The angle error equations derived to this point have reflected only the error performance due to thermal noise effects. However, angle-of-arrival performance can be affected by various sources of error other than thermal noise. In this chapter, we focus on errors that affect angle accuracy as opposed to angle precision. Because an interferometer determines angle-of-arrival from the output of phase or voltage from two antennas, the sensitivity of angle measurement to errors can be significant.

Chapter Contents:

• 9.1 Specular Multipath
• 9.1.1 Multipath Mitigation Using the Orthogonal Interferometer
• 9.1.2 Multipath Mitigation Using Sparse Arrays
• 9.1.3 Quantification of Multipath Using Interferometry
• 9.2 Angle Glint
• 9.3 ADC Timing Jitter
• 9.4 I and Q Imbalances
• 9.5 Quantization Effects
• 9.5.1 Phase Shifter Quantization Error
• 9.5.2 ADC Phase Quantization Error
• 9.6 Wideband Effects
• 9.6.1 Antenna Dispersion Loss
• 9.6.2 Channel Transfer Function Mismatch
• 9.7 Error Summary
• References

Inspec keywords: radar antennas; measurement errors; angular measurement; radar interferometry; thermal noise; direction-of-arrival estimation

Other keywords: radar interferometer; measurement error; thermal noise effect; antenna; interferometer angle-of-arrival error effect; angle measurement

Subjects: Single antennas; Spatial variables measurement; Radar equipment, systems and applications; Other topics in statistics; Signal processing and detection