US3660844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radar detector and identifier
Assignee: Sierra Research Corp
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Filing: 1970-05-04
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Granted: 1972-05-02
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Expires: 1990-05-04
Abstract
Abstract A radar detector and identifier device described with reference to an illustrative embodiment wherein the device is carried and used by persons, such as military personnel, to warn them when they are being illuminated by radar, to provide such persons with the capability of roughly determing the direction from which the radar illumination is coming, and especially to provide them with the capability of identifying the radar signal as originating from an enemy or a friendly source by identifying certain characteristics of the radar signal itself such as its pulse repetition frequency and its pulse width, the device also being operative to recognize CW signals.
Inventors
- 👤 Basil E Potter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:14
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/021; G01S7/36
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
168 words
A device for detecting the presence of radar signals and identifying the type of radar emitting them by indicating pulse repetition frequency (PRF) and pulse width of the signals, comprising: a. means for receiving and detecting said signals to obtain corresponding video signals; b. PRF determining means including means for delivering standardized increments in response to detected video signals and including first integrating means responsive to said delivered increments to deliver a first analog level proportional to the radar signal PRF; c. pulse width determining means including second integrating means responsive to the detected video signals to deliver an integrated level proportional to the duty cycle of said video signals, and including operational amplifier means for amplifying said integrated duty-cycle level, and the amplifier means having gain control means coupled to be inversely controlled by said first analog level to deliver from the amplifier means a second analog level proportional to pulse width of the radar signal; and d. means for indicating said first and second analog levels.
Claim 2
Independent Claim
168 words
A device for detecting the presence of radar signals and identifying the type of radar emitting them by indicating pulse repetition frequency (PRF) and pulse width of the signals, comprising: a. means for receiving and detecting said signals to obtain corresponding video signals; b. PRF determining means including means for delivering standardized increments in response to detected video signals and including first integrating means responsive to said delivered increments to deliver a first analog level proportional to the radar signal PRF; c. pulse width determining means including second integrating means responsive to the detected video signals to deliver an integrated level proportional to the duty cycle of said video signals, and including operational amplifier means for amplifying said integrated duty-cycle level, and the amplifier means having gain control means coupled to be inversely controlled by said first analog level to deliver from the amplifier means a second analog level proportional to pulse width of the radar signal; and d. means for indicating said first and second analog levels.
Claim 3
Dependent Claim
104 words
In a device as set forth in claim 1, free-running oscillator means for generating timing pulses; gate means controlled by said timing pulses and connected to accept said detected video signals and deliver a train of them when enabled by the timing pulses to said means for delivering standardized increments to said first integrating means; sample-and-hold means actuated by said timing pulses to sample-and-hold the output level of the first integrating means when said train of video pulses has been delivered; and means responsive to said timing pulses for dumping the content of the first integrating means after the sample-and-hold means has been actuated.
Claim 4
Dependent Claim
34 words
In a device as set forth in claim 2, said means for delivering standardized increments comprising a one-shot responsive to said video signals to generate and deliver discrete pulses of standardized width and height.
Claim 5
Dependent Claim
84 words
In a device as set forth in claim 2, said gate means being connected to accept said detected video signals and deliver a train of them when enabled by the timing pulses to said means for determining pulse width; means in the second integrating means for integrating the video signals in each train to obtain said integrated level proportional to duty cycle; and means responsive to said timing pulses for dumping the content of the second integrating means after said integrated level is reached.
Claim 6
Dependent Claim
102 words
In a device as set forth in claim 1, free-running oscillator means for generating timing pulses; gate means controlled by said timing pulses and connected to accept said detected video signals and deliver a train of them when enabled by the timing pulses to said means for determining PRF and to said means for determining pulse width; means in the second integrating means for integrating the video signals in each train to obtain said integrated level proportional to duty cycle; and means responsive to said timing pulses for dumping the content of the both integrating means after said integrated level is reached.
Claim 7
Dependent Claim
59 words
In a system as set forth in claim 5, means for coupling said timing pulses to said radar signal receiving means and operative in response thereto to periodically chop the response thereof whereby one wide video pulse comprises the video signal train which is delivered to said gate means when said radar signals are of the continuous wave type.
Claim 8
Dependent Claim
69 words
In a system as set forth in claim 1, AGC amplifier means coupling the detected video signals to said PRF and pulse width determining means; a gated audio tone generator; transducer means for making its tone audible; and means for coupling the AGC level of the amplifier means to said gated tone generator to render it operative only when the AGC level indicates the reception of a radar signal.
Claim 9
Dependent Claim
52 words
In a system as set forth in claim 7, said tone generator having a voltage controllable pitch; and integrator means for integrating detected video signals to obtain a voltage proportional to their strength, the voltage being coupled to said tone generator to control its pitch as an indication of received signal strength.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |