ABSTRACT
Chapter 15 showed how radar-signal return sampling in each channel combined with selective analog and digital integration can provide an optimal signal-to-noise ratio (SNR) at all ranges. If the measured range cells in each channel have spatial shifts due to different time delays in each channel, then any image-processing system will produce a distorted image. High-quality radar imaging from a multielement array of transmitters and receivers such as the ones shown in Figure 16.1 requires all range cells to have a known relation, that is, a time base. We can ignore this problem for low-resolution radar systems with a single transmitter and receiver. For the type of precise real-time imaging with the Xaver™ series of radars discussed in Chapter 11, we require an exact time alignment of all range cells.
