Back to results
US 4,062,011 AGranted
MTI System processor and method
AssigneeControl Data Corporation
InventorsGlenn W. Preston, Walter H. Chudleigh, Jr., William G. Ehrich
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeControl Data Corporation
InventorsGlenn W. Preston, Walter H. Chudleigh, Jr., William G. Ehrich
Estimating the term…
A method and apparatus for removing the effects of radar platform movement and for otherwise processing doppler radar signals in a moving target indicator doppler radar in which targets in the main beam having reflective characteristics sufficient to override side lobe attenuation are tracked relative to the side lobes and the residual doppler frequency for such targets resulting from side lobe detection calculated. Based on this calculation, the appropriate ones of a bank of doppler filters are inhibited at the appropriate range bin to prevent a false target indication without inhibiting the display of moving targets in the main beam at the same range but having different doppler frequencies. A novel automatic gain control circuit which provides dynamic amplitude adjustment of the radar return signal to match the dynamic range of the radar processor on a range bin-by range bin basis is also provided as is a novel signal processing circuit for removing the effects of radar platform movement from the radar return signal. The use of a sensitivity time control is disclosed as is the method of vector rotation and quadrant resolution.
An MTI system comprising:
An MTI system comprising:
A method of removing the effects of radar platform movement from a doppler radar signal comprising the steps of:
A method of processing a doppler radar signal comprising the steps of:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
No related US applications are recorded in the indexed filing history.
Performing filtering on the whole spectrum without loss of range information, e.g. using delay line cancellers or comb filters: iF cancellers,…
Based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi: with…
Radio direction-finding
Term ended 6 Dec 1994 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The present invention relates to a signal processor for a moving target indicator and more specifically, to the method of removing the effects of radar platform movement in such systems.
Background material relevant to an understanding of the present invention may be found in the copending applications Ser. No. 278,479 of Walter H. Chudleigh, Jr. entitled "Automatic Gain Control Circuit and Method" and Ser. No. 278,478 of Walter H. Chudleigh, Jr. entitled "MTI System and Method", both of said applications being filed concurrently herewith, assigned to the assignee of the present invention, and hereby incorporated herein by reference.
It is an object of the present invention to provide an automatic gain control system which permits simplification of the radar processor.
FIG. 1 is a functional block diagram of the system of the present invention;
FIG. 2 is a more detailed block diagram of the I.sub.A channel of the system of FIG. 1;
FIG. 3 is a functional block diagram of the TACCAR unit of FIG. 1;
The present invention may be more readily understood by reference to the detailed description as set out in accordance with the following table of contents:
I. mti system (FIGS. 1 and 2)
Ii. taccar (figs. 3-7)