US4837574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Near-field monostatic intrusion detection system
Assignee: Boeing Co
•
Filing: 1987-04-17
•
Granted: 1989-06-06
•
Expires: 2007-04-17
Abstract
Abstract The invention comprises a plurality of monostatic devices for radiating and receiving signals. The monostatic devices are disposed in a vertical spaced relationship such that signals from each device follow a direct path to an object to be detected and a reflected path to the object to be detected. The reflected path includes a path to a surface below the object and a path from the surface to the object. The signals are then reflected from the object and return through both the direct and reflected path. The monostatic devices may be radar antennas or acoustic transmitters.
Inventors
- 👤 Robert V. Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:45
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/02; G01S15/04; G01S13/00; G01S13/02; G01S13/04; G01S15/87; G08; G08B; G08B13/00; G08B13/22; G08B13/24; G08B13/2491
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
141 words
A near-field object-detection system, comprising: a plurality of monostatic transducers for radiating and receiving direct and reflected non-parallel signals in a near field, said monostatic transducers being disposed in a vertically-spaced relationship such that signals from each said monostatic transducer follow a direct path to an object to be detected and a reflected path to said object to be detected, said reflected path including a path to a surface below said object and a path from said surface to said object; and means for receiving signals from each of said monostatic devices and identifying objects in said near field therefrom; wherein the heights of said monostatic devices are such that constructive interference occurs between the direct path signal and the reflected path signal of each said device, said constructive interference occurring at a different distance for each of said monostatic devices.
Claim 2
Dependent Claim
141 words
A near-field object-detection system, comprising: a plurality of monostatic transducers for radiating and receiving direct and reflected non-parallel signals in a near field, said monostatic transducers being disposed in a vertically-spaced relationship such that signals from each said monostatic transducer follow a direct path to an object to be detected and a reflected path to said object to be detected, said reflected path including a path to a surface below said object and a path from said surface to said object; and means for receiving signals from each of said monostatic devices and identifying objects in said near field therefrom; wherein the heights of said monostatic devices are such that constructive interference occurs between the direct path signal and the reflected path signal of each said device, said constructive interference occurring at a different distance for each of said monostatic devices.
Claim 3
Dependent Claim
152 words
A near-field object-detection system, comprising: a plurality of monostatic devices for radiating and receiving signals in a near field, said monostatic devices being disposed in a vertically-spaced relationship such that signals from each of said monostatic devices follow a direct path to an object to be detected and a reflected path to said object to be detected, said reflected path including a path to a surface below said object and a path from said surface to said object; means for receiving signals from each of said monostatic devices and identifying objects in said near field therefrom; and means for providing a unique phase shift to signals of each said monostatic devices; wherein the heights of said monostatic devices are such that constructive interference occurs between the direct path signal and the reflected path signal of each said device, said constructive interference occurring at a different distance for each of said monostatic devices.
Claim 4
Dependent Claim
152 words
A near-field object-detection system, comprising: a plurality of monostatic devices for radiating and receiving signals in a near field, said monostatic devices being disposed in a vertically-spaced relationship such that signals from each of said monostatic devices follow a direct path to an object to be detected and a reflected path to said object to be detected, said reflected path including a path to a surface below said object and a path from said surface to said object; means for receiving signals from each of said monostatic devices and identifying objects in said near field therefrom; and means for providing a unique phase shift to signals of each said monostatic devices; wherein the heights of said monostatic devices are such that constructive interference occurs between the direct path signal and the reflected path signal of each said device, said constructive interference occurring at a different distance for each of said monostatic devices.
Claim 5
Dependent Claim
111 words
A near-field object-detection system, comprising: a plurality of monostatic devices for radiating and receiving signals in a near field, said monostatic devices being disposed in a vertically-spaced relationship such that signals from each of said monostatic devices follow a direct path to an object to be detected and a reflected path to said object to be detected, said reflected path including a path to a surface below said object and a path from said surface to said object; means for receiving signals from each of said monostatic devices and identifying objects in said near field therefrom; and means for providing a unique time delay to signals of each said monostatic devices.
Claim 6
Dependent Claim
111 words
A near-field object-detection system, comprising: a plurality of monostatic devices for radiating and receiving signals in a near field, said monostatic devices being disposed in a vertically-spaced relationship such that signals from each of said monostatic devices follow a direct path to an object to be detected and a reflected path to said object to be detected, said reflected path including a path to a surface below said object and a path from said surface to said object; means for receiving signals from each of said monostatic devices and identifying objects in said near field therefrom; and means for providing a unique time delay to signals of each said monostatic devices.
