What is the reason for sending two transmissions in the same band?(a) Redundancy(b) Ionosphere refraction corrections(c) Multiplexing(d) Reducing trafficI had been asked this question during an online interview.I'd like to ask this question from NAVSTAR GPS in section Satellite Radio Navigation& Inertial Navigation of Avionics

What is the reason for sending two transmissions in the same band?(a)

1.	What is the reason for sending two transmissions in the same band?(a) Redundancy(b) Ionosphere refraction corrections(c) Multiplexing(d) Reducing trafficI had been asked this question during an online interview.I'd like to ask this question from NAVSTAR GPS in section Satellite Radio Navigation& Inertial Navigation of Avionics
Answer» Correct option is (b) IONOSPHERE refraction CORRECTIONS The explanation: Each GPS SATELLITE transmits signals at TWO frequencies in the L-band to permit IONOSPHERIC refraction corrections by properly equipped users. These signals are in sync with the pseudorandom noise that is unique to each satellite to provide instant ranging capabilities.

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