Joint Receiver for Adjacent Navigation Signals
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Solution Overview
Problem
Traditional joint receiving methods for navigation signals at separate frequencies fail to fully exploit signal potential and spectrum separation, limiting power and bandwidth gains, and thus hinder improved ranging performance.
Innovation Solution
A joint receiver and method that constructs a virtual wideband navigation signal with a virtual carrier and sub-carrier from navigation signals at adjacent frequencies, enabling power and bandwidth gains and enhancing ranging precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional joint receiving methods treat navigation signals as separate entities, then the implementation is simple, but the signal potential and bandwidth gain cannot be fully exploited
Solution Approach 1:
The patent merges two adjacent frequency navigation signals into a single virtual wideband signal by combining their in-phase and quadrature components. This merging allows the receiver to exploit both signals simultaneously, achieving bandwidth gain and improved ranging precision while maintaining a unified processing framework that does not significantly increase complexity
Solution Approach 2:
The patent transforms the frequency domain separation into a unified time-domain representation by constructing a virtual wideband signal. This dimensional transformation allows the receiver to process adjacent frequency signals as if they were time-shifted versions of the same signal, enabling full exploitation of signal potential without requiring complex frequency-domain processing
2Power
If separate signal processing is used, then the device complexity is low, but power gain and bandwidth gain are limited
Solution Approach 1:
The patent combines the power contributions of two adjacent frequency signals by merging their processed outputs into a single ranging measurement. This merging achieves power gain by utilizing the total energy from both signals simultaneously, while the unified processing approach keeps the complexity increase manageable
3Measurement precision
If separate signal processing is used, then implementation is straightforward, but ranging performance cannot be further improved
Solution Approach 1:
The patent achieves improved ranging precision by transforming the problem into the time domain, where adjacent frequency signals are treated as time-shifted versions of the same waveform. This dimensional change enables the use of correlation-based ranging methods on the virtual wideband signal, achieving centimeter-level precision without requiring complex frequency-domain analysis
Data Source
AI summary
It is provided a joint receiver and receiving method for navigation signals located at adjacent frequencies. The joint receiving method includes: receiving a first navigation signal and a second navigation signal which are located at adjacent frequencies (S1); and calculating a frequency estimation of a virtual wideband navigation signal constructed based on the first navigation signal and the second navigation signal (S2), wherein the virtual wideband navigation signal is an asymmetric BOC-like navigation signal having a virtual carrier and a virtual sub-carrier. With the joint receiver and joint receiving method, not only power gain but also bandwidth gain can be obtained, and the ranging precision can be significantly improved.