GB935694A - Radar system - Google Patents
Radar systemInfo
- Publication number
- GB935694A GB935694A GB4309259A GB4309259A GB935694A GB 935694 A GB935694 A GB 935694A GB 4309259 A GB4309259 A GB 4309259A GB 4309259 A GB4309259 A GB 4309259A GB 935694 A GB935694 A GB 935694A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulses
- pulse
- phase
- carrier
- wave
- 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
- G01S13/30—Systems for measuring distance only using transmission of interrupted, pulse modulated waves using more than one pulse per radar period
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
935,694. Pulse radar; pulse modulation systems. STANDARD TELEPHONES & CABLES Ltd. (Nippon Electric Co. Ltd.). Dec. 18, 1959, No. 43092/59. Classes 40 (5) and 40 (7). In order to prevent jamming of a pulse radar the transmitted signal comprises recurrent groups of carrier-wave pulses, the pulses in each group being spaced in time according to a predetermined code and the phase of the carrier-wave being varied in time in accordance with a predetermined code, and the receiver includes a decoding circuit comprising means for delaying at least one portion of the received carrier-wave with respect to another by a time interval dependent on the spacing between the transmitted pulses and means for shifting the phase of the said one portion of the carrier - wave with respect to the other. As described, each pulse group comprises three pulses 1, 2, 3, Fig. 1. The time intervals # 1 , # 2 between pulses 1, 2 and 2, 3 are different, both # 1 and # 2 are integral multiples of the RF period and the RF phase of pulse 1 is opposite to that of pulses 2 and 3 as indicated by the hatching on the pulse 1. At the receiver the RF or IF echo pulses are applied to a decoder, Fig. 3, having input and output terminals 24, 30 and comprising two delay devices 25, 27 having delay times # 2 and # 1 respectively and a phase changer 29 which shifts the carrier phase by 180 degrees. Thus, each pulse reaches the output terminal 30 (1) directly, (2) with a delay # 2 , and (3) with a delay # 1 and # 2 , and a 180 degree phase shift. The resultant three components of each of the pulses 1, 2 and 3 are shown in Fig. 4 (a), (b) and (c) respectively, and it is seen that the third, second and first components of pulses 1, 2 and 3 respectively, combine to give a large amplitude pulse 34, Fig. 4 (d), which may be separated from the other components by an amplitude discriminator. In a superheterodyne receiver, Fig. 2 (not shown), the CW RF input to the transmitter modulator is obtained by heterodyning outputs from the local oscillator and an IF oscillator and selecting one sideband.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4309259A GB935694A (en) | 1959-12-18 | 1959-12-18 | Radar system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4309259A GB935694A (en) | 1959-12-18 | 1959-12-18 | Radar system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB935694A true GB935694A (en) | 1963-09-04 |
Family
ID=10427288
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4309259A Expired GB935694A (en) | 1959-12-18 | 1959-12-18 | Radar system |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB935694A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0050493A1 (en) * | 1980-10-20 | 1982-04-28 | Megapulse Incorporated | Radio navigation method and system using transmission of pulse groups by a plurality of stations |
EP1496371A1 (en) * | 2003-07-07 | 2005-01-12 | Mitsubishi Electric Information Technology Centre Europe B.V. | Generation of packets of waveforms |
-
1959
- 1959-12-18 GB GB4309259A patent/GB935694A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0050493A1 (en) * | 1980-10-20 | 1982-04-28 | Megapulse Incorporated | Radio navigation method and system using transmission of pulse groups by a plurality of stations |
EP1496371A1 (en) * | 2003-07-07 | 2005-01-12 | Mitsubishi Electric Information Technology Centre Europe B.V. | Generation of packets of waveforms |
US7408499B2 (en) | 2003-07-07 | 2008-08-05 | Mitsubishi Electric Corporation | Generations of sequences of waveforms |
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