Patent US3790926A successfully refreshed from Google Patents.
US3790926A
Expired / Lapsed
US
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Method for determining the speed of a vehicle
Assignee: Siemens AG
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Filing: 1972-06-13
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Granted: 1974-02-05
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Expires: 1992-06-13
Abstract
Abstract A method of determining the speed of vehicle, particularly a ship by the transmission of coherent waves, with echo signals being received at a plurality of points along a receiving line extending parallel to the azimuth direction, with both phase and amplitude information of the received echo signals being recorded as a function of the receiving time, while applying a reference signal, thereby forming one-dimensional holograms, employing an impulse repetition having a time interval T between successive impulses such that the distance d, traveled by the vehicle within the time interval T is less than one-half of the overall distance between the first and last of said receiving points, (defining the length L of the receiving line), i.e. d< L/2 in which a cross correlation function of the one-dimensional holograms of an impulse and the following impulse is formed, whereby the vehicle speed may be calculated from the positions of the correlation maximums.
Inventors
- 👤 D Pekau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:07
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/02; G01S15/50; G01S15/58; G01S15/60; G01S13/00; G01S13/02; G01S13/50; G01S13/58; G01S13/585; G01S13/587; G01S15/88; G01S15/89; G01S15/8902
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
169 words
A method of determining the speed of a vehicle, particularly a ship, by the transmission of coherent waves, with echo signals thereof being received at a plurality of points along a receiving line extending parallel to the azimuth direction, with both phase and amplitude information of the received echo signals being recorded as a function of the receiving time, while applying a reference signal, thereby forming one dimensional holograms, comprIsing the steps of effecting transmission of said coherent waves as a plurality of sequential impulses having a time interval T between successive impulses, employing an impulse repetition frequency such that the distance d, traveled by the vehicle within the time interval T is less than one-half of the overall distance between the first and last of said receiving points (defining the length L of the receiving line), i.e. d<L/2, and forming a cross correlation function of the one-dimensional holograms of an impulse and the following impulse, whereby the positions of the correlation maximums are representative of the vehicle speed.
Claim 2
Independent Claim
169 words
A method of determining the speed of a vehicle, particularly a ship, by the transmission of coherent waves, with echo signals thereof being received at a plurality of points along a receiving line extending parallel to the azimuth direction, with both phase and amplitude information of the received echo signals being recorded as a function of the receiving time, while applying a reference signal, thereby forming one dimensional holograms, comprIsing the steps of effecting transmission of said coherent waves as a plurality of sequential impulses having a time interval T between successive impulses, employing an impulse repetition frequency such that the distance d, traveled by the vehicle within the time interval T is less than one-half of the overall distance between the first and last of said receiving points (defining the length L of the receiving line), i.e. d<L/2, and forming a cross correlation function of the one-dimensional holograms of an impulse and the following impulse, whereby the positions of the correlation maximums are representative of the vehicle speed.
Claim 3
Dependent Claim
27 words
A method according to claim 1, comprising supplying the reference signal, in the form of a signal coherent with the transmitted waves, to each received echo signal.
Claim 4
Dependent Claim
86 words
A method according to claim 1, comprising the steps of superimposing the respective received echo signals and such reference signal, applying the superimposed signal to a line of controllable light sources for energizing the light sources, recording the energized states of the light sources on a light-sensitive material, moving the light-sensitive material along first and second coordinates at a speed in the first, azimuth direction proportional to the speed of the vehicle, and at a speed in the second direction which is constant during echo reception.
Claim 5
Dependent Claim
36 words
A method according to claim 3, comprising the step of returning the light-sensitive material to its original position with respect to movement in the second direction before reception of the first echo of the next impulse.
Claim 6
Dependent Claim
16 words
A method according to claim 3, wherein the step of recording comprises recording on photochromic material.
Claim 7
Dependent Claim
16 words
A method according to claim 3, wherein the step of recording comprises recording on photographic material.
Claim 8
Dependent Claim
26 words
A method according to claim 1, wherein the cross correlation of the holograms is effected by coherent optical one-dimensional adapted filtering, parallel to the azimuth direction.
Claim 9
Dependent Claim
60 words
A method according to claim 7, comprising the steps of converting the echo signals of an impulse to optical signals, said recording step comprising recording on a recording medium, such optical signals, with such signals comprising the amplitude transmission f1(x, t), to produce a one-dimensional adapted filter, and filtering therewith the series of subholograms f2(x, t) of the next impulse.
Claim 10
Dependent Claim
143 words
A method according to claim 8 comprising the step of impacting said filter, depicting the amplitude transmission f1(x, t), with a laser beam, passing the filtered beam through spherical and cylindrical lenses to produce a one-dimensional Fourier transform F1(u, t), recording such transform on a photomedium, developing the photomedium, returning the same to its original position, substituting for the filter depicting the amplitude transmission f1(x, t), a filter depicting the amplitude transmission f2(x, t) of the next impulse, impacting said last-mentioned filter with such laser beam to produce a one-dimensional Fourier transform F2(u, t) which traverses said photomedium and thereafter passing the traversing beam through a cylindrical lens, and a spherical lens to record the t coordinate of the filter plane in the focal plane of the spherical lens and produce the one-dimensional cross correlation of the holograms f1(x, t) and f2(x, t).
Claim 11
Dependent Claim
42 words
A method according to claim 7, comprising the steps of effecting an electro-optical conversion in the formation of the one-dimensional holograms of an impulse, and effecting a direct amplitude or phase modulation of a laser beam in correspondence to the electrical signals.
Claim 12
Dependent Claim
17 words
A method according to claim 10, comprising effecting the electro-optical conversion with a liquid crystal picture screen.
Claim 13
Dependent Claim
16 words
A method according to claim 10, comprising effecting the electro-optical conversion wIth a thermo-plastic picture screen.
Claim 14
Dependent Claim
15 words
A method according to claim 10, comprising effecting the electro-optical conversion with a ''''Titus tube.''''
Claim 15
Dependent Claim
23 words
A method according to claim 7, wherein a reversible photochromic or thermo-plastic material is utilized in the electro-optical conversion as an adapted filter.
Claim 16
Dependent Claim
30 words
A method according to claim 1, wherein only the echo signals of the first and last receiving points of the line are utilized in the forming of the cross-correlation function.
Claim 17
Dependent Claim
40 words
A method according to claim 1, wherein the output signal at the respective receiving points are supplied to an electronic computer for deriving the cross correlation function of the one-dimensional holograms of an impulse and those of the following impulse.
Claim 18
Dependent Claim
15 words
A method according to claim 1, wherein the transmitted and received waves comprise ultrasonic waves.
References Cited (Backward Citations)
US3066279A
Cited
US3631384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |