Emergency Locator Transmitter (ELT) signal models for SARSAT

Carter, C. R.; Casas, E.; Chung, T.

doi:10.1109/ceej.1986.6593743

Cited by 7 publications

(7 citation statements)

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“…Beberapa penelitian yang membahas ELT receiver dengan desain yang komplek dan menggunakan divais yang mahal, antara lain: enhanced emergency locator transmitter (E2LT) untuk general aviation craft yang dilengkapi dengan crash sensor dan global positioning system [6], ELT dan enhanced ground proximity warning system (EGPWS) receiver dengan VLSI design [7], studi kelayakan emergency locator signal detection dan geolocation small satellite constellation [8], proposal tiga model yang berbeda untuk ELT signal [9], dan desain web based module untuk SAR pada ELT receiver dengan sistem CORPAS-SARSAT [10].…”

Section: Pendahuluanunclassified

“…Dibandingkan penelitian lain tentang ELT yang menggunakan divais dan metode yang rumit, serta masih berupa konsep pengembangan, yaitu: sistem receiver [6], desain receiver [7], studi kelayakan emergency locator signal detection [8], proposal model untuk ELT signals [9], dan desain web based module untuk SAR pada receiver ELT [10], penelitian ini telah berhasil merealisasikan pembangkit sinyal ELT pada frekuensi 121,5 MHz sesuai spesifikasi penerbangan sipil, dengan metode yang sederhana dan divais elektronik yang tersedia di pasar dalam negeri.…”

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Pembangkit Sinyal ELT pada Frekuensi 121,5 MHz

Rustamaji¹,

Sawitri

Sitepu

2019

Jurnal Teknik Elektro

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An ELT is a beacon indicating the location of distress or crash of aircraft on land or sea. The ELT is placed in an airplane, which is a transmitter with low transmit power and an antenna. The ELT transmitter has been widely used for flights at the frequency of 121.5 MHz (civilian) and 243 MHz (military). The purpose of this study is to produce ELT signal generators at the 121.5 MHz frequency, with low-cost devices that meet specifications for civil aviation. In this research has been produced a design of an ELT signal generator at the frequency of 121.5 MHz, consist of a crystal oscillator, a sawtooth generator, a VCO, and an amplitude modulator. Based on the measurement and test results, the sawtooth generator generated a sawtooth signal at the frequency of 1.8 to 3.6 Hz, the VCO generated a sinusoidal signal at the frequencyof 316 to 366 Hz, the RF generator generated a sinusoidal at the frequency of 121.505 MHz. The ELT signal generator was able to generate AM signals at the minimum amplitude deviation of 100 mVpp to maximum one of 156 mVpp, the modulation index (m) of 21.875%, and the frequency of 121.505 MHz. The results of this study are ELT signal generators at the frequencies of 121.5 MHz that are in accordance with specifications for civil aviation. Abstrak-ELT adalah perangkat suar atau beacon pemberi tanda lokasi terjadinya distress atau crash pesawat terbang di daratan atau lautan. ELT ditempatkan di pesawat terbang, berupa transmitter dengan daya pancar rendah dan dilengkapi sebuah antena. Pemancar ELT telah digunakan secara luas untuk penerbangan pada frekuensi 121,5 MHz (sipil) dan 243 MHz (militer). Tujuan dari penelitian ini untuk menghasilkan pembangkit sinyal ELT pada frekuensi 121,5 MHz, dengan divais berbiaya murah yang sesuai spesifikasi untuk penerbangan sipil. Pada penelitian ini telah dihasilkan desain pembangkit sinyal ELT pada frekuensi 121,5 MHz, terdiri dari osilator kristal, sawtooth generator, VCO, dan amplitude modulator. Berdasarkan hasil pengukuran dan pengujian yang telah dilakukan, rangkaian sawtooth generator menghasilkan sinyal sawtooth pada frekuensi 1,8 s.d 3,6 Hz, VCO menghasilkan sinyal sinusoida pada frekuensi 316 s.d 366 Hz, RF generator menghasilkan sinyal sinusoida pada frekuensi 121,505 MHz. Pembangkit sinyal ELT mampu bekerja menghasilkan sinyal AM pada simpangan amplitudo minimum 100 mVpp s.d maksimum 156 mVpp, indeks modulasi (m) 21,875%, dan frekuensi 121,505 MHz. Hasil penelitian ini adalah pembangkit sinyal ELT pada frekuensi 121,5 MHz yang sesuai spesifikasi untuk penerbangan sipil. Kata kunci-sawtooth generator, VCO, osilator kristal, amplitude modulator, ELT

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Section: Pendahuluanunclassified

unclassified

Pembangkit Sinyal ELT pada Frekuensi 121,5 MHz

Rustamaji¹,

Sawitri

Sitepu

2019

Jurnal Teknik Elektro

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“…The mathematical representation of an amplitude modulated signal can be described as the follo %sling : X(2) -AJ/+na(l)/Sin(217fJ+ 8 ) (4 where ~1 is the modulation factor which can be varied from 85 % to 100 % and cp i (t) is given by .…”

Section: L T Signalmentioning

confidence: 99%

“…The instantaneous frequency, &(t) is approximated in the least square sense by a hear fbnction and also by a quadratic knction [4,5]. The linear fit offin(t) is given by :…”

Section: L T Signalmentioning

confidence: 99%

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Processing of SARSAT signals using modified digital Lerner filter

Dessouky

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)

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Search arid Rescue Satellite Aided 'Tracking ( S A R S K T ) is a method of employing satellites in low polar orbits to relay the emergency signals from distressed platforms to an earth station where signal processing techniques are used to measure the Doppler frequency shiR . This paper deals with transmitting an Eniaigency Locator Transmitter (ELT) signal through a second order bandgass Lerner filter and then estimating the power spedral density of the output signal using the periodogram and averaged periodogram techniques. Lerner filter possesses a flat responses across the passband and a steep skirt response at band edges ,which improve the detection ofthe carrier component peak at the ELT signal.

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406 MHz ELT signal spectra for SARSAT

Vrckovnik¹,

Carter

1991

IEEE Trans. Aerosp. Electron. Syst.

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Emergency Locator Transmitter (ELT) signal models for SARSAT

Cited by 7 publications

References 0 publications

Pembangkit Sinyal ELT pada Frekuensi 121,5 MHz

Pembangkit Sinyal ELT pada Frekuensi 121,5 MHz

Processing of SARSAT signals using modified digital Lerner filter

406 MHz ELT signal spectra for SARSAT

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