Side Peak Tracking Detection in GNSS Baseband Channels
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Solution Overview
Problem
Conventional GNSS receivers face increased complexity and cost due to the need for multiple correlators to detect side peak tracking in baseband tracking channels, which can lead to biased pseudorange measurements.
Innovation Solution
A GNSS receiver with a baseband tracking channel that includes a prompt correlator with two integration registers and a side peak tracking detection module, which divides the pseudorandom noise code chip into parts for integration and generates information on side peak tracking, allowing the receiver to adjust and prevent locking to side peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional bump jumping technique is used to detect side peak tracking, then side peak tracking can be detected, but the baseband tracking channel design complexity increases due to the need for Very Early and Very Late correlators
Solution Approach 1:
The patent extracts the side peak detection function from the conventional five-correlator structure by removing the Very Early and Very Late correlators. Instead, it uses only the Prompt correlator with two integration registers (first and second integration registers) that process different portions of the PRN code chip. This extraction maintains side peak detection capability while reducing the number of correlators from five to one, thereby reducing baseband tracking channel design complexity.
2Device complexity
If fewer correlators are used in the baseband tracking channel, then device complexity is reduced, but the ability to detect side peak tracking may be compromised
Solution Approach 1:
The patent segments the PRN code chip into two distinct portions: a first portion processed by the first integration register and a second portion processed by the second integration register. By comparing the integration results from these two segments, the system can detect side peak tracking conditions. This segmentation allows side peak detection to be achieved with a single Prompt correlator instead of requiring multiple correlators, thus reducing device complexity while maintaining detection reliability.
Data Source
AI summary
A baseband tracking channel in a GNSS receiver is provided. The baseband tracking channel comprises: a code generator to generate a local signal correlating with an incoming signal received by the GNSS receiver; a multiplier that multiplies the local signal with a baseband signal corresponding to an incoming signal received by the GNSS receiver to generate a code removed signal; a prompt correlator including at least one integration register that integrates samples of the code removed signal corresponding to a first portion of each pseudorandom noise code chip of the code removed signal to provide a first integration register output, and integrates samples corresponding to a second portion of each PRN code chip to provide a second integration register output; and a side peak tracking detection module that generates information indicating when side peak tracking is occurring based on the first integration register output and the second integration register output.