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Dempster
Andrew G. Dempster, Coogee AU
| Patent application number | Description | Published |
|---|---|---|
| 20090102709 | SATELLITE-BASED POSITIONING SYSTEM IMPROVEMENT - A method, device and system for determining a receiver location using weak signal satellite transmissions. The invention involves a sequence of exchanges between an aiding source and a receiver that serve to provide aiding information to the receiver so that the receiver's location may be determined in the presence of weak satellite transmissions. With the aiding information, the novel receiver detects, acquires and tracks weak satellite signals and computes position solutions from calculated pseudo ranges despite the inability to extract time synchronization date f, 'n the weak satellite signals. The invention includes as features, methods and apparatus for the calibration of a local oscillator, the cancellation of cross correlations, a Doppler location scheme, an ensemble averaging scheme, the calculation of almanac aiding from a table of orbit coefficients, absolute time determination, and a modified search engine. | 04-23-2009 |
| 20090109088 | SATELLITE-BASED POSITIONING SYSTEM IMPROVEMENT - A method, device and system for determining a receiver location using weak signal satellite transmissions. The invention involves a sequence of exchanges between an aiding source and a receiver that serve to provide aiding information to the receiver so that the receiver's location may be determined in the presence of weak satellite transmissions. With the aiding information, the novel receiver detects, acquires and tracks weak satellite signals and computes position solutions from calculated pseudo ranges despite the inability to extract time synchronization date f, 'n the weak satellite signals. The invention includes as features, methods and apparatus for the calibration of a local oscillator, the cancellation of cross correlations, a Doppler location scheme, an ensemble averaging scheme, the calculation of almanac aiding from a table of orbit coefficients, absolute time determination, and a modified search engine. | 04-30-2009 |
| 20090128403 | SATELLITE-BASED POSITIONING SYSTEM IMPROVEMENT - A method, device and system for determining a receiver location using weak signal satellite transmissions. The invention involves a sequence of exchanges between an aiding source and a receiver that serve to provide aiding information to the receiver so that the receiver's location may be determined in the presence of weak satellite transmissions. With the aiding information, the novel receiver detects, acquires and tracks weak satellite signals and computes position solutions from calculated pseudo ranges despite the inability to extract time synchronization date f, 'n the weak satellite signals. The invention includes as features, methods and apparatus for the calibration of a local oscillator, the cancellation of cross correlations, a Doppler location scheme, an ensemble averaging scheme, the calculation of almanac aiding from a table of orbit coefficients, absolute time determination, and a modified search engine. | 05-21-2009 |
Andrew Graham Dempster, Coogee AU
| Patent application number | Description | Published |
|---|---|---|
| 20090058705 | Satellite Radio Navigation Receiver - In a satellite radio navigation receiver receiving a transmitted radio navigation signal, a method of removing I/Q-mismatches in the received signal, comprising: resolving the received signal into I and Q signal component, and providing them as inputs to a demixing stage which removes unwanted signals, the demixing stage including first and second cross-coupled adaptive filters, whose coefficients are updated by the outputs of the demixing stage, the outputs of the demixing stage representing an IQ mismatch corrected signal. The coefficients are updated only by the polarity values of the outputs, resulting in great simplification. The receiver may be a zero-IF or low-IF receiver, and may operate on time domain or frequency domain signals. | 03-05-2009 |
Brian Dempster, Victoria AU
| Patent application number | Description | Published |
|---|---|---|
| 20090188101 | A Method and Apparatus For Joining Metal Using Self-Piercing Rivets With Preheating - A method for joining elements together, the method comprising the steps of: positioning the elements relative to one another; enhancing the formability of at least a portion of at least one of the elements using a laser; and joining the elements together using a mechanical fastening method. | 07-30-2009 |
David Forbes Dempster, Inverary CA
| Patent application number | Description | Published |
|---|---|---|
| 20090124149 | HIGH TENACITY LOW SHRINKAGE POLYAMIDE YARNS - Multi-filament polyamide yarns characterized by high tenacity and low shrinkage are disclosed. Such yarns or fabrics made therefrom can be used in industrial applications in which such a combination of properties is desirable. Such yarns are particularly useful in the manufacture of automobile airbag fabrics. Also disclosed is a process for making such yarns. The yarn manufacturing process involves spin-drawing molten nylon, relaxing and controlling the yarn tension, and then winding the yarn. Yarns made according to this process exhibit linear density in the range of 110-940 decitex, tenacity equal to or greater than 80 cN/tex, and shrinkage, measured at 177° C., of less than 5%. | 05-14-2009 |
Michael Alan Howarth Dempster, Birmingham GB
| Patent application number | Description | Published |
|---|---|---|
| 20110131023 | Computer Systems for Data Manipulation and Related Methods - A computer system for data management arranged to provide at least four components: a generator component, a solver component, a simulation component and a visualisation component, wherein the simulation component is arranged to simulate stochastic processes and output simulation data of the simulated process to the generator component; the generator component is arranged to process a model input thereto and to generate a Dynamic Stochastic Program (DSP) therefrom and also to process the simulation data received from the simulation component and output the DSP together with the processed simulation data to the solver component; the solver component being arranged to receive the DSP and the processed simulation data and to process the DSP together with the simulation data; and the visualisation component being arranged to allow the data being processed by the solver to be visualised. | 06-02-2011 |