GNSS Single-Sidelobe Processing for Reduced Bandwidth Tracking

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Solution Overview

Problem

The next generation of Global Navigation Satellite System (GNSS) signals require higher sampling rates, leading to increased resource demands, susceptibility to interference, and complexity in tracking multiple signal correlation peaks, causing range measurement errors and difficulties in multipath signal interactions.

Innovation Solution

A method and apparatus that reduce the resources needed for processing these signals by translating a GNSS signal with two sidelobes to a signal with a single sidelobe, using a numerically controlled oscillator with or without phase correction, and reducing the sampling rate to achieve a GPS-like correlation function, thereby mitigating interference and simplifying signal processing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Difficulty of detecting and measuring

If higher sampling rates are used to process next generation GNSS signals, then signal processing capability is improved, but receiver memory capacity and resource requirements increase

Engineering Contradiction:

Improvesignal processing capabilityVSAvoidreceiver memory capacity

Core Design Contradiction:

Difficulty of detecting and measuringVSQuantity of substance

Solution Approach 1:

The patent segments the signal processing task by separating the correlation function into multiple smaller correlation functions. This allows processing at lower sampling rates by dividing the overall correlation operation into staged processing steps, reducing the memory capacity required while maintaining signal detection capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transforms the signal processing approach by moving from direct high-rate sampling to a multi-stage correlation method that processes signals through different functional dimensions. This dimensional transformation enables equivalent processing capability with reduced sampling rates and corresponding memory requirements.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Difficulty of detecting and measuring

If higher sampling rates are used, then signal processing capability is improved, but susceptibility to interference increases due to wider bandwidth

Engineering Contradiction:

Improvesignal processing capabilityVSAvoidsusceptibility to interference

Core Design Contradiction:

Difficulty of detecting and measuringVSObject-affected harmful factors

Solution Approach 1:

By segmenting the correlation function into multiple smaller functions processed at lower sampling rates, the patent reduces the effective bandwidth required for processing. This segmentation approach maintains signal detection capability while narrowing the processing bandwidth, thereby reducing susceptibility to wideband interference.

Inventive Principle:

Principle #1Segmentation

3Difficulty of detecting and measuring

If higher sampling rates are used, then signal processing capability is improved, but tracking multiple signal correlation peaks becomes more difficult

Engineering Contradiction:

Improvesignal processing capabilityVSAvoidtracking complexity

Core Design Contradiction:

Difficulty of detecting and measuringVSDevice complexity

Solution Approach 1:

The patent divides the complex correlation function into multiple simpler correlation functions that are processed sequentially or in parallel at lower sampling rates. This segmentation simplifies the tracking of correlation peaks by breaking down the complex single-stage correlation into manageable multi-stage processing steps, reducing overall tracking complexity.

Inventive Principle:

Principle #1Segmentation

4Difficulty of detecting and measuring

If more complex correlation functions are used, then signal processing capability is improved, but range measurement error increases

Engineering Contradiction:

Improvesignal processing capabilityVSAvoidrange measurement error

Core Design Contradiction:

Difficulty of detecting and measuringVSMeasurement precision

Solution Approach 1:

The patent segments the complex correlation function into multiple simpler correlation functions processed in stages. This segmentation maintains the overall signal processing capability while reducing range measurement errors by avoiding the direct use of highly complex correlation functions at high sampling rates. The multi-stage approach allows for better error control and signal averaging.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS9784845B2Method and apparatus for implementing reduced bandwidth processing of navigation satellites

Publication Date: 2017.10.10 SAMSUNG ELECTRONICS CO LTD

AI summary

A method and apparatus for processing navigational signals with reduced bandwidth by receiving a combination of two navigational signals, reducing the frequency of the combined two navigational signals to an intermediate frequency (IF); converting the IF signal to digital signals; translating the frequency of the IF signal to near baseband; filtering the near baseband signal; reducing the sample rate of the filtered near-baseband signal by a factor; translating a selection of the reduced, filtered, near-baseband signal to a single sidelobe; storing the single sidelobe in memory; and processing the single sidelobe for navigational purposes.