Wideband Signal Synthesis Method Based on Multiple Transmit Multiple Receive Frequency Division Radar

Abstract

The present invention provides a broadband signal synthesis method based on multi-transmission and multi-reception frequency division radar, comprising the following steps: 1) at the transmission end of the multi-transmission and multi-reception radar, synchronously transmit M subband signals from M transmitting array elements of the transmitting array; 2) At the receiving end of the multi-transmit and multi-receive radar, N receiving array elements in the receiving array receive echo signals, and each receiving array element is provided with M receiving channels to obtain N×M receiving signals corresponding to different frequency bands and different array elements; 3) Perform beamforming processing and matched filtering processing to obtain M narrowband signals, and then add the spectra of the M narrowband signals to obtain a composite broadband signal, and multiply the composite broadband signal by the reciprocal spectral window to obtain the final broadband signal. The present invention effectively overcomes the problem of side lobes generated when a plurality of narrowbands are synthesized into wideband signals. Therefore, the present invention can use a plurality of narrowband transceiving channels to realize high-resolution range images, thereby greatly reducing the performance requirements of imaging radars for wideband devices.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular, the invention relates to a method for synthesizing wideband signals based on narrowband signals of frequency division wideband radars of multiple-transmit and multiple-receive systems. Background technique [0002] With the development of radar technology, the resolution of modern radar systems is getting higher and higher, such as synthetic aperture radar (SAR) and inverse synthetic aperture radar (ISAR), which can obtain a distance resolution of less than the order of meters, and use Doppler Frequency analysis yields a two-dimensional image of the scene or object. The key to improving the resolution is to realize the receiving / sending of wideband radar signals. The core contradiction to be solved in realizing the wideband radar system is the contradiction between the requirement of high resolution for signal bandwidth and the limitation of performance / cost of transceiver devices ...

AI Technical Summary

Problems solved by technology

The main lobe of the pulse pressure waveform of the sub-band signal is wide, while the main lobe of each pulse of the periodic pulse sequence is narrow. High sidelobes near the main lobe of the signal pulse waveform

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