Frequency synthesizer and method for receiving ultra-short wave and microwave frequency band wireless signals

Abstract

The invention discloses a frequency synthesizer for receiving ultra-short wave and microwave frequency band wireless signals. The frequency synthesizer comprises a frequency synthesizer body and a DDSunit. The DDS unit comprises a DDS chip, and the output end of the DDS chip is electrically connected with the input end of a phase accumulator through a wire. The invention relates to the technicalfield of frequency synthesizers and discloses a frequency synthesizer and a method for receiving ultra-short wave and microwave frequency band wireless signals. According to the invention, the frequency synthesizer designed by matching a field programmable gate array (FPGA) technology with a direct digital frequency synthesis (DDS) technology is adopted. The required frequency control word can bequickly obtained. The overall performance of the synthesizer is greatly improved. Pseudo-random numbers are generated through the FPGA main control module. The random frequency hopping of the frequency synthesizer can be accurately achieved. The frequency synthesizer has the advantages of being high in frequency conversion speed, high in frequency resolution, high in anti-jamming capability and the like. Meanwhile, the output frequency range of the frequency synthesizer is greatly widened, and the use requirements of actual users can be met.

Description

technical field [0001] The invention relates to the technical field of frequency synthesizers, in particular to a frequency synthesizer and a method for receiving ultrashort wave and microwave frequency band wireless signals. Background technique [0002] A frequency synthesizer is a device that uses one or more standard signals to generate a large number of discrete frequency signals through various technical approaches. Direct digital frequency synthesis (DDS) technology is the third generation of frequency synthesis technology developed rapidly with the development of digital integrated circuits and microelectronics technology after direct frequency synthesis and indirect frequency synthesis. It is based on digital signal processing theory , starting from the amplitude-phase relationship of the signal for frequency synthesis, with extremely high frequency resolution, extremely short frequency conversion time, wide relative bandwidth, continuous signal phase during frequen...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies in the prior art, the present invention provides a frequency synthesizer and method for receiving ultrashort wave and microwave frequency band wireless signals, which solves the problem of calculating multiple frequency control words in general DDS, resulting in increased frequency hopping time and inaccurate Realizing the random frequency hopping of the frequency synthesizer leads to the decrease of the overall operating speed of the synthesizer and the narrow frequency range and the problem that the signal is prone to interference

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