US3713145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse width control for radar transponders
Assignee: Motorola Solutions Inc
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Filing: 1970-11-09
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Granted: 1973-01-23
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Expires: 1990-11-09
Abstract
Abstract A radar transponder is disclosed which discriminates between the lengths of the pulses received and retransmits a pulse of one length upon receipt of a pulse of a short time duration and retransmits a pulse of a greater length upon receipt of a pulse of a longer time duration. The discriminator sets an output monostable multivibrator to produce the long pulse upon receipt of the long interrogation pulse and the output monostable multivibrator is then triggered by a delayed pulse that is responsive to the received pulse.
Inventors
- 👤 T Butler
- 👤 R Pflugfelder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:20
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/02; G01R29/027; G01R29/0273; G01S; G01S13/00; G01S13/74; G01S13/76
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
195 words
Means for producing a transponder output pulse whose duration depends on the duration of an interrogating radar pulse comprising: a triggerable monovibrator including an adjustable time constant means for controlling the duration of the output pulse produced thereby, said monovibrator producing an output pulse of a short duration when said time constant circuit is adjusted in one direction and which produces a long duration output pulse when said time constant circuit is adjusted in the opposite direction; means to produce a first pulse of a fixed length in response to an interrogating pulse and starting with the beginning of said interrogating pulse; means to provide a second pulse starting with the end of said first pulse and of a fixed length; means to provide a third pulse when said interrogating pulse and said second pulse are coincident; means responsive to said third pulse to change the time constant in a direction to change the length of said output pulse; and means for applying a triggering pulse to said triggerable monovibrator whereby said monovibrator produces a pulse of a duration controlled by the state of adjustment of said time constant circuit when said monovibrator is triggered.
Claim 2
Dependent Claim
195 words
Means for producing a transponder output pulse whose duration depends on the duration of an interrogating radar pulse comprising: a triggerable monovibrator including an adjustable time constant means for controlling the duration of the output pulse produced thereby, said monovibrator producing an output pulse of a short duration when said time constant circuit is adjusted in one direction and which produces a long duration output pulse when said time constant circuit is adjusted in the opposite direction; means to produce a first pulse of a fixed length in response to an interrogating pulse and starting with the beginning of said interrogating pulse; means to provide a second pulse starting with the end of said first pulse and of a fixed length; means to provide a third pulse when said interrogating pulse and said second pulse are coincident; means responsive to said third pulse to change the time constant in a direction to change the length of said output pulse; and means for applying a triggering pulse to said triggerable monovibrator whereby said monovibrator produces a pulse of a duration controlled by the state of adjustment of said time constant circuit when said monovibrator is triggered.
Claim 3
Dependent Claim
27 words
The apparatus of claim 1 in which means are provided for producing said triggering pulse in response to said interrogating pulse and at a delayed time thereafter.
Claim 4
Dependent Claim
50 words
The apparatus of claim 1 wherein the length of said fixed length pulse is greater than the lengths of an interrogating pulse of one length and the combined lengths of said fixed length pulse and said second pulse is within the length of another interrogating pulse of a greater length.
Claim 5
Dependent Claim
21 words
The apparatus of claim 1 wherein said means responsive to said third pulse to change the time constant comprises switch means.
Claim 6
Dependent Claim
22 words
The apparatus of claim 4 wherein said switch means are energized to effect an increase in the length of said output pulse.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |