GB581160A - Improvements in and relating to electrical range finders - Google Patents
Improvements in and relating to electrical range findersInfo
- Publication number
- GB581160A GB581160A GB2966339A GB2966339A GB581160A GB 581160 A GB581160 A GB 581160A GB 2966339 A GB2966339 A GB 2966339A GB 2966339 A GB2966339 A GB 2966339A GB 581160 A GB581160 A GB 581160A
- Authority
- GB
- United Kingdom
- Prior art keywords
- meter
- output
- fed
- indicator
- receiver
- 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
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
581,160. Radiolocation. NASH & THOMPSON, Ltd., NASH, A. G. FRAZER-, and WHITAKER, A. Nov. 8, 1939, No. 29663. [Class 40 (v)] The range and rate of change of range of an object, such as an aircraft, are determined separately. The frequency of an oscillator 1, Fig. 1, is modulated by a saw-tooth modulator 2 and the output is fed by a transmission line 3 to a dipole aerial 4 mounted in a reflector 5. The signal after reflection from the distant object is received on a dipole aerial 7 and passed by a transmission line 8 to a receiver 9. A small proportion of the radiated signal from the oscillator 1 is byepassed by a coupling 10 direct to the receiver 9. This produces a difference frequency which depends both on the velocity of the target in the line of sight and on its distance, and is fed to one input circuit of a meter unit 11. A second oscillator 12 generates a constant frequency which is transmitted to a dipole aerial 14. After reflection, the signal is received on a dipole aerial 16 and transmitted to a receiver 19. A small portion of the transmitted oscillation is passed directly to the receiver 19 through a coupling 20. The output of the receiver contains a difference frequency which depends only on the velocity of the target in the line of sight, and is fed to one input circuit of the meter unit 11. The four directional reflectors 5, 6, 15, 17 have parallel axes and can be turned together in any desired direction. The meter unit is shown in Fig. 2. The difference frequencies from the receivers 9, 19 are fed to frequency meters 24, 23 respectively, these meters developing a D.C. output which depends on the frequency but not the magnitude of the input. The outputs of the meters 23, 24 are fed to a network comprising D.C. indicators 25, 26 and a resistance 27. The output of the meter 23 is fed through the indicator 25, which is calibrated in line of sight velocity or rate of change of range. The output of the meter 23 also passes in part through the indicator 26, through which also passes in the reverse direction a part of the output of the meter 24. The output impedances of the meters 23, 24 and the impedances of the indicators 25, 26 and the resistance 27 are so chosen that the component of the current from the meter 23 passing through the indicator 26 is equal and opposite to the part of the component of current from the meter 24 passing through the same indicator and representing the rate of change of range component of the output of the meter 24. The indicator 26 may then be calibrated directly in terms of range.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2966339A GB581160A (en) | 1939-11-08 | 1939-11-08 | Improvements in and relating to electrical range finders |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2966339A GB581160A (en) | 1939-11-08 | 1939-11-08 | Improvements in and relating to electrical range finders |
Publications (1)
Publication Number | Publication Date |
---|---|
GB581160A true GB581160A (en) | 1946-10-03 |
Family
ID=10295128
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2966339A Expired GB581160A (en) | 1939-11-08 | 1939-11-08 | Improvements in and relating to electrical range finders |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB581160A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2567197A (en) * | 1950-08-30 | 1951-09-11 | Fox Nelson | Duplex switch with sum and difference frequency receivers |
CN107515101A (en) * | 2017-09-04 | 2017-12-26 | 中国电子科技集团公司第四十研究所 | The dynamic parameter calibrating installation and method of a kind of stab ilized electro-optical sight system stable measurement device |
-
1939
- 1939-11-08 GB GB2966339A patent/GB581160A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2567197A (en) * | 1950-08-30 | 1951-09-11 | Fox Nelson | Duplex switch with sum and difference frequency receivers |
CN107515101A (en) * | 2017-09-04 | 2017-12-26 | 中国电子科技集团公司第四十研究所 | The dynamic parameter calibrating installation and method of a kind of stab ilized electro-optical sight system stable measurement device |
CN107515101B (en) * | 2017-09-04 | 2020-06-09 | 中国电子科技集团公司第四十一研究所 | Dynamic parameter calibration device and method for stability measuring device of photoelectric sight stabilizing system |
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