Patent US3723870A successfully refreshed from Google Patents.
US3723870A
Expired / Lapsed
US
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Device for measurement of pulse-to-pulse carrier frequency shift
Assignee: TDK Micronas GmbH
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Filing: 1970-11-18
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Granted: 1973-03-27
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Expires: 1990-11-18
Abstract
Abstract A system for the instantaneous measurement of the carrier frequency in a pulsed radar system, particularly useful in frequency stability analysis of the output of self-excited microwave frequency generators, such as magnetrons, etc. A dispersive delay line, preferably of the type operative in the intermediate frequency domain is employed with appropriate downconversion ahead of the delay line input. A cathode ray display device horizontal sweep is generated synchronously with the magnetron PRF and the output of the dispersive delay line is presented in the appearance of spectral lines on the vertical deflection coordinate thereof. The dispersive delay line inherently provides a frequency time delay conversion so that the cathode ray display device may be calibrated in terms of frequency.
Inventors
- 👤 T Donahue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:47
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/40; G01S7/4004; G01S7/4008; G01R; G01R23/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
188 words
Apparatus for measurement of the frequency of the energy output from a pulsed radio frequency generator, comprising: a mixer and local oscillator of substantially invariant frequency connected to receive a portion of said energy output from said pulsed radiofrequency generator to produce mixer output pulses; a dispersive delay line operative within the frequency domain of said mixer output pulses and connected to receive said mixer output pulses to produce corresponding delay line output pulses discretely time delayed by an amount which is a function of the individual frequencies of said converter output pulses; a cathode ray indicating device including means for generating and applying a sweep in a first deflection coordinate of said indicating device; synchronizing means for controlling the initiation of said sweep at a predetermined time with respect to said radio-frequency generator output pulses, said synchronizing means also controlling the initiation of said energy pulses from said radio-frequency generator; and means for applying said delay line output pulses to the second deflection coordinate of said indicating means to produce a presentation which may be calibrated in frequency along the axis corresponding to said first deflection coordinate.
Claim 2
Dependent Claim
188 words
Apparatus for measurement of the frequency of the energy output from a pulsed radio frequency generator, comprising: a mixer and local oscillator of substantially invariant frequency connected to receive a portion of said energy output from said pulsed radiofrequency generator to produce mixer output pulses; a dispersive delay line operative within the frequency domain of said mixer output pulses and connected to receive said mixer output pulses to produce corresponding delay line output pulses discretely time delayed by an amount which is a function of the individual frequencies of said converter output pulses; a cathode ray indicating device including means for generating and applying a sweep in a first deflection coordinate of said indicating device; synchronizing means for controlling the initiation of said sweep at a predetermined time with respect to said radio-frequency generator output pulses, said synchronizing means also controlling the initiation of said energy pulses from said radio-frequency generator; and means for applying said delay line output pulses to the second deflection coordinate of said indicating means to produce a presentation which may be calibrated in frequency along the axis corresponding to said first deflection coordinate.
Claim 3
Independent Claim
162 words
A system for instantaneous measurement of the frequency generated by a pulsed radio frequency generator, comprising: a superheterodyne mixer and a local oscillator of substantially constant frequency operatively associated therewith; means for coupling a portion of the pulsed output energy from said generator to said mixer, whereby said mixer produces pulsEs of energy at intermediate frequency; a dispersive delay line responsive to said intermediate frequency pulses, for producing output pulses from said delay line which are discretely delayed with respect to the corresponding input pulses to said delay line as a function of frequency of said radio frequency generator during each of said input pulses; a cathode ray indicating device including a sweep applied to one deflection coordinate of said indicating device; synchronizing means connected for initiating said sweep at a predetermined time related to the occurrence of each of said pulses from said generator; and means for applying said delay line output to the other deflection coordinate of said indicating device.
Claim 4
Independent Claim
162 words
A system for instantaneous measurement of the frequency generated by a pulsed radio frequency generator, comprising: a superheterodyne mixer and a local oscillator of substantially constant frequency operatively associated therewith; means for coupling a portion of the pulsed output energy from said generator to said mixer, whereby said mixer produces pulsEs of energy at intermediate frequency; a dispersive delay line responsive to said intermediate frequency pulses, for producing output pulses from said delay line which are discretely delayed with respect to the corresponding input pulses to said delay line as a function of frequency of said radio frequency generator during each of said input pulses; a cathode ray indicating device including a sweep applied to one deflection coordinate of said indicating device; synchronizing means connected for initiating said sweep at a predetermined time related to the occurrence of each of said pulses from said generator; and means for applying said delay line output to the other deflection coordinate of said indicating device.
Claim 5
Dependent Claim
41 words
The invention defined in claim 2 including a video detector connected to receive the output pulses of said delay line thereby to reduce said pulses to the video frequency realm before application to said other deflection coordinate of said indicating device.
Claim 6
Dependent Claim
76 words
Apparatus according to claim 3 including a threshold circuit and a following trigger generator connected between said video detector and said other deflection coordinate of said indicating device, whereby said delay line output pulse may be passed only to the extent that they exceed a predetermined amplitude, and whereby said pulses thus passed are formed into relatively narrow pulses of uniform duration so as to be readily compared to any frequency calibrations on said indicating device.
Claim 7
Dependent Claim
21 words
Apparatus according to claim 3 in which said dispersive delay line is defined as being of the acoustic diffraction grating type.
Claim 8
Dependent Claim
27 words
Apparatus according to claim 5 in which said diffraction grating type of dispersive delay line is defined as being made in the form of fused quartz plates.
Claim 9
Dependent Claim
40 words
Apparatus according to claim 6 including a predeterminable delayable trigger generating circuit between said means for synchronizing the initiation of said sweep and said means for generating and applying said sweeps to provide calibration of said cathode ray indicating device.
Claim 10
Dependent Claim
36 words
Apparatus according to claim 6 including an amplifier preceding said dispersive delay line to provide an adequate level of drive power therefor, and an additional amplifier after said dispersive delay line to compensate for attenuation therein.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |