Abstract: Navigation signal augmentation from low earth orbit (LEO) can improve the slow convergence and weak signal problem of the high/medium earth orbit navigation satellites, so it plays an important role in next generation navigation technique. Luojia-1A scientific experimental satellite deve-loped by Wuhan University carried the navigation augmentation payload, and it is capable of automatically calculating its orbit and clock by it self, generating and transmitting dual-frequency ranging signals. Luojia-1A satellite successfully demonstrates the navigation signal augmentation from LEO platform. This paper assesses the quality of the navigation augmentation signals from Luojia-1A from C/N0, precision of pseudorange and carrier phase and timing precision from single satellite. The results indicates the precision of the pseudorange and carrier phase at high elevation angle is 1.5 m and 1.7 mm respectively, which can meet the requirement of the navigation signal augmentation. Single satellite based timing precision from Luojia-1A is approximately 10-30 ns, which proves the correctness and validity of the satellite-ground ranging signals.