کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10680894 | 1013450 | 2005 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Preliminary design of a space system operating a ground-penetrating radar
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موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی هوافضا
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چکیده انگلیسی
Ground-penetrating radars (GPR) are currently used only in ground campaigns or in few airborne installations. A feasibility analysis of a space mission operating a GPR for archaeological applications is presented in this work with emphasis on spacecraft critical aspects: antenna dimension and power required for achieving adequate depth and accuracy. Sensor parametric design is performed considering two operating altitudes (250 and 500Â km) and user requirements, such as minimum skin depth, vertical and horizontal resolution. A 500-km altitude, 6Â a.m.-6Â p.m. sun-synchronous orbit is an adequate compromise between atmospheric drag and payload transmitted average power (12Â kW) to achieve a 3-m penetration depth. The satellite bus preliminary design is then performed, with focus on critical subsystems and technologies. The payload average power requirement can be kept within feasible limits (1Â kW) by using NiH2 batteries to supply the radar transmitter, and with a strong reduction of the mission duty cycle (40kmÃ1100km are observed per orbit). As for the electric power subsystem, a dual-voltage strategy is adopted, with the battery charge regulator supplied at 126Â V and the bus loads at 50Â V. The overall average power (1.9Â kW), accounting for both payload and bus needs, can be supplied by a 20m2 GaAs solar panel for a three-year lifetime. Finally, the satellite mass is kept within reasonable limits (1.6 tons) using inflatable-rigidisable structure for both the payload antenna and the solar panels.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Astronautica - Volume 57, Issue 11, December 2005, Pages 851-863
Journal: Acta Astronautica - Volume 57, Issue 11, December 2005, Pages 851-863
نویسندگان
Marco D'Errico, Salvatore Ponte, Michele Grassi, Antonio Moccia,