Abstract
It is aimed at the problem of forward-looking SAR micro-motion target detection in this paper. The traditional dual-channel SAR DPCA cancellation principle is analyzed and a dual-channel DPCA model of forward-looking SAR is proposed, the amplitude and phase characters of the signal after DPCA cancellation is studied, the distance domain of the micro-motion target is determined, then the micro-motion target detection is probability under different echo SNR with Monte-Carlo Operation, when the echo SNR is bigger than -5dB,and the target detection probability is greater than 90%.
Highlights
The dual-channel SAR ground moving target detection algorithm include: Space Time Sdaptive Processing (STAP) technique[1]-[3], Along Track Interferometry (ATI)[4]-[5], displaced phase center antenna (DPCA) clutter cancellation[6]etc..The traditional dual-channel side-looking SAR target detection system require two sub channels,it increases the complexity of radar front-end, because of the special geometric structure of forward-looking SAR,the dual-channel mode could be simple realized through changing the antenna transmit and receiving order on the premise of not increasing the hardware resources
Because of the simple principle, DPCA clutters reject is widely used in SAR moving target detection system.The stationary target echo phase of different apertures is consistent but the moving target echo phase is inconsistent, so the stationary target is preserved after clutter cancellation, the clutter cancellation formula could be expressed as: DPCA(t) = s1(t) − s2 (t)
Where γ mω is instantaneous line speed which is caused by the target micro-motion angular velocity,for the formula (19), the motion parameters of micro-motion target studied in this paper can be met.By the formula (17), after DPCA clutter cancellation the amplitude conversion of micro-motion target forward looking SAR echo signal may be represented as a sinusoidal function formed of ( Asin(ωt + φ) ),where the value of A is affected by the target micro-motion amplitude and frequency
Summary
The dual-channel SAR ground moving target detection algorithm include: Space Time Sdaptive Processing (STAP) technique[1]-[3], Along Track Interferometry (ATI)[4]-[5], displaced phase center antenna (DPCA) clutter cancellation[6]etc..The traditional dual-channel side-looking SAR target detection system require two sub channels,it increases the complexity of radar front-end, because of the special geometric structure of forward-looking SAR,the dual-channel mode could be simple realized through changing the antenna transmit and receiving order on the premise of not increasing the hardware resources. The dual-channel DPCA micro-motion dection method is worthy of study in the forward-looking SAR system
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