초록 ▼

In accordance with a first arrangement, a non-coherent, pulse radar transmitter emits N-sequential signals of differing frequencies at predetermined time intervals, the transmitted pulses being directed toward a given target area of interest. Further included is a radar receiver for detecting and pr

In accordance with a first arrangement, a non-coherent, pulse radar transmitter emits N-sequential signals of differing frequencies at predetermined time intervals, the transmitted pulses being directed toward a given target area of interest. Further included is a radar receiver for detecting and processing the composite radar return signal samples of N differing frequencies which are reflected from a plurality of point scatterers located in the area of interest. The varying D.C. interference signal of the plural radar return signal samples occasioned by the differing frequencies are detected and a one-dimensional Fourier transformer is performed on that composite radar return signal samples to facilitate target identification. A programmed processor is used to dervie a plurality of feature characteristics from the Fourier transform of the detected radar return signals and the features so computed are compared with features characteristic of known potential targets on a best-match basis. In accordance with an alternative embodiment, a system is provided which can extract two-dimensional, high-resolution information from radar return signals in which the non-coherent pulse radar means is moved from one location to another with respect to a target area of interest while transmitting N-sequential signals of differing frequencies at predetermined time intervals. The radar receiver is positioned to detect and range gate composite radar return signal samples reflected from a plurality of point scatterers and once a time varying D.C. interference signal is detected, a two-dimensional Fourier transformation is performed on that composite signal.

대표청구항 ▼

Apparatus for extracting one-dimensional, high-resolution information from radar return signals, comprising: (a) non-coherent pulse radar means for transmitting N sequential signals of differing frequency at predetermined time intervals toward a given target area of interest from one radar location;

Apparatus for extracting one-dimensional, high-resolution information from radar return signals, comprising: (a) non-coherent pulse radar means for transmitting N sequential signals of differing frequency at predetermined time intervals toward a given target area of interest from one radar location; (b) non-coherent radar receiver means positioned to receive, detect and range gate the composite radar return signal samples of N differing frequencies reflected from a plurality of point scatterers located in said area of interest, wherein N is an integer greater than or equal to the ratio of radar pulse length to range resolution capability; (c) means for detecting the varying D.C. interference signal of said radar return signal samples from stationary targets occasioned by the differing frequencies at one radar location; and (d) means for performing a one-dimensional Fourier transformation on the detected and range gated composite non-coherent radar return signal samples of N different frequencies whereby high resolution target signature features become detectable.