US3868686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Range tracking device for a portable attack warning radar
Assignee: United States Department of the Navy
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Filing: 1973-04-16
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Granted: 1975-02-25
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Expires: 1993-04-16
Abstract
Abstract A range tracking device in which the range response or range resolution of a psuedo-random-noise radar is the result of the cross-correlation of a coded transmitted signal backscattered from a target with an identical code in the receiver which has been shifted in time.
Inventors
- 👤 William Ray Magorian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:48
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32; G01S13/325; G01S13/66; G01S13/70; G06; G06V; G06V20/00; G06V20/60; G06V20/64
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
351 words
A portable attack warning radar range tracking system comprising: radio frequency carrier means for generating a carrier at a predetermined frequency; first generating means for supplying a voltage output that varies from a maximum to a minimum voltage to form a pulsed repetitive code; phase modulating means coupled to electrically receive an output from said first generating means and an output from said radio frequency carrier means for supplying an output signal to shift the phase of the carrier in response to the pulsed repetitive code voltage output of said first generating means; antenna means for transmitting the output of said phase modulating means and recEiving an echo return signal from a target; second generating means for supplying a voltage output that varies from a maximum to a minimum voltage to form a pulsed repetitive code that is identical to the pulsed repetitive code output of said first generating means; clock means coupled to said first generating means via a first gate and coupled to said second generating means via a second gate for clocking said first and second generating means in time sequence; receiver mixer coupled to said antenna means and said radio frequency carrier means for providing an output signal representative of the target echo signal; code decorrelator means coupled to said receiver mixer and said second generating means; summing means coupled to said code decorrelator means for supplying a voltage output that represents the time difference between the pulsed repetitive code output of said second generating means and the pulsed repetitive code of the target echo signal coupled from said receiver mixer; and inhibit pulse generating means coupled to receive the output from said summing means for supplying inhibit signals to said first gate and to said second gate; whereby the time difference between the pulsed repetitive code output of the second generating means and the pulsed repetitive code output from the receiver mixer is reduced to a minimum by inhibit signals to the first and the second gating means for allowing a moving target to be tracked as its range to a radar location increases and decreases.
Claim 2
Dependent Claim
351 words
A portable attack warning radar range tracking system comprising: radio frequency carrier means for generating a carrier at a predetermined frequency; first generating means for supplying a voltage output that varies from a maximum to a minimum voltage to form a pulsed repetitive code; phase modulating means coupled to electrically receive an output from said first generating means and an output from said radio frequency carrier means for supplying an output signal to shift the phase of the carrier in response to the pulsed repetitive code voltage output of said first generating means; antenna means for transmitting the output of said phase modulating means and recEiving an echo return signal from a target; second generating means for supplying a voltage output that varies from a maximum to a minimum voltage to form a pulsed repetitive code that is identical to the pulsed repetitive code output of said first generating means; clock means coupled to said first generating means via a first gate and coupled to said second generating means via a second gate for clocking said first and second generating means in time sequence; receiver mixer coupled to said antenna means and said radio frequency carrier means for providing an output signal representative of the target echo signal; code decorrelator means coupled to said receiver mixer and said second generating means; summing means coupled to said code decorrelator means for supplying a voltage output that represents the time difference between the pulsed repetitive code output of said second generating means and the pulsed repetitive code of the target echo signal coupled from said receiver mixer; and inhibit pulse generating means coupled to receive the output from said summing means for supplying inhibit signals to said first gate and to said second gate; whereby the time difference between the pulsed repetitive code output of the second generating means and the pulsed repetitive code output from the receiver mixer is reduced to a minimum by inhibit signals to the first and the second gating means for allowing a moving target to be tracked as its range to a radar location increases and decreases.
Claim 3
Dependent Claim
60 words
The portable attack warning radar range tracking system of claim 1 wherein said code decorrelator means comprises: a first decorrelator directly coupled to said second generating means; a second decorrelator coupled via a first delay means to said second generating means; a third decorrelator coupled via said first delay means and a second delay means to said second generating means.
Claim 4
Dependent Claim
62 words
A portable attack warning radar range tracking system of claim 1 wherein said inhibit pulse generating means comprises: first detector for supplying an output whenever an output voltage from said summing means exceeds a predetermined magnitude of positive voltage level; second detector for supplying an output whenever an output voltage from said summing means exceeds a predetermined magnitude of negative voltage level.
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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |