Another way to detect slow-moving tactical targets is by means of HRM coupled with some form of change detection between multiple images. The change detection methods are coherent change detection (CCD) and shadow detection, noncoherent change detection (NCD), video SAR, inverse SAR (ISAR) and synthetic monopulse. Each of these will be discussed but first an understanding of conventional SAR is required. Often, fast(er) moving targets and slow-moving targets and SAR maps are acquired by the same waveform as described at the end of Chapter 6. The separate target types are usually separated by filtering.

Chapter Contents:

• 7.1 SAR notions
• 7.2 Synthetic array geometry
• 7.3 Doppler histories of point scatterers
• 7.4 Doppler beam sharpening [2,3,4]
• 7.4.1 DBS signal processing
• 7.5 SAR mapping
• 7.6 Strip mapping
• 7.6.1 Line-by-line processing
• 7.6.2 Batch strip map [1]
• 7.7 Tracking telescope/spotlight SAR
• 7.8 DBS or SAR PRF, pulse length and compression selection
• 7.8.1 Ambiguities, grating and sidelobes
• 7.9 SAR imaging
• 7.9.1 Image quality measures
• 7.9.2 SAR resolution
• 7.9.3 SAR pulse compression
• 7.9.4 SAR signal processing
• 7.9.5 Signal-to-noise ratio
• 7.9.6 Contrast ratio
• 7.10 Motion compensation for mapping and STAP MTI
• 7.10.1 Motion-adaptive methods to reduce phase errors
• 7.10.2 Depth of focus
• 7.11 Autofocus
• 7.12 Image smoothing: multilook
• 7.12.1 Polar format
• 7.13 Slow-moving target indication by change detection
• 7.13.1 Non-coherent change detection
• 7.13.2 Coherent change detection
• 7.14 Video SAR and shadow detection MTI
• 7.15 Inverse SAR
• References

Inspec keywords: radar detection; synthetic aperture radar; military radar

Other keywords: shadow detection; CCD; inverse SAR; synthetic aperture radar; NCD; HRM; ISAR; synthetic monopulse radar; slow-moving tactical target detection; noncoherent change detection; video SAR; SAR maps; coherent change detection method

Subjects: Radar equipment, systems and applications; Signal detection