GB897101A - Improvements in collision warning apparatus - Google Patents
Improvements in collision warning apparatusInfo
- Publication number
- GB897101A GB897101A GB11603/58A GB1160358A GB897101A GB 897101 A GB897101 A GB 897101A GB 11603/58 A GB11603/58 A GB 11603/58A GB 1160358 A GB1160358 A GB 1160358A GB 897101 A GB897101 A GB 897101A
- Authority
- GB
- United Kingdom
- Prior art keywords
- craft
- master
- pulse
- intruder
- cos
- 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
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
- G01S13/933—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of aircraft or spacecraft
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Aviation & Aerospace Engineering (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
897,101. Anti-collision radio systems. AVEL CORPORATION GENEVA. April 3, 1959 [April 11, 1958], No. 11603/58. Classes 40(5) and 40(7). [Also in Group XXXVI] In a system for giving a warning on a Master craft B, Fig. 1, if it is on a collision course with reference to an Intruder craft A, the Intruder craft A transmits by radio to the Master craft B data indicating its speed VA and heading a and the Master craft B determines (1) its own speed VB and heading b and (2) the relative and true bearings d and (b+d) of the Intruder craft A and computes the components C and D of the relative velocity of the two craft resolved respectively perpendicular and parallel to the line of sight BA according to the equations a warning indicating the danger of collision being produced if C = O and D # O. The velocity data of the Intruder craft A is transmitted in the form of orthogonally resolved components V A sin a, V A cos a by pulse space modulation; alternatively pulse-duration, pulsecode or frequency modulation may be employed. In the aircraft system described the Master craft B carries a scanning pulse radar CCW, Fig. 2, with a P.P.I. display operating at a radio frequency f1 and the intruder craft A carries a transponder, Fig. 3 (not shown), which, in response to each interrogating pulse, transmits at a radio frequency f2 a reply signal comprising two identical groups of four pulses, Fig. 5 (not shown), spaced apart by an interval proportional to the height of the craft A, the spacing between the first and second pulses of each group being fixed and the spacing between the second and third and between the third and fourth being proportional to VA sin a and VA cos a respectively. Reply signals having a coding corresponding to the height of the Master craft B are received at the craft B by an aerial A4 and receiver Rx3 and are selected by a height gate HG controlled by an altimeter H and voltages VA sin a and V A cos a produced by decoders Dl and D2 are applied to an electronic computer EC, Fig. 4 (not shown) (see Group XXXVI), together with voltages sin (b+d), cos (b+d), V B sin d, V B cos d produced by resolvers R1-R4 having inputs VB, b and d from the airspeed meter AS, compass CR and radar aerial Al, the output from the computer EC being applied to a warning indicator W. As shown in Fig. 2 the angle d is the instantaneous position of the radar aerial A1; alternatively if the responsor Rx3 is provided with a rotating directional aerial A4 then the angle d may be the instantaneous position of the aerial A4. The Master craft B also carries a transponder Rx2, Tx2 similar to that carried by the Intruder craft A so that the craft B can co-operate with other interrogationequipped Master craft, the reply signal transmitted by Tx2 being coded in accordance with V B sin b, V B cos b and the height of the Master craft B; a muting signal from the pulse generator P9 of the radar CCW is applied to the transponder receiver Rx2 to prevent triggering by the transmitted radar pulses and a fourth muting signal (not shown) may be applied to the receiver Rx3 to include reply signals from craft beyond a safe distance. The pulse spacing coders and decoders comprise conventional arrangements of adjustable delay lines (e.g. as in Specification 659,007) and coincidence circuits illustrated in Figs. 5 and 6 (not shown). If required the interrogating pulses from the radar CCW may be coded in frequency, pulse duration or pulse spacing as in Specification 897,100 the transponder being arranged to reply only to signals with a height code corresponding to the height of the transponder. Specifications 838,034, 874,261 and 874,263 also are referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB11603/58A GB897101A (en) | 1958-04-11 | 1958-04-11 | Improvements in collision warning apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB11603/58A GB897101A (en) | 1958-04-11 | 1958-04-11 | Improvements in collision warning apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB897101A true GB897101A (en) | 1962-05-23 |
Family
ID=9989283
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB11603/58A Expired GB897101A (en) | 1958-04-11 | 1958-04-11 | Improvements in collision warning apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB897101A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115268472A (en) * | 2022-09-28 | 2022-11-01 | 天津大学 | Intelligent ship navigation collision avoidance behavior coding method based on machine language expression |
-
1958
- 1958-04-11 GB GB11603/58A patent/GB897101A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115268472A (en) * | 2022-09-28 | 2022-11-01 | 天津大学 | Intelligent ship navigation collision avoidance behavior coding method based on machine language expression |
CN115268472B (en) * | 2022-09-28 | 2022-12-20 | 天津大学 | Intelligent ship navigation collision avoidance behavior coding method based on machine language expression |
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