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US5321409A
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Radar system utilizing chaotic coding
Assignee: Raytheon Co
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Filing: 1993-06-28
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Granted: 1994-06-14
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Expires: 2013-06-28
Abstract
Abstract A radar system (20) has a chaotic code source (22) with a chaotic code output (23), which generates a chaotic code according to a chaotic difference equation. The radar system (20) further includes a transmitter (24) with a carrier signal source (28) of a carrier signal (29), and an encoder (30) having as a first input the carrier signal (29) of the carrier signal source (28) and as a second input the chaotic code output (23) of the chaotic code source (22), and as an output a transmitted radar signal (36) having the chaotic code output (23) encoded onto the carrier signal (29). A radar system receiver (26) includes a correlator (46) having as a first input the chaotic code output (23) of the chaotic code source (22) and as a second input a received radar signal (44), and as an output an indication of the correlation of the first and second inputs. The correlation is used to determine the distance, speed, or other characteristic of an object that reflected the radar signal.
Inventors
- 👤 W. T. Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:55
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/10; G01S13/26; G01S13/28; G01S13/284; G01S13/288
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
116 words
A radar system, comprising: a chaotic code source having a chaotic code output; a transmitter including a carrier signal source of a carrier signal, and an encoder having as a first input the carrier signal of the carrier signal source and as a second input the chaotic code output of the chaotic code source, and as an output a transmitted radar signal having the chaotic code output encoded onto the carrier signal; and a receiver including a correlator having as a first input the chaotic code output of the chaotic code source and as a second input a received radar signal, and as an output an indication of the correlation of the first and second inputs.
Claim 2
Dependent Claim
116 words
A radar system, comprising: a chaotic code source having a chaotic code output; a transmitter including a carrier signal source of a carrier signal, and an encoder having as a first input the carrier signal of the carrier signal source and as a second input the chaotic code output of the chaotic code source, and as an output a transmitted radar signal having the chaotic code output encoded onto the carrier signal; and a receiver including a correlator having as a first input the chaotic code output of the chaotic code source and as a second input a received radar signal, and as an output an indication of the correlation of the first and second inputs.
Claim 3
Dependent Claim
21 words
The radar system of claim 1, wherein the chaotic code source includes a source of a one-dimensional chaotic code source map.
Claim 4
Dependent Claim
61 words
The radar system of claim 1, wherein the chaotic code source includes a chaotic map generator having as an input a selectable seed value or an immediately prior output of the chaotic map generator, and as an output a current output of the chaotic map generator, and a quantizer having as an input the current output of the chaotic map generator.
Claim 5
Dependent Claim
43 words
The radar system of claim 1, wherein the encoder includes a multiplier having as a first input the radar carrier signal and as a second input a time series of the chaotic code source, and as an output a modulated transmitted radar signal.
Claim 6
Dependent Claim
51 words
A radar system, comprising: means for transmitting a transmitted radar wave having a wave form determined according to a chaotic code; and means for receiving a reflection of the transmitted radar wave from an object and for determining a characteristic of the object from the reflection of the transmitted radar wave.
Claim 7
Dependent Claim
51 words
A radar system, comprising: means for transmitting a transmitted radar wave having a wave form determined according to a chaotic code; and means for receiving a reflection of the transmitted radar wave from an object and for determining a characteristic of the object from the reflection of the transmitted radar wave.
Claim 8
Dependent Claim
70 words
The radar system of claim 5, wherein the means for transmitting includes a chaotic code source that produces a chaotic code, and a transmitter including a carrier signal source of a carrier signal, and an encoder having as a first input the carrier signal of the carrier signal source and as a second input the chaotic code of the chaotic code source, and as an output a transmitted radar signal.
Claim 9
Dependent Claim
34 words
The radar system of claim 5, wherein the means for receiving includes a correlator having as a first input a chaotic code and as a second input the reflection of the transmitted radar wave.
Claim 10
Dependent Claim
40 words
The radar system of claim 5, wherein the means for receiving includes a plurality of correlators, each correlator having as a first input a sequence of chaotic code and as a second input the reflection of the transmitted radar wave.
Claim 11
Dependent Claim
16 words
The radar system of claim 8, wherein each correlator utilizes a different sequence of chaotic code.
Claim 12
Dependent Claim
138 words
A radar system, comprising: means for transmitting a transmitted radar wave having a wave form determined according to a chaotic code; and a receiver, comprising a multielement delay line having as an input a received baseband radar signal and as an output a plurality of copies of the received baseband radar signal that are temporally offset from each other, a correlator including a multiplier having as a first input a sequence of the chaotic code and as a second input the plurality of temporally offset copies of the received baseband radar signal produced by the delay line, and having as an output a bit-by-bit product of the sequence of the chaotic code and each copy of the received baseband radar signal, and an adder that adds the bit-by-bit products for each copy of the received baseband radar signal.
Claim 13
Dependent Claim
138 words
A radar system, comprising: means for transmitting a transmitted radar wave having a wave form determined according to a chaotic code; and a receiver, comprising a multielement delay line having as an input a received baseband radar signal and as an output a plurality of copies of the received baseband radar signal that are temporally offset from each other, a correlator including a multiplier having as a first input a sequence of the chaotic code and as a second input the plurality of temporally offset copies of the received baseband radar signal produced by the delay line, and having as an output a bit-by-bit product of the sequence of the chaotic code and each copy of the received baseband radar signal, and an adder that adds the bit-by-bit products for each copy of the received baseband radar signal.
Claim 14
Dependent Claim
70 words
The radar system of claim 10, wherein the means for transmitting includes a chaotic code source that produces a chaotic code, and a transmitter including a carrier signal source of a carrier signal, and an encoder having as a first input the carrier signal of the carrier signal source and as a second input the chaotic code of the chaotic code source, and as an output a transmitted radar signal.
Claim 15
Dependent Claim
92 words
The radar system of claim 10, the receiver comprising a plurality of correlators, each correlator including a multiplier having as a first input a sequence of the chaotic code and as a second input the plurality of temporally offset copies of the received baseband radar signal produced by the delay line, and having as an output a bit-by-bit product of the sequence of the chaotic code and each copy of the received baseband radar signal, and an adder that adds the bit-by-bit products for each copy of the received baseband radar signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-06-13 | 1997-12-13 | 1998-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-13 | 2001-12-13 | 2002-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-13 | 2005-12-13 | 2006-06-14 | $7700.00 | Window Closed / Lapsed |