US3594795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radar system
Assignee: General Electric Co
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Filing: 1968-12-23
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Granted: 1971-07-20
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Expires: 1988-12-23
Abstract
Abstract The present invention deals with a multiple stage pulse modifying filter having a time delay characteristic which is a function of frequency over a prescribed band of frequencies and a radar system which incorporates this filter. The filter has a double input and a single output, the respective paths between the respective inputs and said output having a reciprocal transfer characteristic over a prescribed band of frequencies. During transmission the filter is used to expand a short duration pulse applied to one input terminal and the expanded pulse is coupled from the output terminal of the filter to a transmitter for transmission. The echo of the transmitted pulse is then applied to the second input terminal of the filter for compression of the received echo pulse. The shortened echo pulse is then compared with the initial short duration pulse to obtain range information. Each stage of the band-pass filter save for the first consists of a time delay element connected in series with a band-pass filter, the first stage having a band-pass filter, with each subsequent stage being coupled between the input and output terminals of the band-pass filter of the preceding stage.
Inventors
- 👤 Robert C Thor
- 👤 Earl R Wingrove Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:36
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/10; G01S13/26; G01S13/28; G01S13/282; G01S13/284; G01S13/286
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
A radar system comprising a source of short duration pulses of radiofrequency waves, a filter having a double input and single output, the transfer characteristic between the first of said inputs and said output being a first function of frequency and the transfer characteristic between the second input and said output being conjugate to said first transfer characteristic, means for coupling said source to said first input, a transmitter coupled to the output of said filter for amplifying the pulses transfered through said filter and transmitting the same, means for receiving echoes of said transmitted pulses, means for applying said received pulses to said second input terminal of said filter, and means coupled to said source and to the output of said filter for comparing the initial short pulses and the shortened received pulses.
Claim 2
Dependent Claim
134 words
A radar system comprising a source of short duration pulses of radiofrequency waves, a filter having a double input and single output, the transfer characteristic between the first of said inputs and said output being a first function of frequency and the transfer characteristic between the second input and said output being conjugate to said first transfer characteristic, means for coupling said source to said first input, a transmitter coupled to the output of said filter for amplifying the pulses transfered through said filter and transmitting the same, means for receiving echoes of said transmitted pulses, means for applying said received pulses to said second input terminal of said filter, and means coupled to said source and to the output of said filter for comparing the initial short pulses and the shortened received pulses.
Claim 3
Dependent Claim
208 words
A multiple stage pulse modifying filter having a double input and a single output, the respective paths between said respective inputs and said output having reciprocal transfer characteristics over a prescribed band of frequencies, each of said stages after the first having a time delay element connected in series with a band-pass filter, said first stage having a band-pass filter, the respective input and output terminals of each subsequent stage being coupled to the respective input and output terminals of the band-pass filter of the preceding stage, the widths of the passbands of said band-pass filters and the reciprocal of the time delays of said time delay elements all being equal to the same quantity for insuring an in phase addition of components lying at the edges of said passbands, the passbands of the band-pass filters in adjoining stages intersecting at the one-half gain point so as to provide continuous passage to waves lying between the frequency limits of said prescribed band, the first input and output terminal of said pulse modifying filter being respectively the input and output terminal of the band-pass filter in said first stage, the second input of said pulse modifying filter being the input terminal of the band-pass filter in the last stage.
Claim 4
Dependent Claim
208 words
A multiple stage pulse modifying filter having a double input and a single output, the respective paths between said respective inputs and said output having reciprocal transfer characteristics over a prescribed band of frequencies, each of said stages after the first having a time delay element connected in series with a band-pass filter, said first stage having a band-pass filter, the respective input and output terminals of each subsequent stage being coupled to the respective input and output terminals of the band-pass filter of the preceding stage, the widths of the passbands of said band-pass filters and the reciprocal of the time delays of said time delay elements all being equal to the same quantity for insuring an in phase addition of components lying at the edges of said passbands, the passbands of the band-pass filters in adjoining stages intersecting at the one-half gain point so as to provide continuous passage to waves lying between the frequency limits of said prescribed band, the first input and output terminal of said pulse modifying filter being respectively the input and output terminal of the band-pass filter in said first stage, the second input of said pulse modifying filter being the input terminal of the band-pass filter in the last stage.
Claim 5
Dependent Claim
194 words
A radar system comprising a source of short duration pulses of radiofrequency waves, a multiple stage pulse modifying filter having a time delay characteristic which is a function of frequency over a band of frequencies adequate to reproduce said short duration pulse, each of said stages after the first having a time delay element connected in series with a band-pass filter, said first stage having a band-pass filter, the respective input and output terminals of each subsequent stage being coupled to the respective input and output terminals of the band-pass filter of the preceding stage, means coupling said source to the input terminal of the first band-pass filter, a transmitter coupled to the output terminals of each stage of said pulse modifying filter for amplifying the pulses modified therein and transmitting the same, means for receiving echoes of said transmitted pulse, means for applying said received pulses to the input terminal of the last of the band-pass filters in said pulse modifying filter, and means coupled to the output terminals of each stage of said pulse modifying filter and to said source for comparing the shortened received pulses and the initial short duration pulses.
Claim 6
Dependent Claim
194 words
A radar system comprising a source of short duration pulses of radiofrequency waves, a multiple stage pulse modifying filter having a time delay characteristic which is a function of frequency over a band of frequencies adequate to reproduce said short duration pulse, each of said stages after the first having a time delay element connected in series with a band-pass filter, said first stage having a band-pass filter, the respective input and output terminals of each subsequent stage being coupled to the respective input and output terminals of the band-pass filter of the preceding stage, means coupling said source to the input terminal of the first band-pass filter, a transmitter coupled to the output terminals of each stage of said pulse modifying filter for amplifying the pulses modified therein and transmitting the same, means for receiving echoes of said transmitted pulse, means for applying said received pulses to the input terminal of the last of the band-pass filters in said pulse modifying filter, and means coupled to the output terminals of each stage of said pulse modifying filter and to said source for comparing the shortened received pulses and the initial short duration pulses.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |