GPS Satellite Signal Characteristics - Understanding GPS: Principles and Applications - page 150

The M code signal will be broadcast through the Earth-coverage L-band
antenna on the Block IIR-M and later GPS satellites. The minimum anticipated
Earth-coverage M code power level is 158 dBW on L1 [19]. For Block III and later

GPS satellites, a higher power M code signal is also planned to be broadcast in lim-
ited geographic regions. The minimum received power for this higher powered sig-
nal, referred to as spot beam M code, is anticipated to be

−

− 138 dBW [19].

4.5.4 L1 Civil Signal
The United States is planning to add a modernized civil signal upon the L1 frequency
within the Block III time frame [20]. The design of this new signal, referred to as
L1C, was still underway at the time of this writing. The modulation will likely be
BOC s (1,1), based upon the recommendations from [20].

4.6 Summary

This chapter has described the current and planned GPS signals. A summary of key
characteristics of each of the signals is presented in Table 4.10.

References

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