A signal modulation and demodulation method and a phase-hopping modulation and demodulation unit

Abstract

The invention discloses a signal modulation and demodulation method and a phase-skipping modulation and demodulation unit, wherein the signal modulation method includes: (1) generating a phase-hopping sequence through a phase-hopping sequence generator under the control of a clock reference; (2) Under the control of the phase-hopping sequence, the waveform of each chip in the signal to be modulated is shifted correspondingly to obtain the modulated signal; the phase-hopping modulation unit includes: a phase shifter and a phase-hopping sequence generator, and the input of the phase-hopping sequence generator The terminal is used to connect to the clock reference, and is used to generate a phase-hopping sequence under the control of the clock reference; the input terminal of the phase shifter is used to receive the signal to be modulated, and the control terminal of the phase shifter is connected to the output terminal of the phase-hopping sequence generator. Under the control of the phase hopping sequence, the phase shifter performs corresponding phase shift on the waveform of each chip in the signal to be modulated, and then outputs the modulated signal from the output terminal. The invention is equivalent to performing secondary PSK modulation on the signal, so that the modulated signal is close to the noise characteristic, and the anti-detection performance of the signal can be improved.

Description

technical field [0001] The invention belongs to the technical field of signal modulation, and more specifically relates to a signal modulation and demodulation method and a phase-hopping modulation and demodulation unit. Background technique [0002] The confidentiality, reliability and anti-theft of key data such as aerospace telemetry, measurement and control, external measurement, and range experiments, as well as satellite navigation military signals, are crucial to national security. Enemy information detection will seriously threaten the launch and flight safety of various spacecraft. Therefore, the reliability requirements of wireless communication signals in special tasks and the importance of communication security make new wireless communication systems have to have good confidentiality capabilities. Modern wireless communication systems usually use frequency hopping and spread spectrum methods to resist interception and interference. With the improvement of inter...

AI Technical Summary

Problems solved by technology

These methods have problems such as large hardware overhead, difficult network planning, and poor real-time performance.

Although conventional frequency hopping technology, differential frequency hopping technology and adaptive frequency hopping technology can already resist most interception and jamming methods, their performance still cannot meet some special scenarios when fighting against the increasingly developed interception technology and jamming technology The needs of wireless communication

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