초록 ▼

Doppler signals from a two-port radar system are spectrally processed and searched for a pattern of points wherein clutter at a first instant of time is subsequently replaced by low-level returns indicating the movement of a target. The rate of change of the low-level signals, along the same range b

Doppler signals from a two-port radar system are spectrally processed and searched for a pattern of points wherein clutter at a first instant of time is subsequently replaced by low-level returns indicating the movement of a target. The rate of change of the low-level signals, along the same range bin but different Doppler bins, is indicative of target azimuth position relative to the boresight of the radar antenna. The difference between the total Doppler detected from the target and the Doppler for the azimuth position of the black hole detection is the Doppler for the relative radial velocity of the target. Not only is the black hole and shadow (lack of detection) detectable but more measurable and detectable is the clutter signal difference with the target motion.

대표청구항 ▼

In a two-port synthetic aperture Doppler radar system, a method for detecting a moving target comprising the steps of detecting the absence of a radar signal return at a point, at a first instant of time; subsequently detecting a change of signal level, from the point, to a clutter signal indicative

In a two-port synthetic aperture Doppler radar system, a method for detecting a moving target comprising the steps of detecting the absence of a radar signal return at a point, at a first instant of time; subsequently detecting a change of signal level, from the point, to a clutter signal indicative of movement of the target; storing a series of points at which the changed signal level occurs; detecting signals from an apparent target at each port; measuring the difference of the signals from the apparent target and an actual moving target; and processing said signals and said difference of said signals by searching for a black hole in the same range bin as the detected target, the potential moving target being associated with the potential black hole, by interrogating the range Doppler bin before and after the range Doppler bin of the detected target and black hole and measuring and storing the value thereof and measuring each aperture in the same manner, the rate of change of a detected target in the same range bin being determinative of total Doppler velocity which includes an azimuth component and a radial velocity component thereby determining the radial velocity of the actual target relative to the two ports.