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Which of the following methods breaks the signal into finite segments to find the ASF?

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Which of the following methods breaks the signal into finite segments to find the ASF?

(a) Millington’s method

(b) Bill’s method

(c) Differential method

(d) Table look up process

The question was asked in exam.

My question comes from Hyperbolic Radio Systems topic in chapter Terrestrial Radio Navigation System of Avionics

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Best answer
The correct choice is (a) Millington’s method

Best explanation: In Millington’s method, the signal between the transmitter and the receiver is broken down into finite segments of different conductivity levels, based on conductivity maps. The incremental phase delay is then computed as a function of range and conductivity for each path segment summed and averaged to provide an estimate of ASF.

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