The device is for monitoring the integrity of the position and speed information supplied by a hybrid system comprising an inertial unit INS readjusted using a GNSS satellite positioning receiver by means of a Kalman hybridization filter using a readjustment gain K and an evolution matrix F. It includes a satellite problem-detector circuit comprising a bank of predictor/estimator filters which uses the gain K and the evolution matrix F of the Kalman hybridization filter, each filter observing th...

Mechanisms and techniques provide a system to evaluate operational integrity of a data processing system such as an area augmentation system by obtaining at least one set of distribution data related to information processed by the data processing system. The set(s) of distribution data can include corrections information and integrity bounds information related to the corrections information. The system applies a moment generating function to the set of distribution data to produce a moment bou...

A method for reducing master antenna tracking errors in a multiplexing GPS receiver resulting in a differential phase measurement scheme which is insensitive to the master antenna tracking loop errors is disclosed. The master antenna tracking loop error at a given update K is subtracted from a phase measurement associated with a slave antenna signal at update K. The method comprises the determination of interpolation coefficients by which the master antenna tracking loop errors are weighted in o...

A method and apparatus are provided for predicting the position error bound in a satellite positioning system at a future time. The future position of each satellite at the future time is calculated from the trajectory data obtained from each satellite. The predicted position for each satellite and the estimated position of the satellite positioning system receiver is then used to generate a line of sight matrix at the future time from which a position error bound is determined.

A lift truck with pivoted lift forks in which each lift fork has a pivot connection mounting the fork adjacent the base of a carriage in the lift truck. The pivot connection accommodates swinging of the fork between lowered and raised positions. An upright hydraulic ram disposed rearwardly of the pivot connection for the fork is provided for swinging the fork. The ram is connected to the fork through a movable link which moves to a position releasably holding the fork in its raised position on a...

In an industrial lift truck of the kind having a mast assembly, a load-lifting carriage mounted for sliding movement up and down the mast, and a load support carried on the carriage, the load support being capable of being moved transversely of the truck by means provided for this purpose, the load-lifting carriage comprises a rear part mounted on the mast assembly and a front part carrying the load support, the front part being pivotally connected to the rear part to pivot about a horizontal tr...

It is known to provide a pre-stressed frame for a hydraulic press in which the frame has two opposed cross-heads with thrust members spacing the cross-heads apart and traction members drawing the cross-heads against the thrust members and thus pre-stressing the frame. There is provided a simpler construction which is easier to manufacture, and which is not so susceptible to notch stresses, by having the traction members in the form of plates.

A press framework consisting of a top section, a table section and frames receiving the ends of these sections. The frames are formed of hollow columns, bridgepieces contacting the ends of the columns and stays passing through the hollow columns and bracing the bridgepieces with respect to the hollow columns.

A method and means for enhancing the position accuracy of a civil or degraded accuracy GPS receiver by compensating for errors in its position solution with data derived from a military, or precise accuracy, GPS receiver, wherein the civil GPS receiver may be disposed in a mobile expendable vehicle and the military receiver in a mobile launch vehicle. The compensating data is obtained by a comparison of the pseudorange measurements of the military GPS set and another civil GPS set disposed with ...

The invention is a method for determining the relative position and velocity of a second vehicle with respect to a first vehicle. The method is practiced on board the second vehicle and utilizes a plurality of satellite transmitters and an inertial measurement unit on the second vehicle. The first vehicle has available a plurality of data items consisting of the first vehicle's measured position, measured velocity, and specific-force acceleration. The second vehicle has available data items cons...