Frequency hopping signal generator and frequency hopping method

Abstract

The invention discloses a frequency hopping signal generator and a frequency hopping method. The frequency hopping method includes: after a modulation type is determined, a phase modulation code for a phase adder is selected according to a configured phase control word to achieve phase modulation, and a modulation amplitude is selected according to a configured amplitude control word to achieve amplitude modulation; the phase adder enables a sum of an accumulated value obtained through accumulation of frequency control words and the phase modulation code to be used as a read address of a carrier memory; the carrier memory reads a carrier amplitude according to the read address to achieve phase-amplitude conversion; and the carrier amplitude and the modulation amplitude multiply and are sent to a digital to analog converter (DAC) to complete digital to analog conversion. The frequency hopping signal generator and the frequency hopping method can support various modulation types and are good in flexibility, and other modulation types can be added easily.

Description

technical field [0001] The invention relates to the technical field of frequency hopping communication, in particular to a frequency hopping signal generator and a frequency hopping method. Background technique [0002] Frequency hopping is one of the most commonly used spread spectrum methods. Frequency hopping communication is a communication method in which the carrier frequency of the transmission signal transmitted by the transmitting and receiving parties changes discretely according to a predetermined rule. Frequency hopping communication is mainly used for military radio communication and civil mobile communication, and its working mode is generally based on voice, and data can also be transmitted. With the continuous development of frequency hopping technology, its application is becoming more and more extensive. Frequency hopping communication equipment, such as frequency hopping radio stations and reconnaissance receivers, often use frequency hopping signal gener...

AI Technical Summary

Problems solved by technology

But its disadvantage is that it cannot provide modulation function and can only be used as a frequency hopping local oscillator source

[0011] The frequency hopping modulation system in this scheme has the following deficiencies: the implementation of modulation is relatively complicated; the frequency hopping is realized by modifying the internal register of AD9854, which causes the frequency switching time to be as long as tens of nanoseconds, which reduces the frequency hopping rate; The use of DSP modules to complete the frequency hopping code sequence generator greatly increases the software burden; AD9854, as a dedicated chip, has inflexibility in design, only supports sinusoidal carrier waves, and the modulation types are not rich enough, and it does not support common frequency hopping communications. QPSK Modulation

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