In planetary radar astronomy, a microwave (or radar) pulse is transmitted toward a planetary target (e.g. Moon, asteroid, etc.) and the echo from the target is measured.
ɪn plˈænɪtˌɛɹi ɹˈeɪdɑːɹ ɐstɹˈɑːnəmi, ɐ mˈaɪkɹoʊwˌeɪv ɔːɹ ɹˈeɪdɑːɹ pˈʌls ɪz tɹænsmˈɪɾᵻd təwˈɔːɹd ɐ plˈænɪtˌɛɹi tˈɑːɹɡɪt ˈiː.dʒˈiː. mˈuːn, ˈæstɚɹˌɔɪd, ɛtsˈɛtɹə.ænd ðɪ ˈɛkoʊ fɹʌmðə tˈɑːɹɡɪt ɪz mˈɛʒɚd.