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Cross-correlation mitigation algorithm for gnss systems using common covering codes

A covering code and mask technology, applied in the field of cross-correlation mitigation algorithms for GNSS systems using public covering codes, can solve the problems of increasing position estimation time and accuracy loss

Inactive Publication Date: 2018-06-29
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This adds time and accuracy loss in position estimation

Method used

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  • Cross-correlation mitigation algorithm for gnss systems using common covering codes
  • Cross-correlation mitigation algorithm for gnss systems using common covering codes
  • Cross-correlation mitigation algorithm for gnss systems using common covering codes

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Embodiment Construction

[0020] In some embodiments, the disclosed systems, devices and methods improve the ability to detect weak power signals from satellites (SVs). figure 1 An example is shown where a receiver (eg, in mobile device 105 ) can receive signals from a set of SVs 110 to estimate its position. Mobile device 105 may include any device that user 115 is likely to carry with him and that can communicate with SV 110 as described herein. Mobile device 105 may include, for example, a telephone, smartphone, electronic device, or laptop. In some examples, non-mobile devices and / or vehicle accessories may be used in place of mobile device 105 .

[0021] SV 110 may be a component of one or more Global Navigation Satellite Systems (GNSS), such as BeiDou, Global Positioning System (GPS), or Galileo El. Each SV can transmit a signal that can contain GNSS data bits, a pseudorandom noise (PRN) code (e.g., unique to a given SV) and possibly also a cover code (e.g., Newman-Huffman code). ) modulated c...

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Abstract

The present invention provides methods and systems for evaluating Global Navigation Satellite System (GNSS) signals. Each of a first GNSS signal received by a GNSS receiver and a second GNSS signal received by the GNSS receiver is accessed. The second GNSS signal can have weaker temporal fluctuations than the temporal fluctuations in the first GNSS signal. A delay between a sequence in the first GNSS signal and a corresponding sequence in the second GNSS signal is estimated and the delay is compared to a threshold. When it is determined that the delay exceeds the threshold, a position is estimated using both the first GNSS signal and the second GNSS signal.

Description

Background technique [0001] In the Global Navigation Satellite System (GNSS), artificial satellites (SV) transmit signals, which are received by receivers. For each SV, the SV and the receiver generate an identical pseudorandom noise (PRN) code. The codes generated for each SV are different, but not orthogonal to each other. After detecting a signal, the receiver can cross-correlate the signal with each of a set of PRN codes. Based on the results of the cross-correlation, the receiver can estimate which SV transmitted the signal and the time it takes for the signal to propagate from the SV to the receiver. The receiver can then use a set of these estimates, each associated with a different signal and SV, to estimate the distance between the receiver and each SV in the set. Based on these differences and the known position of the SV, the receiver can estimate its position. [0002] In many GNSSs, all SVs share the same frequency band. Depending on the propagation condition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/21G01S19/30
CPCG01S19/21G01S19/30G01S19/42
Inventor 黄东英埃米利娅·米洛拉德·希米奇蒂莫西·保罗·帕尔斯
Owner QUALCOMM INC