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              Minimum Received     Power Emitted Toward +Z #    IGS Model
GPS Block         RF Power *         subtotals      totals        Values %
---------   --------------------   -------------------------   ------------
IIA         L1 P(Y) = -161.5 dBW      10.89 W   ]
            L1 C/A  = -158.5 dBW      21.73 W   ]  35.93 W         76  W
            L2 P(Y) = -164.5 dBW       3.31 W   ]

IIR         L1 P(Y) = -161.5 dBW      12.27 W   ]
            L1 C/A  = -158.5 dBW      24.49 W   ]  40.49 W         85  W
            L2 P(Y) = -164.5 dBW       3.73 W   ]

IIR-M       L1 P(Y) = -161.5 dBW      10.16 W   ]   no M:         no M:
            L1 C/A  = -158.5 dBW      20.28 W   ]  45.32 W        108  W
            L1 M    = -158.0 dBW      23.   W + ]   
            L2 P(Y) = -161.5 dBW       6.17 W   ]   w/ M:         w/ M:
            L2 C    = -160.0 dBW       8.71 W   ]  82.   W +      198  W
            L2 M    = -158.0 dBW      14.   W + ]

IIF         L1 P(Y) = -161.5 dBW      10.76 W   ]   no M:         no M:
            L1 C/A  = -158.5 dBW      21.48 W   ]  68.04 W        154  W
            L1 M    = -158.0 dBW      24.   W + ]   
            L2 P(Y) = -161.5 dBW       6.53 W   ]   w/ M:         w/ M:
            L2 C    = -160.0 dBW       9.23 W   ] 107.   W +      249  W
            L2 M    = -158.0 dBW      15.   W + ]
            L5 I    = -157.9 dBW   ]  20.04 W   ]
            L5 Q    = -157.9 dBW   ]            ]

IIIA        L1 P(Y) = -161.5 dBW       ???? W   ]
            L1 C/A  = -158.5 dBW       ???? W   ]
            L1 C    = -157.0 dBW       ???? W   ]
            L1 M    = -158.0 dBW @     ???? W   ]
            L2 P(Y) = -161.5 dBW       ???? W   ]
            L2 C    = -158.5 dBW       ???? W   ]
            L2 M    = -158.0 dBW @     ???? W   ]
            L5 I    = -157.0 dBW       ???? W   ]
            L5 Q    = -157.0 dBW       ???? W   ]

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Notes:

* Minimum received power as measured at the output of a 3 dBi linearly 
polarized receiving antenna located near the Earth's surface when the
SV is at >5 deg elevation over 20.46 MHz bandwidth (Table 3-Va & 3-Vb
in IS-GPS-200E, 8 June 2010; Table 3.2-1 in IS-GPS-800A, 8 June 2010;
Table 3-III in IS-GPS-705A, 8 June 2010). Any L3 tnsmissions are
ignored here, but those are intermittent.

Note that the IS minimum received RF specs use the relation
  antenna gain = 4 * pi * Area / lambda^2
for the wavelengths
  L1:  wavelength = 19.03 cm  frequency = 1575.42 MHz
  L2:  wavelength = 24.42 cm  frequency = 1227.60 MHz
  L5:  wavelength = 25.48 cm  frequency = 1176.45 MHz

# Transmit antenna power estimates taken from a NASA presentation by
Rodney Spence (2010) that inferred values based on IS minimum received
power levels using realistic antenna gain curves and propagation losses;
actual transmit levels could be higher.

+ Inferred value for M-code power based on analogy with other tabulated
values and assuming similar antenna gain curves.  Note that the M-code
signal is nominally turned on for all Block IIR-M and later SVs, but the
signal on SVN62/PRN25 was turned off on 05Apr2011 (NANU 2011026) for
testing and no notice has been given that the signal has resumed.

% IGS model values are derived from the transmit antenna power estimates
but scaled up +3 dB and +5 dB at L1 and L2, respectively, to account for
the higher power levels observed from actual GPS SVs in Blocks II, IIA,
and IIR (see "Current constellation GPS satellite ground received signal
power measurements" by C. Edgar, D.B. Goldstein, P. Bentley, ION National
Technical Meeting proceedings 2002, pp. 948-954); lacking measured values
for L5, a scaling of +3 dB was applied.

@ Under flex power operating modes M-code levels can increase to -153.0
dBW but by lowering power on P-code signals.
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