Image formation algorithm for missile borne MMW SAR with phase coded waveform

Abstract

The feasibility of the application with phase coded waveform to missile borne Millimetre Wave (MMW) Synthetic Aperture Radar (SAR) system was investigated. Based on theory analysis, the geometry model was simplified, the expression of the equivalent range and the Range-Doppler image formation algorithm were deduced simultaneously. The phase coded waveform is pulse compression signal, and it can depress the peak value power and provide large bandwidth, so the phase coded waveform is usually employed in SAR systems in order to acquire the low probability of intercept. The image results concentrated on the point array target and the area scene. Simulated results demonstrate that the SAR system with phase coded waveform has the ability to get the image of the target, and hence, the results validate the effectiveness of the image processing method.

Complete Complementary Sequence Coding Waveform Based Azimuth Multi-Channel Space-Borne Sar With Ultra-Low Range Sidelobe Ratio Performance

“…Further, as shown in [10], the inversion of H(f t ) yields a filter matrix G(f t ) [14,23], given by (12).…”

“…However, such nonlinear methods additionally introduce radiometric artifacts into SAR images [9]. As another solution, phase coding sequences were employed as radar waveforms to reduce range sideloberatio (RSLR) [10]. In order to assess performance of phase coding sequences based SAR system, auto-correlation function (ACF) of radar waveform, referred to as SAR impulse response function was investigated.…”

A Total Quality Assessment Solution for Synthetic Aperture Radar NLFM Waveform Generation and Evaluation in a Complex Random Media

“…In [14], the NLFM is designed based on piecewise linear (PWL) functions as a method of instantaneous frequency function to generate the NLFM while no quality analysis is done for the NLFM design procedure per se. The radar ambiguity function (AF) provides an indication of the limitations and utility of different waveforms while assess the properties of the transmitted waveform regarding to its target resolution, measurement accuracy, ambiguity and responses to the backscattering [12,15,19]. The AF is probably the most complete quality assessment statement of the waveform's inherent performance.…”

Signals with zero autocorrelation zone for the synthesised aperture radar

“…The wellknown SARs, for instance, for remote sensing of the Earth, use pulses with the linear-frequency modulation [1][2][3][4] as the probing radar signals. Nevertheless, we should note the increasing interest of radar experts to signals with phase-coded shift-keying (PCSK) [5][6][7]. This is related to the fact that utilisation in SAR of discrete value coding of the coherent ensemble of probing pulses opens a prospect of essential improvement of the radar image quality according to the parameters related to the properties of the total correlation functions of an ensemble.…”

“…where i, j and i ′ , j ′ are numbers of paired CSs defined by (6); i ′ is a number of CSs adjacent to CSs with number i, and j ′ is a number of CSs adjacent to CSs with number j. We call the coherent complementary signal (CCS) for the PCSK signal (2) coded by lines of the A 2,N matrix from (7).…”