Single-antenna ATSC passive radar observations with remodulation and keystone formatting

This paper describes passive radar observations using the ATSC digital television signal as an illuminator. The system has two unique attributes. First, it recovers the reference signal by remodulation of the surveillance channel, a process which permits a compact single-antenna receiver. Second, it is shown that keystone formatting of the cross-ambiguity data mitigates range walk of moving targets and allows meaningful increases to the integration time and sensitivity.