Table 2.1. GG error budget for a target of 1 part in 1017 in EP testing (SI units). Worst case assumptions: launch close to solar maximum; maximum drag value along the orbit assumed. Q as measured in the lab; Common Mode Rejection as tested (taken from the "GG Phase A Study Report"26, Ch. 2.2 Table 2.1)

Acceleration

(transverse plane)

DUE TO:

Formula

Frequency

(inertial frame)

(Hz)

Frequency

(detected by spinning sensors)

(Hz)

Phase

Differential acceleration

(m/sec2)

Differential displacement

(m)

EP SIGNAL

w.r.t. Earth

test body to center of Earth

h=520 Km

Image34.gif (1039 byte)

545 sec diff. period

Air Drag

~ along track

 Image38.gif (1433 byte)

Solar radiation pressure

test body to center of Earth component

same

Infrared radiation from Earth

test body to center of Earth

same

Earth coupling to test bodies quadrupole moments

 

Image51.gif (1543 byte)

test body to center of Earth

Mechanical thermal noise

Image56.gif (1264 byte)

random

Total Error Budget

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