Ultra Wideband Signal Synthesis
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To avoid the disadvantages of time domain-based generation of UWB signals such as low antenna radiation efficiency, inaccurate control of the signal spectrum, pulse shape and repetition interval, bandwidth synthesis and expansion in the frequency domain is proposed in this paper. Techniques including convolution, superposition, modulation and multiplication are used to synthesise and expand ultra wideband signal bandwidths beyond the traditional methods. It is shown that convolution and addition of signal spectra leads to expanded UWB bandwidth by orders of more than 4.5 times. Characteristics of functions which lead to bandwidth expansion are highlighted and discussed. Two UWB signals, Hermite and wavelet functions are used. It is shown that wavelets families are more suitable for bandwidth expansion
●Synthesis of ultra-wideband (UWB) linear frequency modulation radar signals is a very important technology for microwave imaging, target identification and detection of low radar-cross-section (RCS) targets. A new method of UWB radar signals generation with two-channel signal generator is presented.
●The realization structure is given; the principle and errors of signal synthesis are analyzed. At the same time, an automatic adjustment measure of signal phase is proposed because of phase discontinuity of waveform in this method.
●The simulation experiment and analysis results indicate that radar signals with large instantaneous bandwidth can be generated by means of this method on the condition that the high-speed digital devices are limited.