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1.发明公开公开(公告)号：US20240295663A1
公开(公告)日：2024-09-05
申请号：US18441018
申请日：2024-02-14
发明人： Naser EL-SHEIMY , Yiran LUO
CPC分类号： G01S19/246 , G01S19/29 , G01S19/30 , G01S19/37 , G01S19/396
摘要： Snapshot receiver that comprises a correlator module for correlating incoming GNSS signals and a transform module that transforms resulting correlated outputs using a Fractional Fourier Transform (FrFT) process, to thereby compensate for weak and dynamic signals. The output of the transform module is an estimated Doppler rate with high accuracy. The estimated Doppler rate is passed to a super-resolution-measurement (SRM) module, which outputs error values of the estimated Doppler rate and a pseudorange (measured distance-to-satellite) via a phase dead reckoning (DR) calculation for the snapshot receiver. The pseudorange and error values are passed to a navigator module that determines position information based on those inputs. In some embodiments, the SRM module comprises a maximum likelihood estimator (MLE).
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公开(公告)号：US20240361468A1
公开(公告)日：2024-10-31
申请号：US18646965
申请日：2024-04-26
发明人： Naser EL-SHEIMY , Yiran LUO
摘要： Systems and methods for determining a user's absolute acceleration/deceleration on an Earth based reference frame. Signals from multiple satellites are received and the Doppler rate for each satellite is extracted using baseband signal processing. Then, using each satellite's ephemeris, the acceleration/deceleration and Earth frame position of each satellite is determined. The user's absolute position is then used, along with each satellite's position to calculate direction cosine vector projections for each satellite. The user's absolute acceleration/deceleration is then calculated using the various direction cosine vector projections, the various satellite acceleration/deceleration values, and each satellite's Doppler rates. The resulting absolute acceleration/deceleration can then be used for more accurate navigation solutions.
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