Claim 7
Dependent Claim
25 words
A near-field object-detection system as claimed in claim 2 including means for providing an individual weighting function to signals of each of said monostatic devices.
Claim 8
Dependent Claim
16 words
A near-field object-detection system as claimed in claim 2 wherein said monostatic devices are radar antennas.
Claim 9
Dependent Claim
30 words
A near-field object-detection system according to claim 2 wherein the height of the highest monostatic device is such as to provide constructive interference at the greatest range of said system.
Claim 10
Dependent Claim
33 words
A near-field object-detection system according to claim 6 wherein the height of the monostatic device having the lowest height is such as to provide constructive interference at the closest range of said system.
Claim 11
Dependent Claim
39 words
A near-field object-detection system according to claim 2 wherein said monostatic devices are positioned at various heights such that patterns of constructive and destructive interference between the closest range of said system and the greatest range of said system.
Claim 12
Dependent Claim
16 words
A near-field object-detection system according to claim 2 including means for providing a range gating function.
Claim 13
Independent Claim
137 words
A method of near-field object-detection comprising: causing a plurality of vertically-spaced monostatic devices to radiate direct and reflected non-parallel signals such that signals from each said monostatic device follow a direct path to an object to be detected and a reflected path to said object to be detected, said reflected path including a path to a surface below said object and a path from said surface to said object and positioning said monostatic devices at heights such that constructive interference occurs from signals from each said device following said direct and reflected paths, said constructive interference occurring at a different distance for each said device; receiving reflected signals from said object by end of said monostatic devices through both said direct and said reflected paths; and identifying signals radiated and received by each of said monostatic devices.
Claim 14
Independent Claim
137 words
A method of near-field object-detection comprising: causing a plurality of vertically-spaced monostatic devices to radiate direct and reflected non-parallel signals such that signals from each said monostatic device follow a direct path to an object to be detected and a reflected path to said object to be detected, said reflected path including a path to a surface below said object and a path from said surface to said object and positioning said monostatic devices at heights such that constructive interference occurs from signals from each said device following said direct and reflected paths, said constructive interference occurring at a different distance for each said device; receiving reflected signals from said object by end of said monostatic devices through both said direct and said reflected paths; and identifying signals radiated and received by each of said monostatic devices.
Claim 15
Independent Claim
147 words
A method of near-field object-detection comprising: causing a plurality of vertically-spaced monostatic devices to radiate signals such that signals from each said monostatic device follow a direct path to an object to be detected and a reflected path to said object to be detected, said reflected path including a path to a surface below said object and a path from said surface to said object and positioning said monostatic devices at heights such that constructive interference occurs from signals from each said device following said direct and reflected paths, said constructive interference occurring at a different distance for each said device; receiving reflected signals from said object by each of said monostatic devices through both said direct and said reflected paths; and identifying signals radiated and received by each of said monostatic devices; and providing a unique phse shift to signals of each of said monostatic devices.
Claim 16
Independent Claim
147 words
A method of near-field object-detection comprising: causing a plurality of vertically-spaced monostatic devices to radiate signals such that signals from each said monostatic device follow a direct path to an object to be detected and a reflected path to said object to be detected, said reflected path including a path to a surface below said object and a path from said surface to said object and positioning said monostatic devices at heights such that constructive interference occurs from signals from each said device following said direct and reflected paths, said constructive interference occurring at a different distance for each said device; receiving reflected signals from said object by each of said monostatic devices through both said direct and said reflected paths; and identifying signals radiated and received by each of said monostatic devices; and providing a unique phse shift to signals of each of said monostatic devices.
Claim 17
Independent Claim
112 words
A method of near-field object-detection comprising: causing a plurality of vertically-spaced monostatic devices to radiate signals such that signals from each of said monostatic device follow a direct path to an object to be detected and a reflected path to said object to be detected, said reflected path including a path to a surface below said object and a path from said surface to said object; receiving reflected signal from said object by each of said monostatic devices through both said direct and said reflected paths; and identifying signals radiated and received by each of said monostatic devices; and providing a unique time delay to signals of each of said monostatic devices.
