The micro-Doppler (m-D) effect describes the subtle micromotion features of a radar target and provides a new approach for feature extraction and auto radar target recognition. However, the microwave radar cannot provide enough resolution to detect the m-D effect of small targets and long distance targets. In order to obtain high range resolution for the extraction of subtle m-D signatures, inverse synthetic aperture imaging LADAR (ISAIL) is used here. Because the ISAIL uses a frequency modulation continuous wave signal, the m-D effect of ISAIL is different from the microwave radar. In this paper, the m-D effect of ISAIL is analyzed. The features of the m-D signatures in ISAIL are extracted by an improved Hough transform method associated with erosion and dilation operations in binary mathematical morphology. The simulations are given to validate the theoretical analyses and the proposed m-D extraction method. The experiment results show that the ISAIL can offer sufficient information of micromotions when the feature of motions is tiny.
With the widespread application of satellite navigation system, for aerospace vehicle guiding and navigation, the study
on application affect of satellite navigation system in aerospace is of great value to provide navigation services better and
satisfy the high accuracy navigation and guiding requirement of aerospace vehicle. This paper put emphasis on the
influence on satellite navigation system positioning performance caused by geometrical, dynamic, physical and
electromagnetic environment of aerospace. The work of this paper can provide a good idea and direction for subsequent
The function of Near Space Vehicle (NSV) in aerospace information system is analyzed in this paper firstly. Then the
architecture of area information confrontation system based on NSV is presented aiming at achieving superiority in area
information confrontation and the possible information confrontation mode is discussed. Finally the design of NSV
information confrontation simulation system is put forward. This paper is of guiding significance for the effective utilize
of near space as well as the development of NSV and its payload.