Method and apparatus for autonomous, in-receiver prediction of gnss ephemerides

A receiver and automatic technology, applied in the field of broadcast ephemeris prediction satellite ephemeris, can solve the problems of complicated earth orientation following, and achieve the effect of reducing the first positioning time, eliminating the need, and reducing the signal acquisition.

Active Publication Date: 2011-10-05
CALIFORNIA INST OF TECH
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Problems solved by technology

However, Earth orientation follows

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  • Method and apparatus for autonomous, in-receiver prediction of gnss ephemerides

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Embodiment Construction

[0033] In accordance with the present invention, means are described for automatically providing signal acquisition assisted by GNSS receivers by predicted GNSS orbit and clock states using only inherent receiver resources, without the need for externally provided information other than factory installed information and methods.

[0034] Such as figure 2 As shown, the auto-assisted GNSS receiver (210) according to the present invention includes: a radio frequency (RF) part (202), which acquires GNSS signals; and a digital part (205), including a CPU (207) and a non-volatile memory (204 ). The digital portion (205) may be shared by a host device such as a personal navigation device (eg, a cell phone or car navigation device). The CPU (207) can be implemented in various ways without limiting the applicability of the invention. These means include, but are not limited to: microprocessors, field programmable gate arrays (FPGAs), or application specific integrated circuits (ASIC...

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Abstract

Methods and apparatus for autonomous in-receiver prediction of orbit and clock states of Global Navigation Satellite Systems (GNSS) are described. Only the GNSS broadcast message is used, without need for periodic externally-communicated information. Earth orientation information is extracted from the GNSS broadcast ephemeris. With the accurate estimation of the Earth orientation parameters it is possible to propagate the best-fit GNSS orbits forward in time in an inertial reference frame. Using the estimated Earth orientation parameters, the predicted orbits are then transformed into Earth-Centered-Earth-Fixed (ECEF) coordinates to be used to assist the GNSS receiver in the acquision of the signals. GNSS satellite clock states are also extracted from the broadcast ephemeris and a parametrized model of clock behavior is fit to that data.; The estimated modeled clocks are then propagated forward in time to enable, together with the predicted orbits, quicker GNSS signal acquision.

Description

[0001] Statement of Grant of Patent by the Government [0002] The invention described herein is the result of research under a NASA contract, and the contractor has elected to own the invention pursuant to Public International Law 96-517 (35 USC 202). technical field [0003] The present disclosure relates to satellite based positioning systems and methods. More specifically, the present invention relates to methods and apparatus for predicting satellite ephmerides (including orbits and clock states) using broadcast ephemeris obtained directly from global navigation satellites (without external data communication). Background technique [0004] Navigation signals from Global Navigation Satellite Positioning Systems (GNSS), such as Global Positioning System (GPS) and GLONASS, are used by GNSS receivers to provide positioning, navigation, and timing (PNT) services, and various related applications. [0005] As shown in Figure 1, a GNSS receiver (110) generally includes: a ra...

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Application Information

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IPC IPC(8): G01S19/27G01S19/13
CPCG01S19/27
Inventor 约阿兹·E·巴-谢韦尔威廉·I·贝蒂格尔
Owner CALIFORNIA INST OF TECH
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