Digital down-converting system for implementing frequency-agility metrewave radar

Abstract

The invention discloses a digital down-converting system for implementing a frequency-agility metrewave radar. The digital down-converting system comprises a DDC (direct digital control) module, an NOC (numerical controlled oscillator) module, an A/D (analog/digital) sampling module, a frequency mixing module and a filtering module; the DDC module outputs working frequency points of a radar system to the NCO module and controls time sequence of the entire DDC module, the A/D sampling module quantizes radar echo signals, frequency mixing with local oscillating signals output by the NCO module to acquire zero intermediate frequency IQ two-way signals, and finally the filtering module filters to output the satisfactory zero intermediate frequency IQ two-way signals. Compared with the prior art, the digital down-converting system has the advantages that the working frequency points of the frequency-agility metrewave radar are limited and discontinuous, an implementation different with an original NCO module is adopted, resource consumption of an FPGA (field programmable gate array) is reduced, the local oscillating signals higher in frequency resolution can be acquired as well, a digital down-converting function of the frequency-agility metrewave radar is well achieved, and the high-quality local oscillating signals are required for frequency agility.

Description

technical field [0001] The invention relates to the application of the meter wave band in the field of radar, in particular to a digital down-conversion system for realizing frequency-agile meter wave radar. Background technique [0002] VHF radar is also called meter-wave radar. Its advantages are simple manufacturing technology and long detection distance, but it also has disadvantages such as poor measurement accuracy and bulky volume. Therefore, since the 1970s, most countries in the world have eliminated meter wave radars. However, in recent years, with the extensive application of stealth technology and the continuous development of new radar technology, the advantages of meter wave radar in detecting stealth flying targets and countering anti-radiation missiles (ARM) have once again attracted the attention of the radar community. All countries in the world put the development of meter wave radar in the important position of radar detection system. [0003] However, ...

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Problems solved by technology

[0014] Based on the above-mentioned deficiencies existing in the prior art, the present invention now proposes a digital down-conversion system and corresponding method for realizing frequency-agile meter-wave radar,

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