Multichannel Synchronous GNSS Analysis for Lower-Cost Acquisition
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Solution Overview
Problem
Existing methods for acquiring and identifying Global Navigation Satellite System (GNSS) signals require significant time and costly hardware components, necessitating a more efficient and cost-effective solution.
Innovation Solution
A multichannel synchronous signal analysis system (MSSAS) that processes signals from multiple antennas and RF paths using a CPU-controlled multiplexer, filters, and decimators, with a CPU managing communication modems and navigation channels to reduce hardware requirements and processing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional interference suppression methods using FFT modules and multiple processing components are employed, then signal processing capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple signal processing functions (FFT processing, interference detection, nulling, IFFT processing, correlation, and filtering) into a single integrated processor. This consolidation maintains the full signal processing capability while reducing the number of separate hardware components, directly addressing the contradiction between processing capability and device complexity
Solution Approach 2:
The integrated processor is designed to perform multiple functions including Fast Fourier Transform, interference detection, nulling operations, Inverse Fast Fourier Transform, correlation processing, and filtering. This multi-functional approach allows a single component to replace what would traditionally require multiple specialized components, reducing overall system complexity while maintaining processing capability
2Measurement precision
If multiple separate processing modules are used for interference detection and suppression, then signal acquisition accuracy is improved, but processing time increases
Solution Approach 1:
The system performs Fast Fourier Transform processing and interference detection in parallel before the correlation step. By completing these preprocessing operations ahead of time, the system maintains high signal acquisition accuracy while reducing the overall processing time required for GNSS signal acquisition and interference suppression
3Measurement precision
If comprehensive interference suppression processing is implemented, then signal identification accuracy is improved, but hardware cost increases
Solution Approach 1:
The patent integrates comprehensive interference suppression functions including FFT processing, interference detection, nulling, IFFT processing, correlation, and filtering into a single processor unit. This merging maintains full signal identification accuracy while significantly reducing hardware cost by eliminating the need for multiple separate processing modules
Data Source
AI summary
An apparatus includes an antenna, RF path, Analog to Digital convertor (ADC), filter, and navigation channel for processing a received GNSS signal based on a navigation clock. A communication modem is configured to receive the signal via a first antenna, RF path, and ADC and process the received signal in order to generate a signal based on a modem clock. The communication modem is further configured to transmit the signal based on the modem clock using a R+1 antenna via a R+1 RF path and a Digital to Analog Convertor (DAC). A multichannel synchronous signal analysis system (MSSAS) receives outputs of the ADCs and processes them using a plurality of decimators and plurality data receivers. Each of the decimators is configured to process the outputs of the ADCs and output data to one of a plurality of data receivers. A CPU is configured to control all of the devices.