The moving object is a moving car driving up and down the runway. The test will be carried out at Twente Airport because there is not much traffic either on the ground or in the air, which means that the test can be carried out safely and without “noise” from other moving objects.
The tests are likely to take place on both days from 3 p.m. to 4.30 p.m. During the 1.5 hours, a number of “low” passes will be made over the runway at 1,500, 3,000 and 5,000 ft (between 450 and 1,500 metres), possibly supplemented by a “dive” above the runway, which will be broken off at 1,000 ft.
More about the FLANS (Flight test LIGNex1 AESA NLR Support) project: https://www.nlr.org/nl/newsroom/case/rd-case-integratie-en-certificering-van-lig-nex1s-aesa-radar-in-nlrs-cessna-citation-ii/