Communications: directive radio wave systems and devices (e.g. – Determining distance – With pulse modulation
Patent
1999-03-15
2000-08-29
Gregory, Bernarr E.
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With pulse modulation
342118, 342134, 342136, 342159, 342195, G01S 728, G01S 1312, G01S 1318
Patent
active
061115371
ABSTRACT:
Method for reducing false target echo indications in a pulse Doppler radar having at least two different pulse repetition frequencies during the period in which the main beam of the radar illuminates a target. A target which is detected gives rise to a number of primary detections in each PRF. The method includes use of at least one variable criterion and a final criterion, which are both of the M/N type. The factor M in the variable criterion is initially greater than the factor M in the final criterion. The method also includes the feature that primary detections which are all to be found in the same range gate in a number of PRF's, which number is equal to the factor M in the variable criterion, are approved as targets in this range gate. If the factor M in the variable criterion and the final criterion are not equal, the approved primary detections and all other primary detections corresponding thereto, are removed from further processing, and if the factor M in the variable and the other criterion are not equal, a predetermined number is subtracted from the factor M in the variable criterion.
REFERENCES:
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patent: 4106019 (1978-08-01), Alexander et al.
patent: 4584579 (1986-04-01), Frost et al.
patent: 4642641 (1987-02-01), Campbell
patent: 4816833 (1989-03-01), Ferguson et al.
patent: 4954830 (1990-09-01), Krikorian et al.
Gregory Bernarr E.
Telefonaktiebolaget LM Ericsson
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