GB1468159A - Radar speed measuring systems - Google Patents
Radar speed measuring systemsInfo
- Publication number
- GB1468159A GB1468159A GB3463773A GB3463773A GB1468159A GB 1468159 A GB1468159 A GB 1468159A GB 3463773 A GB3463773 A GB 3463773A GB 3463773 A GB3463773 A GB 3463773A GB 1468159 A GB1468159 A GB 1468159A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- signal
- filter
- fed
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
- G01S13/60—Velocity or trajectory determination systems; Sense-of-movement determination systems wherein the transmitter and receiver are mounted on the moving object, e.g. for determining ground speed, drift angle, ground track
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
1468159 Radar BRITISH RAILWAYS BOARD 19 July 1974 [20 July 1973] 34637/73 Heading H4D In a train- or other vehicle-mounted radar speed measuring system there are included aerial means for directing a radio beam to the ground and for receiving waves reflected therefrom, means for producing an A.C. signal whose frequency band corresponds to the Doppler frequency band, and means for processing the A.C. signal to produce a speed measurement output. A high-pass filter is connected between the A.C. signal producing and processing means and is continuously adjusted via a control circuit in a feedback path from its output so that its cut-off frequency always substantially corresponds to the frequency of the component of the A.C. signal having the maximum amplitude. As shown in Fig. 1, the Doppler input is fed via a filter 1 to a zero crossing detector 2, which produces a rectangular pulse train. This is fed to a line driver 3, which is connected to indicating and counting equipment providing a speed measurement. Output from the detector 2 is also fed to a frequency to voltage converter 4, which may be of diode-transistor pump type, and which provides a control voltage V for the filter 1, via shaping circuits 5. The filter comprises an operational amplifier OA1, Fig. 2, and a matched pair of field effect transistors Q1, Q2 whose resistance is adjusted continuously by the control voltage V so that the cut-off frequency corresponds closely to the frequency of maximum amplitude. Hence, unwanted lower frequency components are largely eliminated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3463773A GB1468159A (en) | 1974-07-19 | 1974-07-19 | Radar speed measuring systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3463773A GB1468159A (en) | 1974-07-19 | 1974-07-19 | Radar speed measuring systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1468159A true GB1468159A (en) | 1977-03-23 |
Family
ID=10368124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3463773A Expired GB1468159A (en) | 1974-07-19 | 1974-07-19 | Radar speed measuring systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1468159A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1980001418A1 (en) * | 1978-12-28 | 1980-07-10 | Fritzlen M | Radar speedometer |
| GB2144599A (en) * | 1983-07-20 | 1985-03-06 | Plessey Co Plc | Distinguishing different types of movement |
| US4633252A (en) * | 1983-08-29 | 1986-12-30 | Dickey-John Corporation | Radar velocity sensor |
| RU2242767C1 (en) * | 2003-05-05 | 2004-12-20 | Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт "Сигнал" | Device for measuring velocity of on-ground moving object |
| RU2246737C1 (en) * | 2003-06-03 | 2005-02-20 | Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт "Сигнал" | Doppler transducer of path increments |
| RU2399068C1 (en) * | 2009-09-03 | 2010-09-10 | Российская Федерация, от имени которой выступает Министерство обороны Российской Федерации | Doppler route increment sensor with verification device |
| RU2769956C1 (en) * | 2021-02-04 | 2022-04-11 | Общество с ограниченной ответственностью "НАУЧНО-ПРОИЗВОДСТВЕННОЕ ОБЪЕДИНЕНИЕ САУТ" (ООО "НПО САУТ") | Method and system for determining the speed of a locomotive and the direction of movement |
-
1974
- 1974-07-19 GB GB3463773A patent/GB1468159A/en not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1980001418A1 (en) * | 1978-12-28 | 1980-07-10 | Fritzlen M | Radar speedometer |
| US4231039A (en) * | 1978-12-28 | 1980-10-28 | Glymar | Radar speedometer |
| GB2144599A (en) * | 1983-07-20 | 1985-03-06 | Plessey Co Plc | Distinguishing different types of movement |
| US4633252A (en) * | 1983-08-29 | 1986-12-30 | Dickey-John Corporation | Radar velocity sensor |
| RU2242767C1 (en) * | 2003-05-05 | 2004-12-20 | Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт "Сигнал" | Device for measuring velocity of on-ground moving object |
| RU2246737C1 (en) * | 2003-06-03 | 2005-02-20 | Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт "Сигнал" | Doppler transducer of path increments |
| RU2399068C1 (en) * | 2009-09-03 | 2010-09-10 | Российская Федерация, от имени которой выступает Министерство обороны Российской Федерации | Doppler route increment sensor with verification device |
| RU2769956C1 (en) * | 2021-02-04 | 2022-04-11 | Общество с ограниченной ответственностью "НАУЧНО-ПРОИЗВОДСТВЕННОЕ ОБЪЕДИНЕНИЕ САУТ" (ООО "НПО САУТ") | Method and system for determining the speed of a locomotive and the direction of movement |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19940718 |