GB1506989A - Rain echo elimination device - Google Patents
Rain echo elimination deviceInfo
- Publication number
- GB1506989A GB1506989A GB4331876A GB4331876A GB1506989A GB 1506989 A GB1506989 A GB 1506989A GB 4331876 A GB4331876 A GB 4331876A GB 4331876 A GB4331876 A GB 4331876A GB 1506989 A GB1506989 A GB 1506989A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phase
- cos
- sin
- rain
- amplitude
- 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
- 230000008030 elimination Effects 0.000 title 1
- 238000003379 elimination reaction Methods 0.000 title 1
- 238000010606 normalization Methods 0.000 abstract 1
- 230000010363 phase shift Effects 0.000 abstract 1
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
- G01S7/024—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using polarisation effects
- G01S7/026—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using polarisation effects involving the transmission of elliptically or circularly polarised 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)
- Radar Systems Or Details Thereof (AREA)
Abstract
1506989 Radar INTERNATIONAL STANDARD ELECTRIC CORP 19 Oct 1976 [24 Oct 1975] 43318/76 Heading H4D In a radar incorporating rain clutter removal, the transmitted circular polarized pulse is produced by combined (4) phase quadrature, horizontal H and vertical V polarized components. The rain returned horizontal and vertical components may not be in phase quadrature and of equal amplitude (return elliptically polarized) such that addition of a #/2 phase shifter 15 in one IF channel does not give two antiphase equal amplitude signals which cancel out at 18. The deviation from antiphase is thus detected at 19 and compensated for using a gated (h, 21, 22) portion Fig. 2b wider than but excluding the range gated portion, Fig. 2a, and a controlled variable phase shifter 16. The deviation from amplitude equality is detected at 23 and compensated for using a controlled variable attenuator 17. If the, e.g. H component is below a threshold S (25) indicating negligible rain, the servo loops are opened (20, 24) and the signals made in phase by the addition of a # phase shift 13. A Doppler radar embodiment, Fig. 3 (not shown), operates on the Sin and Cos parts of each H and V component, the amplitude comparison using Sin<SP>2</SP> + Cos<SP>2</SP> formula and the phase comparison using Sin.Cos-Cos.Sin formula. Normalization is also used.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7532569A FR2328972A1 (en) | 1975-10-24 | 1975-10-24 | RAIN ECHO ELIMINATION DEVICE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1506989A true GB1506989A (en) | 1978-04-12 |
Family
ID=9161606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4331876A Expired GB1506989A (en) | 1975-10-24 | 1976-10-19 | Rain echo elimination device |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE2646537A1 (en) |
| FR (1) | FR2328972A1 (en) |
| GB (1) | GB1506989A (en) |
| IT (1) | IT1068764B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2489965A1 (en) * | 1980-09-05 | 1982-03-12 | Emi Ltd | RADAR DEVICE |
| GB2421386A (en) * | 2004-12-17 | 2006-06-21 | Boeing Co | Dual circular polarization radar |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2926193A1 (en) * | 1979-06-29 | 1981-01-22 | Standard Elektrik Lorenz Ag | RADAR DEVICE FROM WHICH POLARIZED SIGNALS ARE EMISSED |
| DE3210400C2 (en) * | 1982-03-20 | 1993-12-16 | Sel Alcatel Ag | Radar device from which pulsed signals are emitted |
-
1975
- 1975-10-24 FR FR7532569A patent/FR2328972A1/en active Granted
-
1976
- 1976-10-15 DE DE19762646537 patent/DE2646537A1/en not_active Withdrawn
- 1976-10-19 GB GB4331876A patent/GB1506989A/en not_active Expired
- 1976-10-21 IT IT2854376A patent/IT1068764B/en active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2489965A1 (en) * | 1980-09-05 | 1982-03-12 | Emi Ltd | RADAR DEVICE |
| GB2421386A (en) * | 2004-12-17 | 2006-06-21 | Boeing Co | Dual circular polarization radar |
| GB2421386B (en) * | 2004-12-17 | 2007-11-07 | Boeing Co | Methods and systems for dual circular polarization radar detection |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2328972A1 (en) | 1977-05-20 |
| IT1068764B (en) | 1985-03-21 |
| DE2646537A1 (en) | 1977-06-23 |
| FR2328972B1 (en) | 1982-05-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |