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SAR simulation for forest application has been proved as an effective tool to provide scattering models and simulated SAR data for the research of forest retrieval algorithms. The common method of SAR simulation is combining the scattering coefficients with the ideal Point Spread Function to generate images directly without echo generation. However, when there are non-ideal factors in remote sensing...
The key problem of the imaging processing in geosynchronous earth orbit (GEO) SAR system is the space-variance of the Doppler parameters, which will result in the defocus of the SAR image with classical imaging algorithm. In this paper, a Modified Range Migration Algorithm (RMA) is proposed to overcome the space-variance of Doppler parameters by compensating the velocity change along the location...
Code and voltage dependence of the finite output impedance is a major contributor to current-steering DACs' nonlinearity. This paper introduces a novel output impedance linearization technique that very effectively reduces this code and voltage dependence. The linearization is achieved by using a small linearization DAC switched with control signals opposite to those for the main DAC. The area and...
The focusing performances of two-step algorithm are analyzed in the paper. The convolution processing in two-step algorithm is detailed analyzed. It can be found that the operation can reduce the Doppler bandwidth effectively and overcome the alias of azimuth echo by making the residual Doppler bandwidth smaller than PRF. The formula of residual Doppler bandwidth is derived here. According to the...
This paper is mainly focused on the errors leaded by improper use of approximate antenna pattern formula and common errors in phased array radar antenna pattern simulation. First, the formula of linear and planar phased array antenna pattern is derived. Then, the precise definition of argument is presented and some precise and approximate expressions of antenna pattern are listed. Finally, simulation...
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