US4047173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
FM pulse compression radar
Assignee: Westinghouse Electric Corp
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Filing: 1976-06-24
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Granted: 1977-09-06
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Expires: 1996-06-24
Abstract
Abstract An FM pulse compression radar for detecting moving targets is described wherein a predetermined sequence of FM signals spaced apart in time is transmitted, each successive FM signal in the sequence having an FM rate determined by a function of the amount of time since the sequence started. A reflected sequence of FM signals may be received wherein signals indicative of a moving target may be integrated in a single range cell.
Inventors
- 👤 Coleman J. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:51
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/10; G01S13/26; G01S13/28; G01S13/284; G01S13/286
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
80 words
A method for operating an FM pulse compression radar for detecting moving targets in a single range cell comprising the steps of: generating a predetermined sequence of spaced apart FM signals, each successive signal in said sequence having an FM rate determined by a function of the amount of time since said sequence started; transmitting said sequence of FM signals; and receiving reflected FM signals whereby signals indicative of a target may be integrated in a receiver at constant range.
Claim 2
Independent Claim
80 words
A method for operating an FM pulse compression radar for detecting moving targets in a single range cell comprising the steps of: generating a predetermined sequence of spaced apart FM signals, each successive signal in said sequence having an FM rate determined by a function of the amount of time since said sequence started; transmitting said sequence of FM signals; and receiving reflected FM signals whereby signals indicative of a target may be integrated in a receiver at constant range.
Claim 3
Dependent Claim
60 words
The method of claim 1 wherein said step of generating a sequence of spaced apart FM signals includes the steps of: generating timing signals; generating FM rate signals; generating a sequence of FM ramp signals in response to said timing signals and said FM rate signals; generating a carrier frequency; and mixing said carrier frequency with said FM ramp signals.
Claim 4
Dependent Claim
39 words
The method of claim 2 wherein said step of genertaing a sequence of FM ramp signals includes the steps of: starting the FM ramp signals at a minus frequency; and terminating the FM ramp signals at a positive frequency.
Claim 5
Dependent Claim
39 words
The method of claim 2 wherein said step of generating a sequence of FM ramp signals includes the steps of: starting the FM ramp signals at a positive frequency; and terminating the FM ramp signal at a negative frequency.
Claim 6
Dependent Claim
126 words
The method of claim 2 wherein said step of generating a sequence of FM ramp signals includes the steps of: a. generating and storing a first frequency, FM rate and first phase signal for each FM ramp signal in said sequence; b. determining and feeding out as a portion of said FM ramp signal the sine and cosine value of said first phase signal; c. adding said FM rate signal to said first frequency signal to form a second frequency signal; d. adding said first phase signal to said first frequency signal to form a second phase signal; e. storing said second frequency signal and said second phase signal as representing said first frequency signal and said first phase signal; f. repeating steps (a) through (e).
Claim 7
Dependent Claim
17 words
The method of claim 2 wherein said step of mixing includes the step of single sideband mixing.
Claim 8
Dependent Claim
72 words
The method of claim 2 wherein said step of generating FM rate signals includes the steps of: storing an initial time value T; subtracting from the initial time value T the time lapsed since the start of the first signal in the sequence to form a time value T N ; dividing the value of the carrier frequency by the time value T N to form a value for the FM rate.
Claim 9
Dependent Claim
60 words
The method of claim 1 wherein said step of generating a sequence of spaced apart FM signals includes the steps of: generating timing signals; generating FM rate signals; generating a sequence of FM ramp signals in response to said timing signals and said FM rate signals; generating a carrier frequency; and modulating said carrier frequency with said FM ramp signals.
Claim 10
Dependent Claim
73 words
An FM pulse compression radar for transmitting FM signals and receiving reflected FM signals for detecting moving targets in a single range cell comprising: means for generating a predetermined sequence of spaced apart FM signals, each successive signal in said sequence having an FM rate determined by a function of the amount of time since said sequence started; means for transmitting said sequence of FM signals; and means for receiving reflected FM signals.
Claim 11
Dependent Claim
73 words
An FM pulse compression radar for transmitting FM signals and receiving reflected FM signals for detecting moving targets in a single range cell comprising: means for generating a predetermined sequence of spaced apart FM signals, each successive signal in said sequence having an FM rate determined by a function of the amount of time since said sequence started; means for transmitting said sequence of FM signals; and means for receiving reflected FM signals.
Claim 12
Dependent Claim
66 words
The radar system of claim 9 wherein said means for generating a sequence of FM signals includes: means for generating timing signals; means for generating FM rate signals; means for generating a sequence of FM ramp signals in response to said timing signals and said FM rate signals; means for generating a carrier frequency; and means for mixing said carrier frequency with said FM ramp signals.
Claim 13
Dependent Claim
123 words
The radar system of claim 10 wherein said means for generating a sequence of FM ramp signals includes: means for generating and storing a first frequency, FM rate and first phase signal for each FM ramp signal in said sequence; means for determining and feeding out as a portion of said FM ramp signal the sine and cosine value of said first phase signal; means for adding said FM rate signal to said first frequency signal to form a second frequency signal; means for adding said first phase signal to said first frequency signal to form a second phase signal; means for storing said second frequency signal and said second phase signal as representing said first frequency signal and said first phase signal.
Claim 14
Dependent Claim
17 words
The radar system of claim 10 wherein said means for mixing includes means for single sideband mixing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |