A modified range-Doppler algorithm (M-RDA) for high squint synthetic aperture radar (SAR) imaging is proposed in this letter. In the M-RDA, the range walk (RW) is removed firstly by multiplying a preprocessing function in range frequency-azimuth time domain, which is the dominant component of the totle range cell migration (RCM). There is no interpolation operation in the proposed M-RDA, which greatly improves its computational efficiency. To obtain a well-focused SAR image, the fourth-order phase error is considered to achieve accurate azimuthal compression. Finally, the effectiveness of the proposed algorithm is proved by the point target simulation results.

In this letter, the jamming resource allocation problem of distributed jammers cooperatively jamming netted radar system is investigated. A well-constructed jamming resource allocation model considering jamming beams, jamming power and other influencing factors is established. Random keys are used in this letter to improve the coding mode of genetic algorithm. Simulation results show that in the case of limited jamming resources, the model and algorithm proposed can achieve effective jamming allocation schemes facing a netted radar with any number of radar nodes.