Frequency-Domain Identification and Model-Order Selection for Efficiently Simulating Microwave Radiometers

Based on frequency-domain system-identification techniques combined with an optimal model-order selection, this modeling method efficiently simulates microwave radiometers. A broadband microwave receiver (with astronomical applications) is modeled and simulated to illustrate the technique. This particular receiver is a challenging case because it samples cosmic microwave background (CMB) low-power broadband (10-gigahertz) signals over a long period.This work is supported by the Spanish Science and Innovation Ministry. Francisco Javier Casas received support from grants AYA2010-21766-C03-01, Consolider- Ingenio 2010 CSD2010-00064, and the program Personal Técnico de Apoyo (Support-Technician Personnel). Juan Pablo Pascual received support from grants Consolider-Ingenio 2010 CSD2008- 00068 and TEC2008-06874-C03-01. Joaquín Portilla is grateful to the Basque government for its support through project IT456-10.Peer Reviewe