초록 ▼

A radar system comprising a filter with a variable pass band to which radar video signals are fed, data storage means including a main store having a plurality of storage addresses into which data appertaining to the velocity of targets in a plurality of range bearing cells is fed one cell to each a

A radar system comprising a filter with a variable pass band to which radar video signals are fed, data storage means including a main store having a plurality of storage addresses into which data appertaining to the velocity of targets in a plurality of range bearing cells is fed one cell to each address and control signal producing means operative to set the frequency of the filter in dependence upon stored data so that for reception of video signals appertaining to any specified range/bearing cell the frequency of the filter is set in dependence upon the data stored in the address of the main store corresponding to that specified range/bearing cell which appertains to the velocity of any target detected in that range/bearing cell in immediately preceding scans.

대표청구항 ▼

A radar system for the detection of non-clutter type moving targets, comprising: velocity estimator means for producing sequentially, in respect of received radar return signals from objects detected during each complete angular scan, corresponding signals indicative of the velocity of the objects;

A radar system for the detection of non-clutter type moving targets, comprising: velocity estimator means for producing sequentially, in respect of received radar return signals from objects detected during each complete angular scan, corresponding signals indicative of the velocity of the objects; averager means responsive to the corresponding signals from the velocity estimator means for providing data appertaining to the average value, over a plurality of angular scans, of the velocity of detected objects; main store means having a plurality of storage addresses for receiving and storing the data appertaining to the average value of the velocity of said detected objects as sensed at instants in time corresponding to a corresponding number of range/bearing cells, one cell to each address; moving clutter filter means for receiving radar return signals, having a frequency passband which can be varied in response to control signals, and having an output line; and control signal producing means for producing control signals for setting the frequency passband of the moving clutter filter means, in dependence upon the data stored in the main store means, to a frequency which reflects an average clutter velocity sensed in a cell during said plurality of scans so that, for the reception of radar return signals in a specified range/bearing cell, the frequency of the moving clutter filter means is set to pass to the output line only those signals having a frequency which corresponds to a velocity which is different from the average clutter velocity sensed in that cell during said plurality of scans, and which could therefore be indicative of a non-clutter type moving target.