US3216013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse compression radar system utilizing logarithmic phase modulation
Assignee: General Electric Co
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Filing: 1961-10-23
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Granted: 1965-11-02
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Expires: 1981-10-23
Abstract
No abstract record available.
Inventors
- 👤 Robert C Thor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:58
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/10; G01S13/26; G01S13/28; G01S13/282
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A RADIO COMMUNICATION SYSTEM UTILIZING LOGARITHMIC PHASE MODULATION TO PROVIDE SUBSTANTIAL INSENSITIVITY TO LARDE DOPPLER FREQUENCY SHIFTS: (A) A SOURCE OF RADIO FREQUENCY INFORMATION SIGNALS COMPRISING PULSES HAVING A SINUSOIDAL WAVEFORM; (B) A FIRST FILTER CIRCUIT COUPLED TO SAID SOURCE HAVING A TIME DELAY RESPONSE CHARACTERISTIC TO SAID INFORMATION SIGNAL WHICH PRODUCES AN EXPANDED PULSE HAVING A PHASE SPECTRUM THAT IS AN APPROXIMATELY LOGARITHMIC FUNCTION OF FREQUENCY; (C) A TRANSMITTER, COUPLED TO SAID FIRST FILTER CIRCUIT FOR PROVIDING AN APPROXIMATELY LOGARITHMIC PHASE FUNCTION, FOR TRANSMITTING THE PULSES; (D) A RECEIVER RESPONSIVE TO THE TRANSMITTED PULSES, AND (E) A SECOND FILTER CIRCUIT COUPLED TO SAID RECEIVER HAVING A TIME DELAY RESPONSE CHARACTERISTIC WHICH IS MATCHED TO THE FIRST FILTER CHARACTERISTIC TO COMPRES THE RECEIVED PULSES WHEREBY THE RECEIVER IS SUBSTANTIALLY INSENSITIVE TO LARGE DOPPLER FREQUENCY SHIFTS.
Claim 2
Dependent Claim
135 words
A RADIO COMMUNICATION SYSTEM UTILIZING LOGARITHMIC PHASE MODULATION TO PROVIDE SUBSTANTIAL INSENSITIVITY TO LARDE DOPPLER FREQUENCY SHIFTS: (A) A SOURCE OF RADIO FREQUENCY INFORMATION SIGNALS COMPRISING PULSES HAVING A SINUSOIDAL WAVEFORM; (B) A FIRST FILTER CIRCUIT COUPLED TO SAID SOURCE HAVING A TIME DELAY RESPONSE CHARACTERISTIC TO SAID INFORMATION SIGNAL WHICH PRODUCES AN EXPANDED PULSE HAVING A PHASE SPECTRUM THAT IS AN APPROXIMATELY LOGARITHMIC FUNCTION OF FREQUENCY; (C) A TRANSMITTER, COUPLED TO SAID FIRST FILTER CIRCUIT FOR PROVIDING AN APPROXIMATELY LOGARITHMIC PHASE FUNCTION, FOR TRANSMITTING THE PULSES; (D) A RECEIVER RESPONSIVE TO THE TRANSMITTED PULSES, AND (E) A SECOND FILTER CIRCUIT COUPLED TO SAID RECEIVER HAVING A TIME DELAY RESPONSE CHARACTERISTIC WHICH IS MATCHED TO THE FIRST FILTER CHARACTERISTIC TO COMPRES THE RECEIVED PULSES WHEREBY THE RECEIVER IS SUBSTANTIALLY INSENSITIVE TO LARGE DOPPLER FREQUENCY SHIFTS.
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |