LEO Broadband Navigation Signals With Shared Spectrum Anti-Jamming
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Solution Overview
Problem
Conventional GNSS systems face challenges in maintaining anti-jamming ability and coverage due to narrow bandwidths and weak signal reception, particularly in occluded and attenuated environments.
Innovation Solution
A navigation method and system utilizing a low-orbit broadband internet constellation that transmits navigation and communication signals using shared spectrum resources and channels, leveraging wider communication bandwidths and high-antenna gain terminals to enhance signal reception and anti-jamming capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sets of satellite multi-beam antennas are controlled to point to the target region to focus power, then the signal receiving power is improved and anti-jamming ability is enhanced, but the coverage region of the GNSS signal is reduced
Solution Approach 1:
The patent applies multi-functionality by enabling communication satellites to provide both communication services and navigation services simultaneously. The navigation signal is embedded within communication signals, allowing the same satellite infrastructure to serve dual purposes: maintaining wide coverage for communication while providing navigation signals with sufficient power for anti-jamming capability.
Solution Approach 2:
The patent merges navigation signals with communication signals by embedding navigation information within the communication signal framework. This combination allows the navigation signal to leverage the wide coverage of communication satellites while maintaining adequate signal power through the integrated transmission structure.
2Area of stationary object
If conventional GNSS signals are transmitted with wide coverage, then the coverage region is maintained, but the signal receiving power is weak and anti-jamming ability is poor
Solution Approach 1:
The patent enables communication satellites to perform both communication and navigation functions simultaneously. By embedding navigation signals within communication signal transmissions, the system maintains wide coverage inherent to communication satellites while providing navigation signals with sufficient power spectral density for anti-jamming capability.
Solution Approach 2:
The patent changes the spectral parameters by utilizing the wider bandwidth available in communication signals compared to traditional narrowband GNSS signals. This bandwidth expansion allows the navigation signal to achieve better anti-jamming performance through spectral spreading while maintaining wide geographic coverage.
Data Source
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AI summary
A navigation method and system employing a low-orbit broadband Internet constellation. The method comprises: receiving a satellite navigation broadcast message or an accuracy message uploaded by a ground gateway station, and generating a first navigation signal according to the navigation broadcast message or the accuracy message (S101); generating a first communication signal according to a preset communication payload, and generating a second navigation signal according to the first communication signal and the first navigation signal, wherein the second navigation signal and the first communication signal are simultaneously distributed by means of sharing a frequency spectrum resource and a transmit channel (S102); and sending, to a terminal, the second navigation signal on a preset communication resource (S103), such that the terminal performs positioning, navigation and timing on the basis of the second navigation signal. The invention solves the technical problem in the art in which a navigation signal has poor anti-interference capability.