Pseudo-range-based reliable locating method of multimode GNSS receiver

Abstract

The invention discloses a pseudo-range-based reliable locating method of a multimode GNSS receiver. The multimode GNSS receiver receives GNSS satellite signals to primarily obtain pseudo ranges and navigation messages of the GNSS satellite signals, different types of pseudo ranges and navigation messages are unified to the same time and space coordinate, and the pseudo ranges and the navigation messages which are transformed in coordinate are subjected to error correction; when the number of visible satellites is 4 or more, the pseudo ranges which are measured actually are directly used for achieving locating resolving of the receiver; when the number of the visible satellites is not more than 3, the pseudo ranges are primarily extrapolated through generalized extended interpolation, and then the extrapolated pseudo ranges are used for achieving locating resolving of the receiver; when the number of the visible satellites is 5 or more, the multimode GNSS receiver achieves detection of autonomous integrity by adopting the odd-even vector method and the extended Kalman filter method or the nondestructive kalman filter method.

Description

technical field [0001] The invention belongs to the field of satellite navigation, and in particular relates to a reliable positioning method of a pseudorange-based multi-mode GNSS receiver. Background technique [0002] The number of available satellites of GNSS (Global Navigation Satellite System) receivers with multi-mode receiving function increases, and satellites with better geometric layout of satellites can be selected to achieve positioning calculations. Compared with receivers using a single system positioning, it will bring higher Positioning accuracy, availability, continuity, reliability and stability. With the development and maturity of satellite navigation technology and the expansion of navigation applications in military and civilian fields, multi-mode receivers will become the development direction of receivers. [0003] The research on GNSS receiver abroad is carried out simultaneously with the construction process of the American GPS and the Russian GLO...

AI Technical Summary

Problems solved by technology

At present, some domestic companies and some scientific research institutes have realized the chip-based GNSS multi-mode receiver from the RF front-end to the demodulation baseband. The developed GNSS dual / multi-mode receiver products have multiple positioning modes, positioning accuracy and Compared with the traditional single-frequency navigation receiver, the integrity has been greatly improved, but there are relatively few studies on multi-mode GNNS reliable positioning under the condition of no / less satellites, and no relevant research results have been seen.

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