Which among the following techniques were employed for the identification of pairs in LORAN stations?(a) Modulation technique(b) Encoding scheme(c) Phase comparison between signals(d) Pulse repetition frequencyThe question was posed to me during an online exam.Asked question is from Next Generation Wireless Network in chapter Next Generation Wireless Network of Cognitive Radio

Which among the following techniques were employed for the identificat

1.	Which among the following techniques were employed for the identification of pairs in LORAN stations?(a) Modulation technique(b) Encoding scheme(c) Phase comparison between signals(d) Pulse repetition frequencyThe question was posed to me during an online exam.Asked question is from Next Generation Wireless Network in chapter Next Generation Wireless Network of Cognitive Radio
Answer» RIGHT answer is (d) Pulse repetition frequency The explanation: LORAN stations are composed of a master station and two slave stations. Each pair typically broadcasted over the following frequencies of 1.75, 1.8, 1.85, or 1.9 MHz. However, the location of stations is such that it allowed a PARTICULAR station to pick up signals from at least three stations. THUS to detect to pairs of signals, pulse repetition frequency comparison is employed.

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