Sun Sensor dan Magnetometer Sebagai Sensor Penentu Sikap Satelit Inklinasi Rendah LAPAN-A2
DOI:
https://doi.org/10.30536/j.jtd.2018.v0.a2950Keywords:
LAPAN-A2, penentuan sikap, sun sensor, magnetometerAbstract
LAPAN-A2 merupakan satelit low earth orbit (LEO), inklinasi rendah yang salah satu misinya adalah pengamatan citra bumi. Dalam melaksanakan misi pengambilan citra ataupun penurunan data, sikap satelit perlu diketahui operator di ruas bumi. Sebagai sensor utama untuk mengetahui sikap satelit digunakan star sensor. Namun ketika berada di wilayah terang, star sensor dapat dengan mudah terganggu oleh cahaya matahari atau bumi. Tulisan ini memperkenalkan penentuan sikap alternatif menggunakan sun sensor dan magnetometer. Idenya, sun sensor dan magnetometer mengukur vektor matahari dan vektor medan magnet pada sumbu satelit. Lalu, dengan menggunakan model posisi matahari dan propagator orbit SGP4, vektor matahari dan vektor medan magnet pada sumbu inersial bumi dapat dihitung. Dari dua vektor pada dua tata acuan yang berbeda, matriks rotasi yang merupakan representasi sikap satelit terhadap bumi dapat dihitung. Dari pengujian, metode ini berhasil menghitung sikap satelit dengan akurasi 3o.
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