Ultra-wide-band multi-mode radar signal generation method and apparatus

Abstract

An ultra-wide-band multi-mode radar signal generation method used in modern imaging radars comprises the following main steps: 1) generating a single-narrowband digital intermediate frequency signal by a data signal source; 2) filtering out-of-band interference signals in the signal generated in step 1; 3) spreading spectrum and carrying out up conversion on the signal obtained in step 2; 4) collecting and analyzing the signal obtained in step 3 by using a general instrument; 5) evaluating whether the signal satisfies requirements according to the step 4, if the signal does not satisfy the requirements, carrying out predistortion to the digital signal source, returning to step 1 and circulating from the step 1 to the step 4 till the signal satisfies the requirements so as to complete the generation of the ultra wide band signal. The invention also provides an apparatus which is used to realize the above method. In the method of the invention, spread spectrum is adopted to obtain the ultra wide band radar signal under a low sampling clock; a plurality of work modules, which are a plurality of different bandwidths and pulse widths radar signals, can be completed. The invention plays an important role on raising radar imaging resolution and enhancing radar system flexibility.

Description

Technical field [0001] The invention belongs to the field of radar technology, and particularly relates to an ultra-wideband multi-mode radar signal generation method and device applied to modern imaging radars. Background technique [0002] Modern radar has not only completed the extraction of information such as target position and speed, but also required imaging analysis and recognition of the target. In the past ten years, the international research on high-resolution imaging radar has made breakthrough progress. The ultra-wideband airborne synthetic aperture radar PAMIR SAR system of Germany's High Frequency Physics and Radar Institute has a bandwidth of up to 1820MHz, and its resolution has reached the sub-centimeter order. The ultra-wideband ultra-high-resolution small airborne imaging radar system of the San Diego National Laboratory in the United States has a bandwidth of 3000MHz, a resolution of 0.05 meters, and a weight reduced to only 25 pounds (11.4kg). It is conc...

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Problems solved by technology

[0023] The image and carrier-drain components of the quadrature modulator bring corresponding spurious components due to frequency doubling as and These spurious components within the working bandwidth cannot be filtered out by the filter, which will seriously affect the spectral quality of the signal

[0024] From the above analysis, it can be seen that the signal quality generated by the traditional method combined with the design scheme of frequency multiplication will further deteriorate with the increase of frequency multiplication times, then the frequency multiplication times using this method will be greatly limited, so this method is not suitable for ultra-wideband radar signal generation

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