Wide-frequency band complex-type frequency agility signal generation system based on baseband frequency mixing

Abstract

The present invention discloses a wide-frequency band complex-type frequency agility signal generation system based on baseband frequency mixing. The system comprises a baseband agility unit, a frequency mixing agility unit, an agility local oscillation unit and a universal platform unit. The baseband agility unit is connected to the frequency mixing agility unit. The frequency mixing agility unitis connected to the agility local oscillation unit. The baseband agility unit, the frequency mixing agility unit and the agility local oscillation unit are all connected to the universal platform unit. According to the wide-frequency band complex-type frequency agility signal generation system, a mechanism of programmable baseband agility and multi-state frequency mixing agility is used, and a broadband complex modulation type frequency agility electromagnetic signal in a signal simulation frequency band is generated. Because a frequency mixing manner is used, signal straying can be reduced fundamentally, and signal quality is improved. A multi-stage frequency mixing agility manner is used, a straying deterioration situation is obviously reduced, and signal frequency agility in a frequency range from 10 MHz to 40 GHz can be implemented.

Description

technical field [0001] The invention relates to the field of frequency-agility, in particular to a system for generating frequency-agile signals in a wide-band complex pattern based on baseband mixing. Background technique [0002] Frequency-agile electromagnetic signal generation technology is one of the key technologies in the technical fields of frequency-agile radar, electronic countermeasures, and complex electromagnetic environment simulation. The purpose is to achieve fast and controllable jumping of electromagnetic signal frequency. At present, the fastest frequency switching time in the frequency range from 10MHz to 40GHz can reach an index of less than 100ns, that is, the number of frequency switching per second can reach several million times. In the previous process of frequency-agile signal generation, the main focus was on the switching speed of the signal frequency, and less consideration was given to factors such as signal style and bandwidth. Therefore, DD...

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Problems solved by technology

[0004] Due to the spectrum stretching in the frequency doubling process of the existing frequency-agile signal generation methods, the occurrence of complex modulation pattern agile frequency signals cannot be guaranteed, and the signal spurious index deteriorates in multiples during the frequency doubling process, resulting in the occurrence of agility The quality of the frequency conversion signal is low, and it is highly dependent on the index of the direct digital frequency synthesis device. The present invention provides a wide-band complex-style frequency-agile signal generation system based on baseband mixing

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