Ranging Signals Definition
Ranging signals are a set of signals transmitted by GPS satellites that enable the receiver of an aircraft to determine the distance from every satellite to the aircraft. These signals essentially provide range measurements, which are crucial in determining a precise position of the aircraft.
To obtain these range measurements, the aircraft’s GPS receiver calculates the time it takes for the ranging signals to travel from each satellite to its receiver, also known as time of arrival (TOA). The times of arrival are then used to compute the distance between the aircraft and each satellite.
The ranging signals are critical to GPS navigation as they provide not only range measurements but also position accuracy, speed, and time information. They are transmitted at a frequency of 1.023 MHz and use a code division multiple access (CDMA) technique to differentiate the signals from various GPS satellites.
In conclusion, ranging signals are crucial in modern navigation systems, making them a vital component of aircraft GPS receivers. These signals provide accurate range measurements, position, speed, and time information, which are necessary to ensure safe and efficient air travel.
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