27 November 2015
The three satellites launched this year for China's indigenous satellite navigation system are sending twice as many signals as their predecessors, said the system's designer, after completing tests on the new units.
The 18th and 19th satellites for the Beidou Navigation Satellite System (BDS), which is being developed as an alternative to U.S.-operated GPS, were sent into space on 26 July and the 20th on 30 September.
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