US3587097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal retrieval system with continuous control of detection threshold level
Assignee: Westinghouse Electric Corp
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Filing: 1966-12-05
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Granted: 1971-06-22
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Expires: 1986-12-05
Abstract
Abstract This invention provides a special spectrum analyzer especially adapted to be used in connection with a Doppler radar system. The analyzer comprises a bank of contiguous filters connected to the radar receiver which are utilized to discriminate between targets having different Doppler frequency shifts. The output of each filter is amplified, detected, and integrated. The various integrator voltages are then compared to a reference voltage which helps eliminate error due to noise, to determine if a target is present.
Inventors
- 👤 Keefer S Stull Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:35
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/58; G01S13/585; G01R; G01R23/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
156 words
Signal data retrieval apparatus for receiving signal data dispersed in a wide spectrum of frequencies including pulses and coherent and noncoherent frequencies of random phase and amplitude comprising, a receiver for receiving a wide spectrum of input signals including the desired signal spectrum and noise signals, a plurality of contiguous signal filter channels connected to said receiver, each channel having detector and postdetector integrator means and covering a desired signal band so that they separate the signal spectrum into discrete quantized segments, a plurality of reference voltage channels connected to said receiver and spaced from said signal channels and each including filter, amplifier, detector and postdetector integrator means, means for summing the instantaneous output voltages from said reference channels, a threshold detector, and means for supplying said signals from said channels to said threshold detector for causing a final output signal when the sum of the output signal voltages exceeds the sum of the reference voltages.
Claim 2
Dependent Claim
156 words
Signal data retrieval apparatus for receiving signal data dispersed in a wide spectrum of frequencies including pulses and coherent and noncoherent frequencies of random phase and amplitude comprising, a receiver for receiving a wide spectrum of input signals including the desired signal spectrum and noise signals, a plurality of contiguous signal filter channels connected to said receiver, each channel having detector and postdetector integrator means and covering a desired signal band so that they separate the signal spectrum into discrete quantized segments, a plurality of reference voltage channels connected to said receiver and spaced from said signal channels and each including filter, amplifier, detector and postdetector integrator means, means for summing the instantaneous output voltages from said reference channels, a threshold detector, and means for supplying said signals from said channels to said threshold detector for causing a final output signal when the sum of the output signal voltages exceeds the sum of the reference voltages.
Claim 3
Dependent Claim
74 words
The combination as set forth in claim 1 in which the bandwidth of said reference channels is equal to T2 X BS, where T is equal to the ratio of the output voltages of said reference channels to the output voltage of said signal channels in random noise environment and BS is the bandwidth of the signal channels, and the gain of said signal channels is equal to the gain of said reference channels.
Claim 4
Dependent Claim
48 words
The combination as set forth in claim 1 in which the output signal voltages from said signal channels are connected to said threshold detector as signal inputs and the outputs from said reference channels are connected to said threshold detector to apply a threshold bias to said detector.
Claim 5
Dependent Claim
44 words
The combination as set forth in claim 3 in which the bandwidth of said reference channels is a selected amount greater than the bandwidth of said signal channels, and the gain of said signal channel is equal to the gain of said reference channels.
Claim 6
Dependent Claim
99 words
The combination as set forth in claim 3 in which each reference channel includes an attenuating resistor, all of equal value, said resistors being connected to a common output terminal constituting a summing point, the gain of said signal channels being the same as that of said reference channels and the bandwidth of said reference channels being equal to the product of the threshold ratio squared times the bandwidth of said signal channels, the threshold ratio being the ratio of the sum of the output voltages of the reference channels to the output signal voltages of the signal channels.
Claim 7
Dependent Claim
19 words
The combination as set forth in claim 5, and an integrator connected between said filter and said threshold detector.
Claim 8
Dependent Claim
137 words
The combination as set forth in claim 3 wherein there are two groups of reference channels, all of said channels of each group having the same bandwidth, the bandwidth of one group being much wider than the bandwidth of the other group, a summation network for each network including an attenuating resistor for each channel of the respective group so that the noise voltage output of each summing network will be reduced by a factor of 1/ N where N is the number of channels in the Respective group, the gain of said signal channels being equal to the gain of the reference channels, a low impedance output circuit for each network, a potential divider connected between said circuits, and means for supplying an output potential from said potentiometer to said threshold detector to bias the latter.
Claim 9
Dependent Claim
24 words
The combination as set forth in claim 7 in which there is a low pass filter connected between said potentiometer and said threshold detector.
Claim 10
Dependent Claim
72 words
The combination as set forth in claim 7, the relation of the bandwidths of the reference channels to the signal channels is BRW T2max. BSBRW T2min. BS where BRW is the bandwidth of the wide reference channels, BRN is the bandwidth of the narrow reference channels, Tmax and Tmin are the threshold ratios for maximum the wide and narrow band reference channels, respectively, and BS is the bandwidth of the signal channels.
Claim 11
Dependent Claim
26 words
The combination as set forth in claim 3 in which the bandwidth of said reference channels is much greater than the bandwidth of said signal channels.
Claim 12
Dependent Claim
36 words
The combination as set forth in claim 10, and a low pass filter having a bandwidth equal to one half of the bandwidth of said signal channels connected between said summing point and said threshold detector.
Claim 13
Dependent Claim
21 words
The combination as set forth in claim 11, including an integrator connected between said low pass filter and said threshold detector.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |