Yup, GLONASS = GLObal NAvigational Satellite System.
Although one should note that name is the intention; it has not always had global coverage (it does now), and may not always have global coverage in the future (say, if they decide to increase the precision in a strategic area at the cost of loss of coverage in others).
Navstar (owned by USDoD, what is commonly called "GPS"), GLONASS and soon Galileo all have global coverage.