Satellite Code Division Array Antenna Multipath Error Resolution
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Solution Overview
Problem
Global navigation satellite systems (GNSS) face accuracy reduction due to multipath errors caused by ground obstacles, and user-centered array antennas are cumbersome and difficult to process signals effectively.
Innovation Solution
A navigation satellite device using a code division transmission array antenna allocates different spread spectrum codes to each antenna, determining which antennas to use as transmission-end antennas and arranging them at specific coordinates to transmit signals through multiple paths to a reception-end antenna, effectively processing signals without multipath errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a user-centered array antenna is used to overcome multipath errors, then location determination accuracy is improved, but the device size increases and portability becomes difficult
Solution Approach 1:
The patent inverts the traditional approach by placing the array antenna at the transmission end (satellite) rather than the reception end (user device). The satellite transmits signals through multiple paths using array antenna technology, while the user device receives these signals through a single antenna. This inversion allows the benefits of array antenna processing to be achieved without the burden of carrying a large antenna array at the user end.
2Measurement precision
If a user-centered array antenna is used to improve signal processing, then location determination accuracy is improved, but signal processing complexity increases significantly
Solution Approach 1:
The patent shifts the signal processing complexity from the user device to the satellite. The satellite performs array antenna signal processing and transmits processed signals, while the user device simply receives the signals through a single antenna. This inversion dramatically reduces the processing complexity at the user end while maintaining location determination accuracy.
Solution Approach 2:
The patent creates multiple signal copies through different transmission paths from the satellite's array antenna. Each antenna element transmits a copy of the navigation signal with different spreading codes, and these copies travel through different paths to reach the user device, enabling the user to receive multiple signal versions without complex processing.
3Measurement precision
If multiple spread spectrum signals are transmitted from array antennas to eliminate multipath errors, then signal accuracy is improved, but the system complexity at the transmission end increases
Solution Approach 1:
The patent segments the transmission function by dividing the array antenna into multiple independent elements, each transmitting signals with different spreading codes. This segmentation allows the complex task of multipath error elimination to be distributed across multiple simple transmission channels, reducing the complexity of each individual transmission element while maintaining overall system accuracy.
Data Source
AI summary
The present invention relates to a device for operating a navigation satellite on the basis of a code division transmission array antenna and a method for operating a navigation satellite. The device for operating a navigation satellite on the basis of a code division transmission array antenna, according to the present invention, comprises: a code generation unit for allocating a spread spectrum code to each of a plurality of antennas; a determination unit for determining, as transmission-end antennas, at least some of the plurality of antennas, to which different spread spectrum codes are allocated; and a processing unit, which arranges each of the transmission-end antennas at predetermined coordinates such that a plurality of signals transmitted from the transmission-end antennas are transmitted to reception-end antennas through multiple paths.