L2C Tracking Control

GPS satellites transmit several different carrier frequencies and apply different modulation codes to those carriers. The NetRS is capable of tracking several kinds of codes. On the L1 frequency (~1575 MHz) the C/A-code is always tracked. On the L2 frequency (~1255MHz), multiple codes may be available. On older satellites, the encrypted Y-code is usually all that is available. This signal was designed for military users and cannot be tracked directly without using militarized equipment. The NetRS normally uses a Trimble-proprietary cross-correlation method to track these Y-code signals.

Newer GPS satellites may modulate the L2 frequency with a second code designed for civilian use. This is the L2 Civil Signal, often refered to as L2C. The NetRS is able to track L2C signals when they are available. This capability can be enabled or disabled via the L2C Tracking Control page.

Top