GB618499A - Improvements in or relating to arrangements for locating obstacles by electromagnetic waves - Google Patents
Improvements in or relating to arrangements for locating obstacles by electromagnetic wavesInfo
- Publication number
- GB618499A GB618499A GB1320145A GB1320145A GB618499A GB 618499 A GB618499 A GB 618499A GB 1320145 A GB1320145 A GB 1320145A GB 1320145 A GB1320145 A GB 1320145A GB 618499 A GB618499 A GB 618499A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- pulse
- bias
- oscillator
- grid
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/282—Transmitters
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
618,499. Radiolocation; pulse circuits. STANDARD TELEPHONES & CABLES, Ltd., CHATTERJEA, P. K., and HOUGHTON, L. W. May 25, 1945, No. 13201. Addition to 586,833. [Classes 40 (vi) and 40 (vii)] In a radiolocation system as described in the parent Specification, in which a pulse-generating saw-tooth oscillator is synchronized by the reflected pulses so that the pulse-recurrence frequency is a measure of the distance to the reflecting object, faulty operation by reflected pulses from objects beyond the range for which the system is designed, i.e. at distances greater than that corresponding to the maximum pulserecurrence frequency provided by the oscillator circuits, is prevented by biassing the grid of the oscillator, which is of the gas-filled type, by a potential obtained by rectifying the sawtooth output. In the system shown, the output of the gas-filled triode 11 is fed to a valve 23 which constitutes the first valve of the pulse generator and may be of the overload type. The storage condenser for the relaxation circuit comprises a condenser 15 fed through a resistance 16 and the time constant of the circuit for a given grid bias determines the maximum range of the system. A diode 28 with a load resistance 21 and storage condenser 29 is arranged across the tube 11, and the rectified output is applied to the range meter 9 and to the grid of the tube 11. The bias thus applied to tube 11 varies inversely with the anode potential so that it has a small value, which can be overcome by echo pulses, just before the tube is due to fire, but has a large value after the tube has fired so that echo pulses arriving from objects beyond the maximum range are unable, due to this bias and to their relatively-small amplitude, to fire it again.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1320145A GB618499A (en) | 1945-05-25 | 1945-05-25 | Improvements in or relating to arrangements for locating obstacles by electromagnetic waves |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1320145A GB618499A (en) | 1945-05-25 | 1945-05-25 | Improvements in or relating to arrangements for locating obstacles by electromagnetic waves |
Publications (1)
Publication Number | Publication Date |
---|---|
GB618499A true GB618499A (en) | 1949-02-23 |
Family
ID=10018673
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1320145A Expired GB618499A (en) | 1945-05-25 | 1945-05-25 | Improvements in or relating to arrangements for locating obstacles by electromagnetic waves |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB618499A (en) |
-
1945
- 1945-05-25 GB GB1320145A patent/GB618499A/en not_active Expired
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