Research on an Alpha Navigation Signal Detection Method Based on Multichannel Orthogonal Correlation
Source abstract
Abstract
The Alpha navigation system is the only operating radio system based on very-low-frequency (VLF) signals that can be used to research VLF navigation, timing, and ionospheric characteristics. The detection of the Alpha navigation signal is the key step in the Alpha receiver; however, the received Alpha navigation signal is susceptible to noise and mutual interference, which deteriorates signal detection performance. This paper presents a multichannel orthogonal correlation method for Alpha navigation signal detection. Once the three frequency signals of the Alpha navigation system are obtained using a notch filter, station identification is realized using a multichannel orthogonal correlation method and signal format. The selection of key parameters and the detection performance under noise and mutual interference are analyzed. This method’s detection probability exceeds 90% when the signal-to-noise ratio (SNR) is greater than −10 dB. The influence of mutual interference on the signal correlation peak is less than 1% when the signal-to-interference ratio (SIR) of the mutual interference is greater than −28 dB. The proposed method is verified using an actual signal collected using an Alpha receiver. The results show that an Alpha signal can be detected at an extremely low SNR. This method has strong practicability and satisfies the application requirements of an Alpha receiver.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Inertial Sensor and Navigation · Target Tracking and Data Fusion in Sensor Networks · Underwater Vehicles and Communication Systems
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China
Key Laboratory of Time Reference and Applications Chinese Academy of Sciences, Xi’an 710600, China
Laboratory of Science and Technology on Marine Navigation and Control, China State Shipbuilding Corporation, Tianjin 300131, China
Tianjin Navigation Instrument Research Institute, Tianjin 300131, China
Funding
Chinese Academy of Sciences (CAS) “Light of West China” Program · Open Fund Program of the Laboratory of Science and Technology on Marine Navigation and Control, China State Shipbuilding Corporation
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