When UAVSAR works in the spotlight mode, the targets of P3 and P7 had a maximum expansion of 4.28% in range and 6.67% in azimuth.
The transmitter with GEOSAR on the small inclination is confirmed as a quiescent state, and UAVSAR offers all Doppler information.
Caption: Figure 1: Geometrical configuration of GEO-UAV BiSAR (UAVSAR works in the TOPS mode).
Parameter Value GEOSAR altitude 36,000 km Wavelength 0.03 m (X-band) Bandwidth 80 MHz Pulse duration 20 [micro]s UAVSAR altitude 8000 m Antenna size of UAVSAR 2m UAVSAR velocity 200 m/s Azimuth aperture angle in the case 12[degrees] of the receiver's spotlight mode The beam velocity of UAVSAR in 140 m/s the sliding spotlight mode The beam velocity of UAVSAR in 270 m/s the TOPS mode Table 3: Imaging qualities of the multipoint targets (P1, P5, and P9).
The RF transceiver of UAVSAR system has been tested in laboratory and outdoor environment.
Flight measurements have been successfully conducted end of 2010 at Mersing, Malaysia with primary objective is to verify the capability of UAVSAR system.
In this research project, receiver C-band RF transceiver for UAVSAR have been successfully designed and constructed.
In late 2008, a new UAVSAR project was initiated at Multimedia University (MMU), Malaysia, in collaboration with Agency Remote Sensing of Malaysia (ARSM).
This paper presents the system design and development, as well as some preliminary results of the UAVSAR. Section 2 outlines the major design issues and considerations for UAVSAR.
The center frequency of the UAVSAR is selected at 5.3 GHz, which is within the allowable spectrum (5250-5460 MHz) defined by International Telecommunication Union (ITU) for Earth Exploration Satellite System (EESS) .
Based on the design considerations described above, the specifications of the UAVSAR system are determined and are summarized in Table 1.
Figure 3 shows the functional block diagram of the UAVSAR Sensor.