Radio frequency hopping signal generation method and device based on cyclic frequency shift

Abstract

The invention discloses a radio frequency hopping signal generation method based on cyclic frequency shift. The method comprises the following steps: dividing an optical signal with the frequency of fc into two paths; performing frequency shift on the first path of optical signal to obtain a reference optical signal; converting the second path of optical signal into a periodic optical pulse signalthrough an optical switch, inputting the optical pulse signal into a cyclic frequency shift module, and outputting an optical frequency hopping signal from the cyclic frequency shift module; and carrying out beat frequency on the optical frequency hopping signal and a reference optical signal to obtain a radio frequency hopping signal, and adjusting the center frequency of the radio frequency hopping signal by changing the frequency shift amount of the first path of optical signal. The invention also discloses a radio frequency hopping signal generation device based on cyclic frequency shift.According to the invention, the bandwidth range of the frequency hopping signal can be expanded, high-speed frequency hopping is realized, and the center frequency and the frequency hopping speed ofthe frequency hopping signal are controllable.

Description

technical field [0001] The invention relates to a method for generating a radio frequency frequency hopping signal, in particular to a method and device for generating a radio frequency frequency hopping signal realized by microwave photon technology. Background technique [0002] Frequency hopping signal is a spread spectrum method, which has good anti-jamming effect and plays an important role in communication, radar and electronic warfare systems. In communication systems, frequency hopping technology can improve communication capacity and anti-interference ability; in radar systems, the large time-bandwidth product (Time-Bandwidth Product, TBWP) of frequency hopping signals can increase detection distance and improve distance resolution. At present, the frequency hopping signal generated by the traditional electronic method is limited by the electronic bottleneck, the bandwidth is small (below GHz), and the speed is slow (kHz order of magnitude). With the development of...

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