Accession Number : ADA194476

Title :   Effect of Phase Errors in Stepped-Frequency Radar Systems.

Descriptive Note : Final rept. Jan 87-Jan 88,

Corporate Author : NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Personal Author(s) : VanBrundt, H E

PDF Url : ADA194476

Report Date : Apr 1988

Pagination or Media Count : 12

Abstract : Stepped-frequency waveforms are being considered for inverse synthetic aperture radar (ISAR) imaging from ship and airborne platforms and for detailed radar cross section (RCS) measurements of ships and aircraft. These waveforms make it possible to achieve resolutions of 1.0 foot by using existing radar designs and processing technology. One problem not yet fully resolved in using stepped-frequency waveform for ISAR imaging is the deterioration in signal level caused by random frequency error. Random frequency error of the stepped-frequency source results in reduced peak responses and increased null responses. The resulting reduced signal-to-noise ratio is range dependent. Two of the major concerns addressed in this report are radar range limitations for ISAR and the error in calibration for RCS measurements caused by differences in range between a passive reflector used for an RCS reference and the target to be measured. In addressing these concerns, NOSC developed an analysis to assess the tolerable frequency error in terms of resulting power loss in signal power and signal-to-phase noise.

Descriptors :   *RADAR CROSS SECTIONS, *SIGNAL TO NOISE RATIO, *SYNTHETIC APERTURE RADAR, AIRCRAFT, CALIBRATION, ERRORS, FLYING PLATFORMS, FREQUENCY, INVERSION, LOSSES, NULLS(AMPLITUDE), PASSIVE SYSTEMS, PEAK VALUES, PHASE, POWER, PROCESSING, RADAR, RANGE(DISTANCE), REDUCTION, REFLECTORS, RESPONSE, SIGNALS, TOLERANCE

Subject Categories : Active & Passive Radar Detection & Equipment
      Cybernetics

Distribution Statement : APPROVED FOR PUBLIC RELEASE