Claim 18
Independent Claim
112 words
A method of near-field object-detection comprising: causing a plurality of vertically-spaced monostatic devices to radiate signals such that signals from each of said monostatic device follow a direct path to an object to be detected and a reflected path to said object to be detected, said reflected path including a path to a surface below said object and a path from said surface to said object; receiving reflected signal from said object by each of said monostatic devices through both said direct and said reflected paths; and identifying signals radiated and received by each of said monostatic devices; and providing a unique time delay to signals of each of said monostatic devices.
Claim 19
Dependent Claim
18 words
A method according to claim 11 including providing an individual weighting function to signals of each said device.
Claim 20
Dependent Claim
13 words
A method according to claim 11 wherein said monostatic devices are radar antennas.
Claim 21
Dependent Claim
27 words
A method according to claim 11 wherein the highest monostatic device is positioned at a height to provide constructive interference at the greatest range of said system.
Claim 22
Dependent Claim
27 words
A method according to claim 15 wherein the lowest monostatic device is positioned at a height to provide constructive interference at the closest range of said system.
Claim 23
Dependent Claim
37 words
A method according to claim 10 wherein said monostatic devices are positioned at heights such that patterns of constructive and destructive interference occur between the closest range of the system and the greatest range of the system.
Claim 24
Dependent Claim
18 words
A method according to claim 10 including providing a range gating function for said radiated and received signals.
Claim 25
Dependent Claim
24 words
A near-field object-detection system as claimed in claim 3 including means for providing an individual weighting function to signals of each said monostatic devices.
Claim 26
Dependent Claim
52 words
A near-field object-detection system as claimed in claim 3 wherein the heights of said monostatic devices are such that constructive interference occurs between the direct path signal and the reflected path signal of each of said monostatic devices, said constructive interference occurring at a different distance for each of said monostatic devices.
Claim 27
Dependent Claim
16 words
A near-field object-deviation system as claimed in claim 3 wherein said monostatic devices are radar antennas.
Claim 28
Dependent Claim
30 words
A near-field object-detection system according to claim 20 wherein the height of the highest monostatic device is such as to provide constructive interference at the greatest range of said system.
Claim 29
Dependent Claim
33 words
A near-field object-detection system according to claim 22 wherein the height of the monostatic device having the lowest height is such as to provide constructive interference at the closest range of said system.
Claim 30
Dependent Claim
38 words
A near-field object-detection system according to claim 3 wherein said monostatic devices are positioned at heights such that patterns of constructive and destructive interference between the closest range of said system and the greatest range of said system.
Claim 31
Dependent Claim
16 words
A near-field object-detection system according to claim 3 including means for providing a range gating function.
Claim 32
Dependent Claim
18 words
A method according to claim 12 including providing an individual weighting function to signals of each said device.
Claim 33
Dependent Claim
42 words
A method according to claim 12 including positioning said monostatic devices at heights such that constructive interference occurs for signals from each said device following said direct and reflected paths, said constructive interference occurring at a different distance for each said device.
Claim 34
Dependent Claim
13 words
A method according to claim 12 wherein said monostatic devices are radar antennas.
Claim 35
Dependent Claim
27 words
A method according to claim 27 wherein the highest monostatic device is positioned at a height to provide constructive interference at the greatest range of said system.
Claim 36
Dependent Claim
27 words
A method according to claim 29 wherein the lowest monostatic device is positioned at a height to provide constructive interference at the closest range of said system.
Claim 37
Dependent Claim
37 words
A method according to claim 12 wherein said monostatic devices are positioned at heights such that patterns of constructive and destructive interference occur between the closest range of the system and the greatest range of the system.
Claim 38
Dependent Claim
18 words
A method according to claim 12 including providing a range gating function for said radiated and received signals.
References Cited (Backward Citations)
US3255450A
Cited
US3154783A
Cited
US3394374A
Cited
US3273151A
Cited
US3163861A
Cited
US3300768A
Cited
US3394342A
Cited
US3295134A
Cited
US3448450A
Cited
US3806930A
Cited
US3691558A
Cited
US3854132A
Cited
US3890615A
Cited
US3825928A
Cited
US3877002A
Cited
US4051472A
Cited
US3911364A
Cited
US4191953A
Cited
US4213126A
Cited
US4287579A
Cited
US4217592A
Cited
US4316191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |