Multiple carrier-frequency digital frequency source

Abstract

This invention discloses a multi-carrier frequency digital frequency source including a computer interface circuit, a clock and drive circuit, a field programmable gate array FPGA unit, a direct digital synthesizing DDS sub-system, in which, said clock and drive circuit provides clock signals with strong driving ability to FPGA and DDS units in the system, said FPGA unit controls multiple same DDS sub-systems, each of which forms an independent channel output to generate different signal kinds, signals of different modulations, different frequencies and phases according to the time sequence sent by the FPGA unit and generates echo analog signals by simulating actual signals, especially the LFMICW signals.

Description

technical field [0001] The invention belongs to the technical field of electronic information and relates to digital frequency synthesis, in particular to a multi-carrier frequency digital frequency source, which can be used in the occasions where multiple synchronous intermediate frequency signal sources are required to be provided simultaneously in the fields of radar and communication. Background technique [0002] For the design of digital frequency source, the following methods are usually adopted: [0003] 1. Design of low-noise and high-resolution direct digital frequency synthesizer, such as "Wideband Radar Signal Generation Technology, edited by Fei Yuanchun, Beijing, National Defense Industry Press, 2002.1". This method is composed of numerical control oscillator, level converter, digital-to-analog D / A converter, low-pass filter and single-chip control circuit, etc., which can achieve good spectrum performance. However, this method has too many separated component...

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Problems solved by technology

This method has good scalability and is suitable for the application of simulators, but this method is too narrow to be used as a general frequency source

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