基于时间-距离-多普勒像的编队目标架次检测

针对实际编队目标在距离上的分布特性和目标多普勒频率的变化规律，利用联合时频变换代替传统傅立叶变换，建立目标时间-距离-多普勒立体像，提出一种基于立体像的目标架次检测方法。该方法不仅能给出清晰的瞬时距离-多普勒像，而且能反映目标距离-多普勒像的时间演变特性，较好地解决了目标在距离上的分布和多普勒像的模糊。实测回波数据验证了该方法的有效性，成功地实现了4架编队飞机目标的架次检测。

Target Number Detection Based on Time-Range-Doppler Image

As the targets flying in groups may spread over several range of cells and their Doppler frequencies are time*.varying, a scheme of target number detection in groups on a conventional low*.resolution radar is proposed based on a time*.range*.Doppler image cube which is constructed by substituting a time*.frequency transform for the Fourier transform in the conventional range*.Doppler imaging. The image cube provides not only a clear range*.Doppler image with superior resolution at each time instant but also the time*.varying history of the images, hence we obtain a good solution to the problem of range spread and image blurring. The experimental results of actual target echoes demonstrate the validity of the scheme with successful detection of four targets flying in groups.