In light of this reason, the different values of the drag coefficient are selected to see the how the drag coefficient affects the reentry point
and the probabilistic ellipsoid of debris dispersion caused by the breakup event in this study.
The website gave the approxiate reentry point
on the map, which shows its hypothetical location.
Return trajectory, as an important part of satellite recovery mission, is flight trajectory of spacecraft from its working orbit to required reentry point. The purpose of return trajectory optimization is to obtain control variables of spacecraft that null the endpoint errors between the spacecraft final state vector and the target state vector while minimizing the total fuel mass consumption.
Spacecraft begins to decelerate under the backward thrust of engine and flies to the reference reentry point accurately under the control of attack angle and slide angle.
The optimal return trajectory can be described as follows: at the beginning of the second phase, the attack angle is almost 180[degrees], which means that the thrust has been turned to the same direction as that of the velocity; then the engine works to decline the velocity of spacecraft until the end of second phase; in the third phase, the spacecraft flies without power in a transition track; the attack angle and slide angle are adjusted to optimal values; and, in fourth phase, the engine works to accelerate reaching the reentry point.
(3) The state errors between terminal state of optimal trajectory and reference reentry point state are listed in Table 3, which satisfy required precision.
Despite the Greek debacle, I doubt Goldman Sachs will fall below 180, an ideal reentry point
for those UAE investors who missed the bank's 30 per cent bull run since mid 2014.
October is historically a bad month for stocks but is usually seen as a good reentry point
for investors looking to accumulate at cheaper levels.
The schematic diagram of the downrange is presented in Figure 5, where [r.sub.0] and [v.sub.0] are the position vector and velocity vector, respectively, of the reentry point
. [O.sub.E] is the center of the Earth, and [r.sub.f] is the position vector of the reentry terminal point.
All reentry points
have been sealed by erecting barbed wire and placing containers.