GPS signal is briefly introduced

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????GPS satellite transmits carrier signals with two frequencies, namely L1 carrier with a frequency of 1575.42MHz and L2 carrier with a frequency of 1227.60Mhz. Their frequencies are 154 times and 120 times of the basic frequency of 10.23MHz, and their wavelengths are 19.03cm and 24.42cm, respectively. A variety of signals are modulated on L1 and L2 respectively. These signals mainly include:

????C/A code

????C/A code is also known as coarse capture code, which is modulated on L1 carrier and is a 1MHz pseudo-random noise code (PRN code) with a code length of 1023 bits (period of 1ms). Since each satellite has A different C/A code, we often use their PRN number to distinguish them. C/A code is one of the main signals used by ordinary users to determine the distance between the station and the satellite.

????P code

????P code is also known as fine code, it is modulated on L1 and L2 carrier, is 10MHz pseudo-random noise code, its period is seven days. In the implementation of AS, P code and W code are added mode-two to generate a secret Y code. At this time, ordinary users cannot use P code for navigation and positioning.

????Y code

????See P code.

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