Time base correction technique and amplitude correction technique in antenna time domain near field measurement

In the practice of antenna time domain near field measurement, the biggest errors are introduced by the time base jitter and the amplitude changing of pulse generator. Comparing with the errors caused by amplitude changing, the errors caused by time base jitter are more serious that it can result in unbearable aberrance of measurement pattern. To deal with this problem, the technique of time base correction and amplitude correction is presented in this paper. Besides measuring channel, this technique adds a reference channel in measuring system. Pulse generator's time base jitter and amplitude changing can be obtained from the reference channel, and be adopted to correct measuring channel's signal. The practical measuring results have proved this method's reliability. From comparing experiments, we can find that adopting this technique, the sensitivity of time domain near field measurement is similar to the sensitivity of frequency domain near field measurement, or even better than it.