US5146229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constrained optimum matched illumination-reception radar
Assignee: Grumman Corp
•
Filing: 1991-06-25
•
Granted: 1992-09-08
•
Expires: 2011-06-25
Abstract
Abstract A pulse compression modified OMIR waveform s N (t) is obtained by computing the OMIR eigenfunctions φ i , i=1, 2, . . . , ∞, for an autocorrelation function of the expected target impulse response, specifying a waveform c(t) having a desired pulse compression characteristic, and generating expansion terms ##EQU1## for various expansion indices N, until a desired waveform is obtained. The expansion coefficients c i (t) are given by ##EQU2##
Inventors
- 👤 Joseph R. Guerci
- 👤 Robert W. Schutz
- 👤 John D. Hulsmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:17
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/10; G01S13/26; G01S13/28; G01S13/282
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
88 words
A method for designing a pulse compression compatible modified OMIR waveform, comprising the steps of: specifying a target, operating frequency, and receiver bandwidth; computing an autocorrelation function for an impulse response of the specified target, operating frequency and receiver bandwidth; computing OMIR eigenfunctions φ i , i=1, 2, . . . , ∞ for the autocorrelation function; specifying a waveform c(t) having a desired pulse compression characteristic; projecting c(t) onto one of said eigenfunctions to generate a waveform s N (t) which possesses the desired pulse compression characteristic.
Claim 2
Independent Claim
88 words
A method for designing a pulse compression compatible modified OMIR waveform, comprising the steps of: specifying a target, operating frequency, and receiver bandwidth; computing an autocorrelation function for an impulse response of the specified target, operating frequency and receiver bandwidth; computing OMIR eigenfunctions φ i , i=1, 2, . . . , ∞ for the autocorrelation function; specifying a waveform c(t) having a desired pulse compression characteristic; projecting c(t) onto one of said eigenfunctions to generate a waveform s N (t) which possesses the desired pulse compression characteristic.
Claim 3
Dependent Claim
48 words
A method as claimed in claim 1, wherein the autocorrelation function is given by ##EQU10## where T f →T i is an observation time interval, τ represents a time over which s (t) interacts with a target, and h 1 (t) is an impulse response of the target.
Claim 4
Dependent Claim
19 words
A method as claimed in claim 1, wherein ##EQU11## and ##EQU12## where T is the duration of waveform c(t).
Claim 5
Dependent Claim
22 words
A method as claimed in claim 3, wherein expansion index N is gradually incremented until the desired pulse compression characteristic is obtained.
Claim 6
Dependent Claim
16 words
A method as claimed in claim 1, wherein c(t) is set equal to the chirp waveform.
Claim 7
Dependent Claim
94 words
A radar system, wherein c(t) is a waveform having a desired pulse transmission characteristic and wherein a transmitted radar waveform, as a function of time t, has the form ##EQU13## and ##EQU14## and wherein φ i (t), i=1, 2, . . . , ∞, are the eigenfunctions associated with an optimum matched illumination-reception waveform integral equation having the form ##EQU15## where h i (t) is an impulse response of a target, T i →T f is an arbitrary observation interval, and τ represents the time over which s N (t) interacts with the target.
Claim 8
Dependent Claim
94 words
A radar system, wherein c(t) is a waveform having a desired pulse transmission characteristic and wherein a transmitted radar waveform, as a function of time t, has the form ##EQU13## and ##EQU14## and wherein φ i (t), i=1, 2, . . . , ∞, are the eigenfunctions associated with an optimum matched illumination-reception waveform integral equation having the form ##EQU15## where h i (t) is an impulse response of a target, T i →T f is an arbitrary observation interval, and τ represents the time over which s N (t) interacts with the target.
References Cited (Backward Citations)
US3216013A
Cited
US3614719A
Cited
US4580139A
Cited
US4992797A
Cited
US4626853A
Cited
US4901082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-08 | 1996-03-09 | 1996-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-08 | 2000-03-09 | 2000-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-08 | 2004-03-09 | 2004-09-08 | $7700.00 | Window Closed / Lapsed |