GB1480587A - Radar systems - Google Patents
Radar systemsInfo
- Publication number
- GB1480587A GB1480587A GB3712373A GB3712373A GB1480587A GB 1480587 A GB1480587 A GB 1480587A GB 3712373 A GB3712373 A GB 3712373A GB 3712373 A GB3712373 A GB 3712373A GB 1480587 A GB1480587 A GB 1480587A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulse
- output
- integrator
- leakage
- ranging period
- 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
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/10—Systems for measuring distance only using transmission of interrupted, pulse modulated waves
- G01S13/14—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein a voltage or current pulse is initiated and terminated in accordance respectively with the pulse transmission and echo reception
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
1480587 Radar PLESSEY CO Ltd and I D LONGSTAFF 18 July 1974 [4 Aug 1973] 37123/73 Heading H4D In a pulse radar, especially an altimeter, the use of the trigger pulse A, Fig. 2, to define the start of the ranging period and the use of the echo pulse D at the receiver 6, Fig. 1, output to define the end of the ranging period, ignores the delay T1 between the trigger pulse and the actual transmitted pulse B and the delay T2 between the echo C as received at the antenna and the pulse D. As T1 and T2 are randomly temperature dependant, this produces large errors at very small ranges (altitudes). It is therefor proposed to use the leakage pulse E of the transmitted pulse to define the start of the ranging period, said pulse E being delayed the required amount T3=T1+T2 from the trigger pulse. During an assumed time of reception of the leakage pulse E, the receiver 6 has its gains increased and a leakage integrator 16 is bought into circuit by the closure of switches 18 and 19. The leakage integrator output resets at ¢ v. and is compared at 10 with a sawtooth voltage from 5 synchronous with the transmitted pulses. Equality in the comparator 10 enables range gate 9 which produces a positive signal increasing the integrator output if the pulse E is not acquired and a negative signal if it is. The integrator output is varied until the pulse E is acquired whereby its output at one input of differential amplifier 23 represents T3. During the remainder of the ranging period, switches 20, 21 close and 18, 19 open, giving a change over to integrator 14 resetting at 10 v. The integrator output is controlled by the gate 9 output until the echo pulse D is acquired whereby said output, at the second input to differential amplifier 23, produces the required error free output therefrom.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3712373A GB1480587A (en) | 1974-07-18 | 1974-07-18 | Radar systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3712373A GB1480587A (en) | 1974-07-18 | 1974-07-18 | Radar systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1480587A true GB1480587A (en) | 1977-07-20 |
Family
ID=10393922
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3712373A Expired GB1480587A (en) | 1974-07-18 | 1974-07-18 | Radar systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1480587A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7525477B2 (en) * | 2005-01-17 | 2009-04-28 | Fujitsu Component Limited | Distance measuring device |
-
1974
- 1974-07-18 GB GB3712373A patent/GB1480587A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7525477B2 (en) * | 2005-01-17 | 2009-04-28 | Fujitsu Component Limited | Distance measuring device |
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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: 19940717 |