Improved Inertial Measurement Unit-Aided GPS Signal Differential Acquisition Utilizing Frequency Estimation and Correction
An inertial measurement unit (IMU) aided GPS signal acquisition method utilizing frequency estimation and correction is proposed to enhance the sensitivity of baseband processing. With describing differential coherent acquisition technology, the relation between the performance of signal acquisition and frequency estimation errors is analyzed. The approximate search range of frequency space could be obtained by speed and other information in GPS receiver with IMU-assisted. To further determine the search space of frequency-domain, stochastic errors of carrier Doppler estimation caused by IMU and oscillators are corrected utilizing auto regressive moving average (ARMA) method. This accuracy Doppler information is utilized to affect the values of local code phase and local carrier generators with differential coherent acquisition. Simulation results indicate that signal to noise ratio (SNR) for improved method with IMU is 4 dB higher than non-coherent method, and 2.5 dB higher than the standard difference method, better satisfying the requirements of GPS signal acquisition in weak signal environments.
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Document Type: Research Article
Publication date: 2011-10-01
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