The Soviet VLF Navigation System

Peterson, Benjamin

doi:10.1002/j.2161-4296.1991.tb01858.x

Cited by 6 publications

(3 citation statements)

References 3 publications

(1 reference statement)

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“…The Alpha navigation system contains five stations, including one main station and four secondary stations, and the working area covers approximately 70% of the world. The transmitter power of each station is approximately 200-250 kW, and the antenna radiation power ranges from 50 to 80 kW [24,25]. The positioning accuracy of the system is in the range of 2-4 n mile.…”

Section: Signal Format For Alpha Navigation Systemmentioning

confidence: 99%

Research on an Alpha Navigation Signal Detection Method Based on Multichannel Orthogonal Correlation

Yan,

Li,

et al. 2024

Applied Sciences

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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.

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Section: Signal Format For Alpha Navigation Systemmentioning

confidence: 99%

Research on an Alpha Navigation Signal Detection Method Based on Multichannel Orthogonal Correlation

Yan,

Li,

et al. 2024

Applied Sciences

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“…The Omega system had an accuracy of two to four nautical miles . A Soviet system like Omega existed as well . The Omega system was deactivated in 1997 in favor of GPS.…”

Section: Introductionmentioning

confidence: 99%

“…4 A Soviet system like Omega existed as well. 5 The Omega system was deactivated in 1997 in favor of GPS. Recently, however, there has been a renewed interest in VLF navigation as an alternative to GPS-based navigation.…”

Section: Introductionmentioning

confidence: 99%

Navigation using VLF signals with artificial neural networks

2018

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This examines the use of very low frequency (VLF) electromagnetic signals with artificial neural networks (ANN) to estimate two‐dimensional location. The VLF source positions and type of signals are not known in advance. VLF signals were collected from the environment using a mobile antenna while the user manually tagged the true location. Data were collected over several months. The signals were divided into time segments, and features were generated for the ANN from the spectral power of the signals over time. The ANN uses long short‐term memory (LSTM) layers and fully connected layers and was trained using the time‐series spectral features of the VLF signal and the true location data. The position estimates are an indoor locale‐classification problem. Our task was to determine which of 50 rooms or hallway segments the sensor was in for a given building. The system achieved an average accuracy over 76% in determining discrete rooms or hallways. The approach achieved these exceptional accuracies with very little a priori knowledge of the VLF signals using only supervised learning.

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Numerical simulation of cycle slipping in diurnal variation of phase of VLF field

Perel¹,

Stesik²

1997

Radio Science

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Abstract. A simulation of diurnal variation of the phase of VLF field was carried out to investigate the phenomenon of cycle slipping which had been previously observed on transequatorial paths of southwest direction. We present a simulated curve of the diurnal phase variation demonstrating the slipping phenomenon. The simulated phase curve has a part where phase changes so greatly during a few minutes that it produces a cycle slipping. We give a qualitative explanation of this phenomenon in the frame of a crude adiabatic approach. We demonstrate that at just the moment of the abrupt change of the calculated phase at the receiver the main modes degenerate at some point on the path. The realignment of the distance dependencies of phase velocities and attenuation rates of the degenerating modes at the moment of degeneration is found to be a cause of the jump of the phase. We present also a quantitative description of the phase anomalies involving a consideration of the mode conversion.

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The Soviet VLF Navigation System

Cited by 6 publications

References 3 publications

Research on an Alpha Navigation Signal Detection Method Based on Multichannel Orthogonal Correlation

Research on an Alpha Navigation Signal Detection Method Based on Multichannel Orthogonal Correlation

Navigation using VLF signals with artificial neural networks

Numerical simulation of cycle slipping in diurnal variation of phase of VLF field

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