The new GPS navigation and positioning technologies progress

GPS satellite navigation capability of the most significant improvement from 2003, Lockheed Martin launched the first Ⅱ R-M (modified Ⅱ R) Satellite started. Ⅱ R-M satellites will be launched enhanced L1 civil signal, while launching the new L2 civil signal and the military code (M code). Further improvements will launch a batch of Boeing Satellite Ⅱ F 2005, Ⅱ F batch addition to launching the enhanced satellite L1, L2 civil signal and M code, the increase in the 1176.45 MHz 3rd civil signal (L5). Before the launch Ⅱ F, M code from the developmental transition to the work type. Since the launch of navigation satellite constellations require a period of time, so the track will have access to full working capacity in 2007, launched 18 L2 civil signal and M code satellite, can be achieved. 18 satellites of the third civil signal (L5) of the constellation is expected to be launched by 2011 end.

Since then, the U.S. military has been enhanced anti-jamming capability will be a new signal - M code. It can transmit more power, and non-interference in civilian receivers. M code back to the military a new capability to jam enemy's use of the signal, but the details are confidential.

L2 civil signal that a second civil signal called L2C, so that civilian users can compensate for atmospheric transport uncertainty error, so that the accuracy of civilian navigation increased to 3 to 10 meters. The U.S. military and its allies will be able to receive due to start in the L1 and L2 P code, it has been with this capability.