tokens: ['RTK', 'FKP', 'Gradients', 'provides', 'the', 'GNSS', 'receiver', 'with', 'horizontal', 'gradients', 'for', 'the', 'geometric', 'troposphere', 'and', 'satellite', 'orbits', 'and', 'ionospheric', 'signal', 'components', 'in', 'the', 'observation', 'space', 'According', 'to', '', 'RTK', 'FKP', 'gradient', 'information', 'should', 'be', 'typically', 'transmitted', 'every', '', 'seconds']