Pembangkit Sinyal Master Pada Sistem Navigasi LORAN-C menggunakan FPGA
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Abstract
Navigasi saat ini menjadi hal yang sangat penting untuk menunjang kehidupan manusia, bahkan dapat digunakan sebagai sistem pertahanan dan ketahanan negara. Saat ini, sistem navigasi di Indonesia masih tergantung dengan sistem navigasi negara lain, khususnya yang berbasis satelit. Oleh karena itu, Indonesia membutuhkan sebuah sistem navigasi yang mandiri. LORAN-C adalah sistem navigasi terestrial yang menggunakan frekuensi ground wave dengan metode triangulasi, sehingga mempunyai radius cakupan yang luas. Pada penelitian ini dibuat subsistem pemancar sinyal master pada sistem navigasi LORAN-C dengan menggunakan FPGA. Penggunaan FPGA dimaksudkan untuk pembangkitan sinyal LORAN-C analog melalui sintesa digital (direct digital synthesis) pada tingkat baseband agar diperoleh format sinyal presisi tinggi. Dari hasil penelitian diperoleh sembilan pulsa master dengan spesifikasi sesuai dengan ketentuan sistem navigasi LORAN-C, lebar pulsa 300 µs, delay pulsa 700 µs serta amplitudo maksimum pada t = 60 – 65 µs.
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