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Implementation of Deeply Integrated GPS/Low-Cost IMU for Reacquisition and Tracking of Low CNR GPS Signals
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2004
Year
Automatic NavigationEngineeringLocation EstimationSatellite Signal ProcessingGlobal Navigation Satellite SystemPositioning SystemComputer EngineeringGps/imu SystemGps Signal IntegrationInstrumentationPrecision NavigationSignal ProcessingDeeply Integrated Gps/imuSignal IntegritySatellite Navigation Systems
A deeply integrated GPS/IMU system is developed to acquire and continuously track low Carrier-to-Noise Ratio (CNR) GPS signals, while maintaining carrier tracking performance at the mm-level. Reacquisition and tracking are demonstrated for 15 dB-Hz GPS signals without receivers for a number of applications (e.g. indoor applications or navigation in the presence of wideband interference). The deeply integrated GPS/IMU employs inertial aiding of the GPS signal integration to significantly increase the integration time interval as compared to conventional unaided receivers. As a result, requiring knowledge of navigation data bits. Initial, lowdynamic test results demonstrate the feasibility of the deeply integrated GPS/IMU system.