US4232315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Range detector
Assignee: Motorola Solutions Inc
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Filing: 1966-11-08
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Granted: 1980-11-04
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Expires: 1986-11-08
Abstract
Abstract A doppler range detector with early and late range gates responding to radar returns or either side of maximum velocity range and supplying a peak output amplitude when the early and late gates have the same doppler frequency. A peak detector is used to detect slant range with a dual pulse ranging system. The returns are supplied to two zero beat mixers, the output signals of which are passed through separate bandpass filters to a multiplier. The multiplier output is supplied through a low pass filter to the peak detector.
Inventors
- 👤 Neil C. Kern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:46
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/06; G01S13/08; G01S13/10; G01S13/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
294 words
A range determining system including in combination, transmitter means for producing pulses of high frequency oscillations and including antenna means for radiating and receiving said pulses, means coupled to said antenna for selecting said pulses after reflection with the reflected pulses having Doppler frequency components produced by relative movement between said antenna means and the reflecting object, first mixer means for reducing the frequency of the oscillations of the received pulses, second mixer means coupled to said transmitter means for reducing the frequency of the oscillations of the transmitted pulses, first delay means connected to said second mixer means, a first zero beat mixer having inputs connected to said first mixer means and to said first delay means for deriving the Doppler frequency components from reflected pulses which have a delay corresponding to the delay of said first delay means, second delay means connected to said first delay means, a second zero beat mixer having inputs connected to said first mixer means and to said second delay means for deriving the Doppler frequency components from reflected pulses which have a delay corresponding to the sum of the delays of said first and second delay means, first and second bandpass filter means each including limiter means for providing gain control and connected to the outputs of said first and second zero beat mixers respectively for selecting the Doppler frequency components within a given band, multiplier means connected to said first and second filter means for multiplying the signals therefrom, low pass filter means connected to said multiplier means for selecting signals below a given frequency, and peak detector means connected to said low pass filter for producing an indication when the signals from said first and second bandpass filter means are of the same frequency.
Claim 2
Dependent Claim
294 words
A range determining system including in combination, transmitter means for producing pulses of high frequency oscillations and including antenna means for radiating and receiving said pulses, means coupled to said antenna for selecting said pulses after reflection with the reflected pulses having Doppler frequency components produced by relative movement between said antenna means and the reflecting object, first mixer means for reducing the frequency of the oscillations of the received pulses, second mixer means coupled to said transmitter means for reducing the frequency of the oscillations of the transmitted pulses, first delay means connected to said second mixer means, a first zero beat mixer having inputs connected to said first mixer means and to said first delay means for deriving the Doppler frequency components from reflected pulses which have a delay corresponding to the delay of said first delay means, second delay means connected to said first delay means, a second zero beat mixer having inputs connected to said first mixer means and to said second delay means for deriving the Doppler frequency components from reflected pulses which have a delay corresponding to the sum of the delays of said first and second delay means, first and second bandpass filter means each including limiter means for providing gain control and connected to the outputs of said first and second zero beat mixers respectively for selecting the Doppler frequency components within a given band, multiplier means connected to said first and second filter means for multiplying the signals therefrom, low pass filter means connected to said multiplier means for selecting signals below a given frequency, and peak detector means connected to said low pass filter for producing an indication when the signals from said first and second bandpass filter means are of the same frequency.
Claim 3
Dependent Claim
27 words
The range determining system of claim 1 including a single local oscillator, and means applying signals from said local oscillator to said first and second mixer means.
Claim 4
Dependent Claim
37 words
The range determining system of claim 1 including a first amplifier connecting said first delay means to said first zero beat mixer and a second amplifier connecting said second delay means to said second zero beat mixer.
Claim 5
Dependent Claim
30 words
The range determining system of claim 1 wherein said first and second bandpass filter means each includes a low pass filter, an amplifier and limiter, and a high pass filter.
Claim 6
Dependent Claim
31 words
The range determining system of claim 1 wherein said first delay means is selected to produce a predetermined delay to provide an indication of a particular range associated with such delay.
Claim 7
Dependent Claim
28 words
The range determining system of claim 1 wherein said second delay means produces a delay equal to twice the length of the pulses transmitted by said transmitter means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |