Introduction to Satellite Tracking GPS Technology

GPS basic components
Into the commercial phase of the global satellite positioning system, must include air satellite ground control system, the user receiver is in three parts. Has now launched 24 satellites to provide two

L-Band Carrier: L1 (1575.42MHz) and L2 (1227.60MHz) modulated PRN code. Responsible for transmitting navigation signals L1, L2 frequency is responsible for the accuracy of the delay in signal transmission, supply PPS receivers use.
Carrier signal using three types of code modulation, namely, crude extract modulation code navigation signal (Coarse Acquisition Code), responsible for obtaining the positioning signal and the definition of basic information for each satellite, and the load times a layer of the navigation message coding system to the receiver is more precise positioning signals; the second and third respectively for P code modulation code and Y code modulated L1 and L2 frequencies, respectively, for the military PPS receivers locking signal. Not easily disturbed P code (Precise Code; 10.23MHz) for military use; and civil use, compared with C / A code (Coarse / Acquisition Code, 1.023MHZ).
Ground control system consists of monitoring stations (Monitor Station), the main controller (Master Monitor Station), ground antennas (Ground Antenna) composed the main control station in Colorado, USA Springfield (Colorado Spring). Ground control station is responsible for collecting the information returned by the satellite and the satellite ephemeris calculation, the relative far away, atmospheric correction data. Followed by the user receiver, the two existing single-frequency and dual-band, but because of price factors, the multi-user purchased a single-frequency receiver.

SPS and PPS GPS
GPS provides the general use of SPS (Standard Positioning System) and precision positioning system PPS (Precision Positioning System) are two positioning systems. SPS is the most common