Multichannel Receiver Characterization for Adaptive Array Applications. Phase 4. Calibration Procedures/Tests

Multichannel Receiver Characterization for Adaptive Array Applications Phase 5: Experiments/DSP Software

“…The strong return from the calibrator is located near the road passing the Newport town barn. The elliptical band caused by the mainbeam multipath discussed in [9] is evident. The band appears more circular because the terrain map dimensions were distorted to fit the rectangular format of the radar display.…”

“…Table 3.2 presents the calibration data taken during the 1998 tests. The major differences from the 1997 data [9] are the 13.4 dB increase in gain and effective RCS of the calibrator, the use of a 3 pulse MTI in the processing and the number of pulses coherently integrated. The interfering ground clutter return from this area averages 11 dBsm with peak returns up to 20 dBsm.…”

“…The town barn site used in previous experiments [6][7][8][9] was chosen as the reference site. It offered no screening from vegetation and, except for a few houses, provided a clear reference site.…”

“…Consistent results were reported in past reports and this site was used to provide a check on the operation of the radar system and to provide a reference for other site measurements. The site is also near a road that allows a reference measurement of the vehicle used in the other screened measurements [9]. The display of the range-angle radar data on the xy coordinates requires a coordinate transformation.…”

“…The third task presented an assessment of the existing adaptive array receiver's utility for investigating clutter phenomenology and defined two experiments that demonstrate the capabilities of AFRL's adaptive receiver's capabilities [8]. The fourth task developed procedures for using the calibrated transponder in the radar cross section measurements of clutter and targets and demonstrated these procedures in the measurement of the local clutter environment [9].…”