Become a Patron and get help from Pros
The precise code of the GPS signal, used by military receivers.

Related Terms

L-2 SIGNAL

The second L-band signal of the GPS satellite, transmitted at 1227.60 MHz, modulated with the P-code and navigation message.

L-1 SIGNAL

The primary L-band signal transmitted by each GPS satellite at 1572.42 MHz. It is modulate

ANCHOR WATCH

The crewmen assigned to take care of the ship while anchored or moored, charged with such duties as making sure that the anchor is holding and the vessel is not drifting. Most marine GPS units have an Anchor Watch alarm capability.

GPS

Global Positioning System (see GNSS)

GPS

Global (satellite) positioning system

PSEUDO-RANGE

Measure of distance from GPS satellite to receiver, uncorrected for synchronization errors between satellite and receiver clocks.

PSEUDO-RANDOM NOISE

An apparently random but reproducible sequence of binary code used in the GPS signal.

SELECTIVE AVAILABILITY

A Department of Defense program which degrades the accuracy of the pseudorange measurement of the GPS signal by dithering the clock time and ephemerides data, providing a less accurate fix for civilian users. It can be turned on or off at will by DoD.

C/A

Coarse Acquisition - the radio signal on the L band frequency of 1575.42 MHz that civilian GPS receivers use. As opposed to the P code used by the US military.

DOP

Dilution of precision an indication of the quality of the signal being received from the satellite. Dilution of precision can be horizontal, vertical, position and time. These are then combined and given as a GDOP (Geometric Dilution Of Precision). The smaller the number the better. The GPS selects satellites based on GDOP.

Related questions

MarineProHelp 2018 - 2021