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A Satellite Overlay Communication Method Oriented to Safety Communication Requirements

A security-oriented technology for communication requirements, applied in the field of satellite communication, can solve problems such as difficult to solve security problems, difficult to obtain external useful mask signals, etc., to reduce computational complexity, reduce signal-to-interference noise ratio, and reduce exposure risks.

Active Publication Date: 2022-05-17
NANJING UNIV OF POSTS & TELECOMM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult for such terminals to obtain useful external cover signals, and the security issues during transmission are difficult to solve

Method used

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  • A Satellite Overlay Communication Method Oriented to Safety Communication Requirements
  • A Satellite Overlay Communication Method Oriented to Safety Communication Requirements
  • A Satellite Overlay Communication Method Oriented to Safety Communication Requirements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Simulation sampling rate fs=320kHz, short burst data packet length 600bit, symbol rate of cover signal and communication signal are both R B =32kBaud, both adopt QPSK modulation, the shaping filter roll-off coefficient is 0.25, use the carrier modulation of the same frequency fc=100kHz, the power difference is 3dB, wherein WFRFT conceals the transformation order α=1 of the signal, superimpose two signals and pass through Uncoded AWGN channel transmission.

[0073] Verify the anti-modulation recognition performance of the masked signal after introducing WFRFT. Digitally modulated signals can be uniquely described by a specific constellation diagram, and the constellation diagram constructed by a clustering algorithm can be used for modulation identification. In order to reflect the change of the constellation diagram before and after the introduction of WFRFT for signal concealment technology, the superimposed signal constellation diagram after transmission through the ...

Embodiment 2

[0075] Verify the effect of low power difference on non-cooperative parties demodulating WFRFT signals. Two scenarios are simulated: a single SPWFRFT signal, a superimposed SPWFRFT signal, and a conventionally modulated QPSK signal with 3dB lower power. The transformation order of the two signals is scanned in [-2, 2] at the interval of 0.01 and 0.02, and the SPWFRFT signal is inversely transformed and demodulated using the scanned value, and the bit error rate curve is obtained as Figure 4 shown. It can be seen that full-cycle scanning can realize the demodulation of single-channel SPWFRFT signals, but the full-cycle scanning method basically fails in the case of dual-channel.

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Abstract

The invention discloses a satellite overlapping communication method oriented to safety communication requirements, which is used to solve the safety communication problem of a portable satellite communication terminal. First, the transmitting terminal and the receiving gateway station preset a masking information sequence, and then undergo WFRFT transformation and shaping filtering to form a Mask the baseband waveform of the signal; then the transmitting terminal uses MPSK to modulate useful information to generate a communication signal, superimpose with the masked signal, up-convert it to the satellite orbit, and send it to the gateway station; the receiving gateway station uses the preset signal copy to reproduce the masked signal waveform , use the recurring waveform to cancel the self-interference to obtain the communication signal; this method uses the masked signal to reduce the signal-to-interference-noise ratio of the communication signal, and introduces the WFRFT transform to improve the difficulty of the non-cooperating party to eliminate the interference of the masked signal, compared with the conventional modulation method The satellite overlapping communication method further improves the security of signal transmission.

Description

technical field [0001] The invention relates to the technical field of satellite communication, and mainly relates to a satellite overlapping communication method oriented to safety communication requirements. Background technique [0002] Satellite communication has the characteristics of globalization, all-weather, and high reliability, making it an important means of communication. Due to the openness of the channel, the security of satellite communication needs special attention. Driven by the continuous improvement of satellite technology and communication technology, emerging technologies such as signal masking and weighted-type Fractional Fourier Transform (WFRFT) have emerged. Compared with traditional spread spectrum and other technologies, these technologies can Better protect the security of satellite signals. [0003] Signal masking technology is designed to transmit high-power masking signals and communication signals at the same frequency at the same time, us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04K1/02H04B7/185
CPCH04K1/02H04B7/18513Y02D30/70
Inventor 刘子威桑之昂丁晓进张更新李加洪
Owner NANJING UNIV OF POSTS & TELECOMM