US5168215A
Expired / Lapsed
US
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Instantaneous frequency measurement apparatus and method
Assignee: Lockheed Martin Corp
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Filing: 1991-11-15
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Granted: 1992-12-01
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Expires: 2011-11-15
Abstract
Abstract An apparatus and method for measuring the frequencies of a pair of signals simultaneously present in a composite signal, comprising the steps of includes components for squaring the composite signal, filtering the squared signal for separating a first pass band and a higher frequency second pass band, instantaneously measuring the frequencies of the first and second pass bands and determining the individual frequencies of the pair of signals from the measured frequencies of the first and second pass bands.
Inventors
- 👤 Dean C. Puzzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:41
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/16; G01R23/165; G01S; G01S7/00; G01S7/02; G01S7/021
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
72 words
An apparatus for measuring the frequencies of a pair of signals simultaneously present in a composite signal, comprising: means for squaring the composite signal; means for filtering the squared signal for separating a first pass band and a higher frequency second pass band; means for instantaneously measuring the frequencies of the first and second pass bands; and the pair of signals from the measured frequencies of the first and second pass bands.
Claim 2
Independent Claim
72 words
An apparatus for measuring the frequencies of a pair of signals simultaneously present in a composite signal, comprising: means for squaring the composite signal; means for filtering the squared signal for separating a first pass band and a higher frequency second pass band; means for instantaneously measuring the frequencies of the first and second pass bands; and the pair of signals from the measured frequencies of the first and second pass bands.
Claim 3
Dependent Claim
66 words
The apparatus of claim 1 wherein the means for determining includes computational means having means for halving the frequency measured for the second pass band for determining the average frequency of the pair of signals and means for respectively adding and subtracting half of the frequency measured for the first pass band to the average frequency for computing the individual frequencies of the pair of signals.
Claim 4
Dependent Claim
24 words
The apparatus of claim 1, wherein the means for squaring includes a double balanced mixer having two inputs coupled to receive the composite signal.
Claim 5
Dependent Claim
24 words
The apparatus of claim 1, further comprising means for detecting the filtered first pass band for determining the presence of more than one signal.
Claim 6
Dependent Claim
45 words
The apparatus of claim 4, further comprising: second means for filtering the squared signal for separating a third pass band having a lower frequency than the first pass band; and second means for detecting the third pass band for determining the presence of any signal.
Claim 7
Dependent Claim
51 words
The apparatus of claim 1, wherein the means for instantaneously measuring includes an IFM device and multiplexing means for sequentially coupling the first and second filtered pass bands to the IFM device including means for delaying one of the first and second pass bands for distinguishing the pass bands in time.
Claim 8
Dependent Claim
55 words
The apparatus of claim 6, wherein the multiplexing means includes second means for sequentially coupling the composite signal to the IFM device along with the first and second pass bands including second means for delaying the other of the first and second pass bands for distinguishing the pass bands in time from the composite signal.
Claim 9
Independent Claim
74 words
A method for measuring the frequencies of a pair of signals simultaneously present in a composite signal, comprising the steps of: squaring the composite signal; filtering the squared signal for separating a first pass band and a higher frequency second pass band; instantaneously measuring the frequencies of the first and second pass bands; and determining the individual frequencies of the pair of signals from the measured frequencies of the first and second pass bands.
Claim 10
Independent Claim
74 words
A method for measuring the frequencies of a pair of signals simultaneously present in a composite signal, comprising the steps of: squaring the composite signal; filtering the squared signal for separating a first pass band and a higher frequency second pass band; instantaneously measuring the frequencies of the first and second pass bands; and determining the individual frequencies of the pair of signals from the measured frequencies of the first and second pass bands.
Claim 11
Dependent Claim
62 words
The method of claim 8 wherein the step of determining includes the steps of determining the average frequency of the pair of signals by halving the frequency measured for the second pass band and computing the individual frequencies of the pair of signals by respectively adding and subtracting half of the frequency measured for the first pass band to the average frequency.
Claim 12
Dependent Claim
23 words
The method of claim 8, wherein the step of squaring includes coupling the composite signal to both inputs of a double balanced mixer.
Claim 13
Dependent Claim
25 words
The method of claim 8, further comprising the step of determining the presence of more than one signal by detecting the filtered first pass band.
Claim 14
Dependent Claim
42 words
The method of claim 11, further comprising: the steps of filtering the squared signal for separating a third pass band having a lower frequency than the first pass band; and detecting the third pass band for determining the presence of any signal.
Claim 15
Dependent Claim
42 words
The method of claim 8, wherein the step of instantaneously measuring includes sequentially coupling the first and second filtered pass bands to an IFM device including delaying one of the first and second pass bands for distinguishing the pass bands in time.
Claim 16
Dependent Claim
52 words
The method of claim 13, wherein the step of instantaneously measuring also includes sequentially coupling the composite signal to the IFM device along with the first and second pass bands including delaying the other of the first and second pass bands for distinguishing the pass bands in time from the composite signal.
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) | 1995-12-01 | 1996-06-01 | 1996-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-01 | 2000-06-01 | 2000-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-01 | 2004-06-01 | 2004-12-01 | $7700.00 | Window Closed / Lapsed |