Explanation: The determination of data by GPS involves two procedures almanac and ephemeris. Almanac contains information about the status of the satellites and the approximate orbital information.

Explanation: Trilateration is the basic principle involved in the GPS surveying. This was originally used in case of basic surveying, where the calculation involves a couple of mathematical operations.

Explanation: GPS can generate PRN codes that indicate Pseudo Random Noise. It is transmitted along with the signal. While travelling along with the signal, it is capable of determining the travel time of the signal which is correlated with the reference PRN codes for processing.

Explanation: Pseudo ranging is the measure of distance between satellite and the receiver antenna. It can refer the time of emission and reception of codes by which the satellite and user range can be detected and further used in many cases.

Explanation: Clock offset must be placed in the satellite containing GPS so that it can be able to compute the relative time of transmission and reception of radio signal. By knowing this, the satellite to user range can be defined.

Explanation: The Global Positioning System can also be determined as NavStar. The main functioning of GPS is to track the location of the specified place or object using the satellites and the receiver.

Distance = 54 * 109 m.

Explanation: For the determination of the satellite to user range, the time difference between the signal sent and the signal received is compulsory. This can be recorded only if there is a signal. So, for determining range a precise signal is necessary.

Explanation: There are certain factors which can affect the accuracy of the position obtained by GPS. Those include the position of satellite, atmospheric conditions, satellite clock errors and ephemeris errors.

Explanation: The error in the accuracy of GPS can also be caused due to the increase in altitude of the satellite. The error caused due to the horizontal increase in distance is less when compared to altitude error.