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Mixed spread spectrum system of bpsk signal and msk signal

A signal mixing and spread spectrum system technology, applied in transmission systems, digital transmission systems, modulated carrier systems, etc., can solve the hidden dangers of safety, cannot suppress the mutual interference of BPSK and MSK signals, etc., and achieve good suppression effects.

Active Publication Date: 2019-05-28
DFINE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When two different system signals (BPSK and MSK modulation) are sent to the same receiver for splicing and spreading, most of the existing receivers for receiving BPSK and MSK signals cannot suppress the mutual interference of BPSK and MSK signals , there is a great security risk

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  • Mixed spread spectrum system of bpsk signal and msk signal
  • Mixed spread spectrum system of bpsk signal and msk signal
  • Mixed spread spectrum system of bpsk signal and msk signal

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Embodiment Construction

[0011] BPSK signal and MSK signal mixed spread spectrum system, including signal acquisition unit, frequency mixing and filtering unit and FPGA chip, the signal acquisition unit collects 361Mhz~239Mhz broadband IF signal at a rate of 400M, and the collected broadband IF signal is mixed and filtered The unit obtains two orthogonal I / Q baseband signals of 20Mhz BPSK or 100Mhz MSK and sends them to the FPGA chip for digital signal processing, and the related software of anti-interleaving is sintered in the FPGA chip. The FPGA chip includes the BPSK correlation peak calculation unit and MSK Correlation peak calculation unit, BPSK correlation peak calculation unit includes BPSK correlator, amplitude calculation average unit and comparison unit; MSK correlation peak calculation unit includes MSK correlator, MSK local code phase calculation unit, amplitude calculation average unit and comparison unit, BPSK correlation The baseband frequency of the correlator is fbpsk=20Mhz, and the ch...

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Abstract

The invention discloses a BPSK (Binary Phase Shift Keying) signal and MSK (Minimum Shift Keying) signal hybrid spread spectrum system, and aims to solve the problem that a great potential safety hazard exists since a receiver for receiving a BPSK signal and an MSK signal cannot restrain mutual interference between the BPSK signal and the MSK signal. A signal acquiring unit acquires a broadband high and medium-frequency signal of 361Mhz to 239Mhz at a rate of 400M; acquired data are converted into an I / Q baseband signal with a code rate of 20Mhz or 100Mhz through a mixing and filtering unit, and the I / Q baseband signal is transmitted to an FPGA (Field Programmable Gate Array) chip; the FPGA chip dispreads the baseband signal by a BPSK correlator or an MSK correlator; meanwhile, a threshold signal is calculated on the basis of the I / Q baseband signal through an amplitude calculation average unit; outputs of the BPSK correlator or the MSK correlator and the amplitude calculation average unit are connected with a comparison unit; and the comparison unit is used for comparing the threshold signal with a relevant amplitude to output a correlation peak.

Description

Technical field: [0001] The present invention relates to hybrid spread spectrum receiving systems. Background technique: [0002] When two different system signals (BPSK and MSK modulation) are sent to the same receiver for splicing and spreading, most of the existing receivers for receiving BPSK and MSK signals cannot suppress the mutual interference of BPSK and MSK signals , there is a great security risk. Invention content: [0003] The purpose of the present invention is to provide a kind of BPSK signal and MSK signal hybrid spread spectrum system that can suppress the mutual interference of BPSK and MSK signal. [0004] The present invention is achieved like this: [0005] The mixed spread spectrum system of BPSK signal and MSK signal is characterized in that the signal acquisition unit collects 361Mhz-239Mhz broadband IF signals at a rate of 400M, and the collected broadband IF signals are passed through the frequency mixing and filtering unit to obtain 20Mhz BPSK ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/10H04B1/69H04B1/7097H04L27/227
CPCH04B1/10H04B1/69H04B1/7097H04L27/2273
Inventor 黄亮张敏谢宁川
Owner DFINE TECH