EP0414567A2
Expired / Lapsed
EP
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Frequency modulated continuous wave radar receiver
Assignee: BAE Systems Electronics Ltd
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Filing: 1990-08-24
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Granted: —
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Expires: 2010-08-24
Abstract
Abstract FMCW radar return signals are converted to i.f. in front end section 6, digitised in A-D converter 16, and reduced to in-phase and quadrature base band components at a lower sampling rate in filter section 8. The returns are compared with a separate reference waveform signal from generator 25 for each range cell 1, 2, 3 etc by means of multiplier 26 and accumulate and dump function 27. The reference waveforms for subsequent range cells are delayed by one sample period. The provision of separate correlation of de-ramping for each range cell enables non-linear sweep wave forms to be employed, whereas the prior art method using a single Fourier Transform for all range cells simultaneously restricted operation to a linear sweep waveform.
Inventors
- 👤 Timothy Brook Pearce Pearce
- 👤 Brent Summers
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 10:44
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32; G01S13/34; G01S13/343
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
64 words
A radar receiver for a frequency modulated continuous wave radar signal, comprising means for producing a digitised signal derived from the radar returns, and means for correlating the digitised signals corresponding to a modulation period with each of a series of digitised reference modulation signals which are delayed by predetermined periods with respect to each other, to produce outputs corresponding to respective range cells.
Claim 2
Dependent Claim
64 words
A radar receiver for a frequency modulated continuous wave radar signal, comprising means for producing a digitised signal derived from the radar returns, and means for correlating the digitised signals corresponding to a modulation period with each of a series of digitised reference modulation signals which are delayed by predetermined periods with respect to each other, to produce outputs corresponding to respective range cells.
Claim 3
Dependent Claim
29 words
A radar receiver as claimed in claim 1, in which the correlating means is arranged to perform complex multiplication of the digitised radar returns signals with digitised reference signals.
Claim 4
Dependent Claim
30 words
A radar receiver as claimed in claim 2 in which correlating means is arranged to perform a complex summation of the results of the complex multiplication for a modulation period.
Claim 5
Dependent Claim
29 words
A radar receiver as claimed in claim 3, in which the correlating means is arranged such that the output of the complex summation is sampled once per modulation period.
Claim 6
Dependent Claim
25 words
A radar receiver as claimed in claim 3 or claim 4, including an accumulate and dump to perform the complex summation for each range cell.
Claim 7
Dependent Claim
31 words
A radar receiver as claimed in any one of claims 1 to 5, in which the correlating means is such that the said predetermined periods are one sample period in duration.
Claim 8
Dependent Claim
15 words
A radar receiver for a frequency modulated continuous wave radar signal substantially as hereinbefore described.
Claim 9
Dependent Claim
15 words
A radar receiver for a frequency modulated continuous wave radar signal substantially as hereinbefore described.
Claim 10
Independent Claim
64 words
A method of analysising radar returns for a frequency modulated continuous wave radar signal, in which digitised signals derived from the radar returns are produced, and the digitised signals corresponding to a modulation period are correlated with each of a series of digitised reference modulation signals which delayed by predetermined periods with respect to each other, and producing outputs corresponding to respective range cells.
Claim 11
Independent Claim
64 words
A method of analysising radar returns for a frequency modulated continuous wave radar signal, in which digitised signals derived from the radar returns are produced, and the digitised signals corresponding to a modulation period are correlated with each of a series of digitised reference modulation signals which delayed by predetermined periods with respect to each other, and producing outputs corresponding to respective range cells.
Claim 12
Independent Claim
13 words
A method substantially as herein before described with reference to the accompanying drawings.
Claim 13
Independent Claim
13 words
A method substantially as herein before described with reference to the accompanying drawings.
References Cited (Backward Citations)
No citation records indexed.
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