Signal modulation and demodulation methods, and phase hopping modulation and demodulation units

Abstract

The invention discloses signal modulation and demodulation methods and phase hopping modulation and demodulation units. The signal modulation method comprises the steps of 1, generating a phase hopping sequence via a phase hopping sequence generator under the control of a clock reference; and 2, performing corresponding phase shifting on the waveform of each chip in a signal to be modulated underthe control of the phase hopping sequence to acquire a modulated signal, wherein the phase hopping modulation unit comprises a phase shifter and a phase hopping sequence generator; the input end of the phase hopping sequence generator is used for being connected with the clock reference, and used for generating the phase hopping sequence under the control of the clock reference; the input end of the phase shifter is used for receiving the signal to be modulated; the control end of the phase shifter is connected with the output end of the phase hopping sequence generator; and after the phase shifter performs corresponding phase shifting on the waveform of each chip in the signal to be modulated under the control of the phase hopping sequence, the output end of the phase shifter outputs themodulated signal. According to the modulation method provided by the invention, the signal is equivalently subjected to twice PSK modulations, so that the modulated signal is close to noise characteristics, 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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