Transmitter and Receiver Design of an Experimental Airborne Synthetic Aperture Radar Sensor

Abstract

Abstract-An Experimental Airborne Synthetic Aperture Radar (SAR) Sensor has been designed and developed at Multimedia University, Malaysia. The airborne system is an inexpensive C-band, single polarization, linear-FM airborne radar sensor. An innovative cancellation network is implemented to overcome the poor isolation of the circulator thus allow a single antenna to be used for transmitting and receiving the radar signal. The system will be used for monitoring and management of earth resources such as paddy fields, oil palm plantation and soil surface. This paper highlights the design and development of the SAR transmitter and receiver, as well as the evaluation result of the sensor. Calibration has been performed in the laboratory to verify the performance of the radar sensor. External calibration is accomplished by using three artificial point targets, i.e., 12" conducting sphere, 4"×8" dihedral corner reflector and 8" trihedral corner reflector. The field measurements are conducted in an empty car park, which is a low reflection outdoor environment. Both range detection and radar cross section (RCS) measurement capability are verified in the field experiments.

Design and Development of a Dual Operating Mode Microstrip Patch Antenna for Unmanned Aerial Vehicle Synthetic Aperture Radar

“…Targeted band in the main lobe will be corrupted due to this aliasing signal and cause ambiguity. Azimuth ambiguity can be quantified by computing the ratio of total aliasing signal over the main beam signal, which is known as azimuth ambiguity over signal ratio (AASR) [4]. Typically, maximum AASR is set to −20 dB.…”

The Masar Project: Design and Development

“…The IF band-pass filter is designed to operate from 5 MHz to 45 MHz. A prototype RF transceiver has been developed, where both range detection and radar cross section (RCS) measurement capabilities are verified in the field experiments [13].…”

Circularly Polarized Microstrip Antennas with Proximity Coupled Feed for Circularly Polarized Synthetic Aperture Radar

“…The primary considerations in the design and subsequent fabrication processes are low cost, light weight and ease of manufacturing. One antenna aperture will be used for both transmitting and receiving CP-SAR signals, with a circulator to control the direction of signal flow into/out from the CP-SAR sensor circuit (Chan, 2004). The CP-SAR antenna consists of an array of single antenna elements, each being a microstrip antenna for circular polarization.…”