Radio Signal Acquisition via Frequency Offset and Short Spreading Codes
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Solution Overview
Problem
Current Global Navigation Satellite Systems (GNSS) face challenges in efficiently acquiring and processing multiple radio signal components due to spectral overlap and interference, leading to degraded receiver performance and increased computational complexity.
Innovation Solution
The method involves applying a frequency offset to each radio signal component relative to a central carrier frequency, combined with the use of short spreading codes and optimized receiver processing to reduce bandwidth requirements and computational complexity while maintaining cross-correlation isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple radio signal components are transmitted in the same spectral region with spectral overlap, then the bandwidth efficiency is improved, but the Mutual Access Interference increases and receiver performance degrades
Solution Approach 1:
The patent applies frequency offset modulation to shift the carrier frequencies of different radio signal components relative to a central carrier frequency. This parameter change creates spectral separation while maintaining overall bandwidth efficiency, reducing the Mutual Access Interference between signals transmitted in the same spectral region.
2Reliability
If conventional GNSS signals with long spreading codes are used, then the cross-correlation isolation is improved, but the computational complexity and required processing time increase
Solution Approach 1:
The patent segments the signal processing by introducing frequency offset modulation that separates different radio signal components in the frequency domain. This allows the receiver to process signals with shorter spreading codes by utilizing frequency-domain separation, thereby reducing computational complexity while maintaining adequate cross-correlation isolation through the frequency offset mechanism.
3Measurement precision
If multiple radio signal components are processed simultaneously, then the position determination accuracy is improved, but the receiver power consumption increases
Solution Approach 1:
The patent uses frequency offset modulation to create spectral separation between multiple radio signal components. This parameter change enables the receiver to process multiple signals simultaneously with reduced interference, improving position determination accuracy while the efficient spectral utilization reduces the processing burden and associated power consumption compared to conventional approaches.
Data Source
AI summary
The present invention relates to a method, related devices and a related system for acquisition of at least one radio signal component of a plurality of radio signal components at a radio receiver, each radio signal component being transmitted by a respective radio transmitter of a plurality of radio transmitters, each radio signal component comprising a data signal carrier, for carrying a data signal component of said radio signal component, said data signal component comprising a spreading code, said spreading code comprising a predetermined number of chips (L), each chip of said spreading code having a duration wherein said predetermined number of chips is such that the criterion calculated as the ratio between the product of the radio receiver front-end bandwidth with the spreading code length and with the chip duration, and the overall number of radio signal components of the radio navigation system, shall not exceed 25.