Microwave staring correlated imaging method based on random frequency modulation with different rates

Abstract

In order to enhance the temporal-spatial stochastic characteristics of stochastic radiation fields, a new microwave staring correlated imaging method based on random linear frequency modulation with different rates is proposed, where microwave pulse signals emitted by different elements of stochastic radiation radar array have the same pulse periods and repetition frequencies, however, each pulse contains multiple sub-pulses of random linear frequency modulation (LFM) with different rates. Firstly, the imaging model is established, the process of stochastic radiation fields is investigated in detail, meanwhile its temporal-spatial stochastic characteristics is analyzed; Numerical simulations demonstrate that compared with conventional method of random LFM with the same sub-pulse rates, the proposed method can produce better temporal-spatial stochastic characteristics of radiation fields, thus a better microwave imaging can be achieved at lower sub-pulse rates and lower speed sampling of scattered echoes in the case of limited system bandwidth, which can reduce the cost and complexity of imaging system.