This short communication presents a generic mathematical programming formulation for Computer-Aided Molecular Design (CAMD). A given CAMD problem, based on target properties, is formulated as a Mixed Integer Linear/Non-Linear Program (MILP/MINLP). The mathematical programming model presented here, which is formulated as an MILP/MINLP problem, considers first-order and second-order molecular gro...

The ever improving capabilities of the direct geo-referencing technology is having a positive impact on the widespread adoption of LIDAR systems for the acquisition of dense and accurate surface models over extended areas. Unlike photogrammetric techniques, derived footprints from a LIDAR system are not based on redundant measurements, which are manipulated in an adjustment procedure. The accur...

This paper describes a robust localization method for an outdoor robot that gives tours of the Rice University campus. The robot fuses odometry and GPS data using extended Kalman filtering. We propose and experimentally test a technique for handling two types of non-stationarity in GPS data quality: abrupt changes in GPS position readings caused by sudden obstructions to line of sight access to...

Besides their intended use in radionavigation, global positioning system (GPS) satellite signals provide convenient radio beacons for ionospheric studies. Among other propagation phenomena, the ionosphere affects GPS signal propagation through amplitude scintillations that develop after radio waves propagate through ionospheric electron density irregularities. This paper outlines the design, te...

In early 2010, JHU/APL delivered four ultra-stable oscillators (USOs) to the Jet Propulsion Laboratory (JPL) for the Gravity Recovery and Interior Laboratory (GRAIL) mission. GRAIL is a NASA Discovery lunar mission with the goals of mapping the entire lunar gravity field and, through the geodesy determined from this result, attempt to define the most likely model for the moon’s deep interior. S...

This article provides an introduction to and review of the field of computer-aided molecular design (CAMD). It is intended to be approachable for the absolute beginner as well as useful to the seasoned CAMD practitioner. We begin by discussing various quantitative structure-property relationships (QSPRs) which have been demonstrated to work well with CAMD problems. The methods discussed in this...

One precondition for direct sensor orientation with GPS and IMU is the correct sensor calibration. The related parameters as well as the relation between the IMU and the aerial camera (boresight misalignment) have to be determined by conventional bundle block adjustment. During this process a camera self calibration (focal length, principal point, additional parameters etc.) may be performed un...

Continuous monitoring of the range stability is a pre-requisite for sea-level rise and other demanding applications in satellite altimetry. Range stability may be investigated by either absolute or relative calibration techniques. In this study relative calibration is undertaken through intercomparison against TOPEX/Poseidon and absolute calibration undertaken in the vicinity of 8 tide gauges a...

Our recently developed indoor RF Ranging technology allows new levels of accurate indoor localization based on carrier-phase measurements. Measuring the phase difference over multiple frequencies, and combining it with a novel multipath angle-of-arrival differentiation technique, we achieving accuracies of a few centimeters in direct line of sight, and a few tens of centimeters in non-direct li...

Location systems that are based on scanning for nearby radio sources can estimate the position of a mobile device with reasonable accuracy and high coverage. These systems require a calibration step in which a map is built from radio-readings taken on a location-aware device. War driving, for example, calibrates the positions of WiFi access points using a GPS-equipped laptop. In this paper we i...