The concept is verified by comparing a three-pulse capture with the optimum two-pulse capture and the two-pulse capture with wait time using a 6-DOF simulation of an exoatmospheric interceptor. This comparison demonstrates a considerable improvement in the response time of the control.<>
{"title":"Time-optimal control application for an exoatmospheric interceptor","authors":"S.D. Cragon","doi":"10.1109/NTC.1991.147983","DOIUrl":"https://doi.org/10.1109/NTC.1991.147983","url":null,"abstract":"The optimum control solution for the capture of an exoatmospheric interceptor's attitude and rate errors is derived. A practical application of the method is investigated by considering the timing constraints imposed by the pulsewidth modulation scheme, and, as a result, timing logic for the thruster firings is derived. The concept is verified by comparing a three-pulse capture with the optimum two-pulse capture and the two-pulse capture with wait time using a 6-DOF simulation of an exoatmospheric interceptor. This comparison demonstrates a considerable improvement in the response time of the control.<<ETX>>","PeriodicalId":320008,"journal":{"name":"NTC '91 - National Telesystems Conference Proceedings","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117001895","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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