Year: 2026
Type: article
Abstract: Compared with conventional monostatic radar systems, space-air bistatic frequency diverse array (FDA) radar exhibits superior anti-jamming capability and enhanced early-warning performance for weak and maneuvering targets. However, the complex bistatic configuration and the high velocity of spaceborne platforms introduce several challenges, including range migration (RM), Doppler spread (DS), and Doppler frequency migration (DFM). In particular, frequency offsets among FDA array elements exacerbate inter-channel Doppler mismatches, significantly reducing the coherent integration gain and consequently degrading detection performance. To address these issues, this article establishes a target echo model within a three-dimensional coordinate framework and provides an analysis of the different order terms. Subsequently, the SOKT is implemented to eliminate first- and second-order range migrations as well as the coupling induced by velocity ambiguity. Thereafter, the MDF is employed in the slow-time domain to compress Doppler spread and restore coherent gain. Simulation results verify that the SOKT-MDF approach effectively mitigates the effects of target velocity and acceleration, alleviates the Doppler spread (DS) problem, and significantly improves detection performance while maintaining low computational complexity.
Source: Applied Sciences
DOI: 10.3390/app16031627
Authors: Jiale Liang, Weiwei Wang, He Wen, Chongdi Duan, Wanzhao Cui
Institution: China Academy of Space Technology
Language: English
Subfield: Aerospace Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,896
Award: G2361805260
OpenAlex ID: W7127897259
FWCI:
Cites:
Cited by:
Related to: