Abstract

In the simulation of SAR raw data, it is well-known that the frequency-domain algorithm is more efficient than a time-domain algorithm, making it is more suitable for extended scene simulation. However, the frequency-domain algorithm is perhaps better suited for ideal linear motion and requires some degrees of approximations to take the nonlinear motion effects. This chapter presents an efficient simulation approach based on hybrid time and frequency-domain algorithms under certain assumptions. The algorithm has high efficiency and is suitable for the simulation of extended scenes, which demands highly computational resources. The computational complexity of the proposed algorithm is analyzed, followed by numerical results to demonstrate the effectiveness and efficiency of the proposed approach.

Highlights

  • There are two major approaches to the synthetic aperture radar (SAR) raw echo data simulation: timedomain and frequency-domain methods

  • We present the fast echo simulation algorithm of trajectory offset and attitude jitter error

  • Where δ~rðx0, φdÞ is the track deviation caused by the deviation of radar track from the ideal track when the radar beam points to the center of the scene, which is only related to the azimuth position of radars and is the main component of track deviation, ψ~ðx0, r, φdÞ is the range to space variability of track deviation, and φ~ðx0, x, r, φdÞ accounts for the influence of radar platform position, azimuth and range variations

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Summary

Introduction

There are two major approaches to the SAR raw echo data simulation: timedomain and frequency-domain methods. The frequency-domain algorithm, based on the two-dimensional frequency-domain expression of the original echo signal, uses a fast FT to realize simulation [5, 6] This kind of algorithm delivers high efficiency to a high degree. The main idea of the existing methods is to realize the SAR raw data simulation in the frequency-domain with the high efficiency of the fast FT [7]. Reference [10] improved the traditional 2-D frequency-domain method and extended it to the squint mode These two algorithms only consider the case of the tracking error or the case of the squint mode and do not consider the case of the squint with the trajectory deviations. We consider the Fourier domain approach to account for trajectory deviations and antenna beam pointing errors, given rising more problematic for airborne SAR systems.

Raw echo algorithm of squint airborne strip SAR with trajectory offset error
Computational complexity of the algorithm
Algorithm simulation verification
Raw echo algorithm of airborne stripmap SAR with trajectory error and attitude jitter
Computational complexity
Algorithm verification
Simulation algorithm (32)
Simulation results
Conclusion

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