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The current lunar gravity field models are mostly concluded from lunar exploration programs either by observations of satellite orbit perturbations or by intersatellite ranging and ranging rate measurements between two low-orbiting spacecrafts.
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The study also found that as Boomers mature out of other age ranges, rates will go down.
The second step is to further eliminate the use of range rate measurement by using an estimated range rate, obtained via a sliding-mode estimator based on range measurement, to replace actual range rate measurement.
Fig. 2. (a) Interferograms with no GPS-correction using RARR (Range And Range Rate) orbit data.
An acceleration estimation algorithm based on the range rate measurement was developed in [5].
That convinced her that she could live with the car's 73-mile Environmental Protection Agency range rating.
Each receiver extracts the targets bistatic range and range-rate information, while estimating their azimuth angle.
The present-day accuracies in measuring the GRACE biased range and range-rate are σρ∼1−10μm,σρ∼1−10μmμms−1.
({dot gamma _{k}}) Sensor received bistatic range-rate measurement at time k.
The smaller contractors recorded rates ranging between 10 and 19percentt.
Monthly rates range from $11,850 to $14,800 and nightly rates from $695 to $895.
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