CROSSBOW TECHNOLOGY, INC. Patent applications |
Patent application number | Title | Published |
20120232847 | High Accuracy And High Dynamic Range MEMS Inertial Measurement Unit With Automatic Dynamic Range Control - Embodiments relate to a MEMS IMU having an automatic gain control. The dynamic measurement range of the MEMS IMU is controlled by controlling the gain of a signal amplifier before the analog to digital converter (ADC) to make full use of the ADC range. In one embodiment, two or more MEMS inertial sensor sets are installed in the IMU. One of the sensor sets is for high accuracy with low dynamic range, and the other set or sets is for higher dynamic range with less resolution or accuracy. In one implementation, a digital processor determines which of the sensor sets to be used according to the system dynamic estimation. In another implementation, the system weights the sensor outputs from the sensor sets according to the system dynamics. | 09-13-2012 |
20120232832 | Inertial Sensing With Spatially Distributed Sensor Array And Two Dimensional Data Processing - A spatially distributed MEMS inertial sensor array is designed to reduce or cancel measurement errors and to increase the signal detection accuracy. By combining the measurements from a pair of sensors having sensing axes in two different, non-orthogonal directions, the correlated error due to the environmental changes are cancelled or reduced and the uncorrelated random noise is also reduced by the square root of two. By sequentially sampling the sensor array in the time domain, the number of the ADC circuits can be largely reduced. A two dimensional signal processing method is used to process the sensor array output data, in order to further reduce the remaining errors. Namely, one dimension uses the outputs from multiple spatially distributed sensor sets and the other dimension is the time domain. The signal to noise ratio is increased by using the signal correlation in both the spatial domain and the time domain. | 09-13-2012 |
20120161958 | POWER MANAGEMENT IN WIRELESS TRACKING DEVICE OPERATING WITH RESTRICTED POWER SOURCE - A wireless tracking device operating in at least two modes to reduce power consumption and extend the operable period of the wireless tracking device. In an active mode, the wireless tracking device samples sensor signals at a higher resolution and may also actively communicate with a remote device via wireless connection. In a hibernation mode, most of the components or modules in the wireless tracking device are shut down to reduce power consumption. The wireless tracking device may switch to the active mode when a predetermine event is detected. | 06-28-2012 |
20120041703 | Temperature Measurement Correction Using Multiple Temperature Sensors - Correcting a temperature measurement of a target sensed at one temperature sensor in an asset tracking device by using another temperature sensor. The asset tracking device includes at least one heat source that affects the temperature sensor for sensing the temperature of the target. The other temperature sensor measures temperature at a location in the asset tracking device. The relationships between an actual temperature of the target and the temperature measured at the two sensors are established through experiments or model. Using the relationships, the measured temperature of the target can be corrected to obtain a corrected temperature of the target. | 02-16-2012 |
20110283235 | RESULT-ORIENTED CONFIGURATION OF PERFORMANCE PARAMETERS - A plurality of configuration parameters for setting a device are determined by setting one or more performance parameters. The performance parameters are end-results of configuration that a user desires to achieve by setting the configuration parameters on a device. By setting the performance parameters instead of multiple configuration parameters, the user can conveniently achieve desired performance on the device without having to try many combinations of configuration parameters. When the user sets a performance parameter value, a set of configuration parameters corresponding to the performance value is computed or retrieved. The performance parameters may be set using a user interface element such as a slider that is intuitive and easy to manipulate. | 11-17-2011 |
20100159857 | ENHANCING ANTENNA PERFORMANCE IN RF DEVICES - Method and apparatus for improving RF signal performance of a battery-operated handheld device includes RF isolating the battery from DC-powered circuitry and actively incorporating the battery in RF signal transfers with respect to an RF antenna. | 06-24-2010 |
20090219011 | Correcting Offset in Magneto-Resistive Devices - Method and apparatus improve sensing accuracy and reduce bias shift in anisotropic magneto-resistive sensors using paired integrators and sampling switches for processing outputs of the sensor on applied set and reset signals with high immunity to temperature variations. | 09-03-2009 |