Signal Processing Issues for the Exploitation of Pulse-to-Pulse Encoding SAR Transponders

Abstract

Abstract-Synthetic aperture radar signal processing issues related to the exploitation of a pulse-to-pulse encoding transponder using pseudorandom codes discussed analytically. Namely the focusing algorithm, the code synchronization procedure and the properties of the code induced gain against non-encoding point scatterers and distributed ones. A time-domain processing algorithm and a code synchronization procedure are proposed and validated on simulated data and on a European Remote Sensing Satellite-2 data set containing prototypes of such a device. The interaction of the transponder signal with terrain backscattering is analyzed by deriving parameters that are useful for performance assessment. These are related to the relevant parameters in radiometric calibration, interferometric applications, and tagging.

An Internal Calibration Scheme for Polarimetric Synthetic Aperture Radar System

“…This paper uses the principle of UTE [3] to develop an internal calibration method to separate signal from individual TRM from the composite signal. The proposed OPC method uses that bit of TRM phase shifter representing 180 • phase change as encoder.…”

“…, t N ]. In this paper, we use Hadamard matrices for encoding as they provide the minimum estimation uncertainty [3]. The calibration signal injected into the H-channel of each TRM from power splitter X A is denoted by s(t).…”

Calibration of Wideband LFM Radars Based on Sliding Window Algorithm

“…Therefore, the beamforming system requires precise control of the transmitted or received signal to have desired differences in time, amplitude, phase in all frequencies. To achieve this, many calibration methods have been proposed and implemented [8][9][10][11][12][13][14]. The PN gating method is a widely used technique for the calibration of the remote sensing radar system, which is based on the orthogonal code [15][16][17].…”