GPS IIR-M L1 Transmit Power Redistribution: Analysis of GNSS Receiver and High-Gain Antenna Data

摘要

All seven operational GPS Block IIR-M satellites experienced short maintenance periods in February 2017. It was later identified that the satellites' transmit power of different L1 signal components had been changed during this maintenance. The total radiated power of the satellites remains constant, but the powers of the C/A-code and the P(Y)-code signals have increased while the powers of the M-code and the intermodulation product have reduced. Further examination reveals a more efficient use of the total available power on the spacecraft as more power is available for the three navigation signals on L1.