Abstract
P-band ultra-wideband bistatic synthetic aperture radar (UWB BSAR) has the well capability of the foliage penetrating, high-resolution imaging and adding the scattered information, which is potential of detecting the concealed target. However, the P-band UWB BSAR raw data is of the huge amount, big spatial-variance, significant range azimuth coupling and complicated motion error, which increases the difficulty of the efficient and precise reconstruction. In this paper, we propose a reconstruction strategy for the P-band UWB BSAR raw data including the motion errors, which can solve the above problems with the high-efficiency and high-precision. This method requires the local beamforming from the raw data as an intermediate processing in the slant range plane instead of ground plane, which can be exactly referenced to the tracks of the transmitter and receiver considering platform altitudes. And, it derives the requirement for selecting the subapertures and subimages by analyzing the bistatic range error considering the motion errors, as well as sampling requirement of the beam for the subimages, which offers a near-optimum tradeoff between the precision and efficiency. Simulated and measured results show that the proposed strategy is effective, and can achieve the near optimal performance with the low computational complexity.
Highlights
With the rapid development of the remote sensing techniques [1]–[7], the huge amount of the remote sensing data has been acquired from the sensor platforms such as the satellites and aircrafts [8], [9], complemented by the surface and subsurface measurements and mapping [10], [11]
On the basis of the previous researches, we present a high-efficiency and high-precision reconstruction strategy for the P-band UWB Bistatic SAR (BSAR) raw data including the motion errors, which is based on the subaperture processing and local beamforming [43], [48]
The receiver ideal track is parallel to the Y axis, and the angle between the ideal track of the transmitter and the X axis is about 33.69◦
Summary
With the rapid development of the remote sensing techniques [1]–[7], the huge amount of the remote sensing data has been acquired from the sensor platforms such as the satellites and aircrafts [8], [9], complemented by the surface and subsurface measurements and mapping [10], [11]. Authors of [46] developed another bistatic FFBP method for the raw data reconstruction for the UWB BSAR system with a linear track, which was based on the subaperture processing and local beamforming [48] It only provided the requirement for selecting the subapertures and subimages, but didn’t offer the sampling requirements of the beams for corresponding subimages. Compared with [48], in the presented method, the motion errors of the radar platforms are considered in the deviation of the requirement for selecting the subaperture and subimage and sampling requirement of the beam for the subimages, which can give a near-optimum tradeoff between the phase error and computational complexity in the P-band UWB BSAR raw data reconstruction. ΣP is the coefficient of the scatterer P, prc [·] is the rangecompressed envelope, B is the bandwidth, τ is the fast time, c is the light speed, and fc is the carried frequency
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
