Calculation of the radar ambiguity function from time-domain measurement data for real-time, amplifier-in-the-loop waveform optimization

Abstract

The ambiguity function is a measure of a radar's range and Doppler detection capability. Cognitive radar systems require the capability to adjust the waveform in realtime to obtain desired range/Doppler detection capability while meeting stringent spectral requirements. While the ambiguity function of the waveform input to the transmitter can be simulated, it is the ambiguity function of the transmitter power amplifier's output waveform that will be used for the detection. As such, it is very helpful to be able to measure the ambiguity function output from a power amplifier in the optimization process. This paper describes a technique that can be used to quickly calculate the ambiguity function for the output waveform from the radar amplifier as measured on an oscilloscope. Brief examination is also given to the effect of amplifier nonlinearity on the ambiguity function.

The Smith tube: Selection of radar chirp waveform bandwidth and power amplifier load impedance using multiple-bandwidth load-pull measurements

“…These two works present "fast load-pull" approaches to find the Pareto optimum load impedance under conflicting linearity and efficiency requirements that can be used for the real-time optimization of radar transmitters. In the case of radar transmitters, the waveform is yet another factor in the spectral spreading of the device, and we have also published previous separate works regarding the optimization of radar chirp waveforms [3,4]. These works, however, do not address the maximization of waveform bandwidth necessary for lowambiguity range detection.…”