GB1073995A - Improvements in or relating to chart position indicating apparatus - Google Patents
Improvements in or relating to chart position indicating apparatusInfo
- Publication number
- GB1073995A GB1073995A GB255865A GB255865A GB1073995A GB 1073995 A GB1073995 A GB 1073995A GB 255865 A GB255865 A GB 255865A GB 255865 A GB255865 A GB 255865A GB 1073995 A GB1073995 A GB 1073995A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chart
- motor
- spools
- navigation system
- frequency
- 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)
- Position Fixing By Use Of Radio Waves (AREA)
- Control Of Position Or Direction (AREA)
Abstract
1,073,995. Course recording and position indicating apparatus. DECCA Ltd. Jan. 12, 1966 [Jan. 20, 1965], No.2558/65. Headings G1F and G1J. In chart position indicating apparatus for use with a radio navigation system providing signals representing at least one co-ordinate of position of a mobile craft, and having a chart in the form of a strip carried on two spools so as to be movable to and fro in one direction relative to an index, a direct current motor is provided for driving the spools and this motor is energized by a succession of pulses, whose mark to space ratio is variable i.e. it can be one of two fixed values, depending on the required speed of movement of the chart, the pulse repetition frequency being substantially greater than the dominant mechanised resonant frequency of the spools and chart, which is to some extent resilient, so that the chart is moved substantially continuously by the motor. The chart and spool arrangement is as described in Specification 1,073,991 the chart strip having at one edge a plurality of digitally coded tracks of opaque markings, the apparatus being provided with a photo-electric detection system allowing the actual position of the chart to be compared with the craft position as detected by the radio navigation system, preferably a hyperbolic navigation system. The system of chart and spools when driven by a pulsed motor has a certain resonant frequency and if the pulse frequency corresponds closely to this frequency the chart will oscillate to and fro. The pulse frequency is thus increased to prevent this effect and the mark to space ratio of the pulses can have one of two fixed values depending on the desired drive rate for the chart. The motor may also be driven continuously if a coarse adjustment of the chart is required. The system operates automatically from the signals received from the radio navigation system and arrangements are described whereby the chart is driven at the correct speed and is positioned correctly so that the index indicates the craft position in the coordinate direction represented by the chart movement. A transistor switching bridge circuit is also provided to prevent overshoot of the motor drive between the pulses.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB255865A GB1073995A (en) | 1965-01-20 | 1965-01-20 | Improvements in or relating to chart position indicating apparatus |
| NO16130866A NO117085B (en) | 1965-01-20 | 1966-01-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB255865A GB1073995A (en) | 1965-01-20 | 1965-01-20 | Improvements in or relating to chart position indicating apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1073995A true GB1073995A (en) | 1967-06-28 |
Family
ID=9741700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB255865A Expired GB1073995A (en) | 1965-01-20 | 1965-01-20 | Improvements in or relating to chart position indicating apparatus |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB1073995A (en) |
| NO (1) | NO117085B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4028603A (en) * | 1972-07-31 | 1977-06-07 | Gabriel Selam | Device for detecting and positioning a mobile object capable of moving in at least one given path |
| GB2164152A (en) * | 1984-06-02 | 1986-03-12 | Citizen Watch Co Ltd | Pointer type measuring instrument |
-
1965
- 1965-01-20 GB GB255865A patent/GB1073995A/en not_active Expired
-
1966
- 1966-01-18 NO NO16130866A patent/NO117085B/no unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4028603A (en) * | 1972-07-31 | 1977-06-07 | Gabriel Selam | Device for detecting and positioning a mobile object capable of moving in at least one given path |
| GB2164152A (en) * | 1984-06-02 | 1986-03-12 | Citizen Watch Co Ltd | Pointer type measuring instrument |
Also Published As
| Publication number | Publication date |
|---|---|
| NO117085B (en) | 1969-06-30 |
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