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Comparison of L1 and L5 Bands GNSS Signals Acquisition.
Jérôme Leclère1, René Landry2, Cyril Botteron3
1LASSENA, École de Technologie Supérieure (ÉTS), 1100 Notre-Dame Street West, Montreal, QC H3C 1K3, Canada. jerome.leclere@lassena.etsmtl.ca.
Sensors (Basel, Switzerland)
|August 26, 2018
Summary
Acquiring Global Navigation Satellite System (GNSS) L5 band signals can be more complex than L1, depending on conditions. Precise Doppler assistance can reduce L5 signal acquisition complexity below L1.
Area of Science:
- Satellite Navigation Systems
- Signal Processing
- GNSS Receiver Technology
Background:
- Civilian Global Navigation Satellite System (GNSS) signals are now accessible on both L1 and L5 bands.
- The close relationship between carrier Doppler and code delay in signals from the same satellite makes independent acquisition unnecessary.
- Existing assumptions favor L1 band signal acquisition, but a comprehensive comparison is lacking.
Purpose of the Study:
- To compare the complexity of acquiring L1 and L5 band GNSS signals.
- To quantify the processing time and memory requirements for acquiring GPS L1 C/A, GPS L5, Galileo E1, and Galileo E5a/b signals.
- To evaluate acquisition complexity in hardware receivers utilizing parallel code search.
Main Methods:
- Comparative analysis of GNSS signal acquisition algorithms.
- Performance evaluation based on processing time and memory usage.
- Consideration of hardware receiver architectures and parallel processing techniques.
Main Results:
- L5 band signals generally exhibit higher acquisition complexity compared to L1 signals.
- Galileo E5 signals are consistently more complex to acquire than E1 signals.
- Under specific conditions, particularly with accurate Doppler assistance, L5 signal acquisition complexity can be reduced to be comparable to or less than L1.
Conclusions:
- The complexity of GNSS signal acquisition is band-dependent, with L5 signals often posing greater challenges.
- Signal characteristics, such as power and Doppler, influence acquisition complexity.
- Optimized assistance data, especially precise Doppler information, can significantly enhance L5 signal acquisition efficiency.
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