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بهبود نقشه‌های جهانی مدل تجربی IRI2016 با تلفیق مشاهدات GPS و Swarm
صدیقه کریمی، محمدعلی شریفی*، سعید فرزانه
دانشگاه تهران
چکیده:   (564 مشاهده)
این مقاله مدلی برای بهبود نقشه‌های محتوای  الکترون کلی قائم (VTEC) مدل مرجع بین‌المللی یونوسفر 2016 (IRI) با استفاده از تلفیق مشاهدات Swarm با مشاهدات سیستم تعیین موقعیت جهانی (GPS) ارائه می‌دهد. مدل ارائه شده از دو بخش مدل زمینه و تصحیحات تشکیل شده است. در این مقاله مدل IRI2016 به عنوان مدل زمینه انتخاب گردید و بخش تصحیحات با استفاده از توابع بسط هارمونیک‌های کروی تا درجه و مرتبه 15 در سیستم مختصات خورشید-ثابت (Sun-fixed) مدل‌سازی شده است. در ترکیب مشاهدات VTEC به دست آمده از Swarm و GPS، بایاس‌های سیستماتیک ماهواره‌های Swarm به عنوان ترم‌های ثابت مجهول در هر اپک زمانی  در نظر گرفته شده‌اند. علاوه بر این، برای در نظر گرفتن سطوح مختلف دقت گروه‌های مشاهداتی، از روش برآورد مولفه واریانس هلمرت استفاده شده است. جهت ارزیابی مدل پیشنهادی، نقشه‌های جهانی یونوسفری (GIM) ترکیبی دو بعدی در 28 سپتامبر 2017 و 3 ژانویه 2018 به ترتیب با ضرایب Kp (شاخص فعالیت خورشیدی) 7 و 1 ساخته شده‌اند. مقایسه نقشه‌های GIM ترکیبی به دست آمده با نقشه‌های GIM حاصل از خدمات بین‌المللی سیستم‌های ماهواره‌ای ناوبری جهانی (IGS)، نشان می‌دهد که مدل ترکیبی سازگاری بیشتری با نقشه‌های IGS دارد و افزودن مشاهدات Swarm و GPS به مدل زمینه IRI2016، می‌تواند تا حد زیادی مدل IRI2016 را به ویژه در مناطق اقیانوسی بهبود بخشد. نتایج نشان می‌دهد نقشه‌های جذر میانگین مربعات (RMS) و خطای جذر میانگین مربعات (RMSE) به ترتیب، حدود 19 الی 45 درصد و 43 الی 67 درصد برای روز با ضریب Kp بالا و حدود 13 الی 40 درصد و 15 الی 43 درصد برای روز با ضریب Kp پایین کاهش یافته‌اند.
واژه‌های کلیدی: محتوای کل الکترون، Swarm، GPS، مدل IRI-2016، برآورد مولفه واریانس
متن کامل [PDF 2248 kb]   (124 دریافت)    
نوع مطالعه: پژوهشي | موضوع مقاله: ژئودزی (عمومی)
دریافت: 1400/8/28 | پذیرش: 1400/12/4 | انتشار الکترونیک پیش از انتشار نهایی: 1400/12/4 | انتشار: 1400/12/16
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Karimi S, Sharifi M A, Farzaneh S. The Improvement of IRI2016 global maps by the integration of Swarm and GPS observations. jgit. 2022; 9 (4) :87-107
URL: http://jgit.kntu.ac.ir/article-1-863-fa.html

کریمی صدیقه، شریفی محمدعلی، فرزانه سعید. بهبود نقشه‌های جهانی مدل تجربی IRI2016 با تلفیق مشاهدات GPS و Swarm. مهندسی فناوری اطلاعات مکانی. 1400; 9 (4) :107-87

URL: http://jgit.kntu.ac.ir/article-1-863-fa.html



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