GB1106656A - Improvements in automatic radar tracking systems - Google Patents
Improvements in automatic radar tracking systemsInfo
- Publication number
- GB1106656A GB1106656A GB3017065A GB3017065A GB1106656A GB 1106656 A GB1106656 A GB 1106656A GB 3017065 A GB3017065 A GB 3017065A GB 3017065 A GB3017065 A GB 3017065A GB 1106656 A GB1106656 A GB 1106656A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- output
- phase
- mixer
- demodulator
- 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
- G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
-
- 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
- G01S13/66—Radar-tracking systems; Analogous systems
- G01S13/70—Radar-tracking systems; Analogous systems for range tracking only
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
1,106,656. Frequency modulated radar. COMPAGNIE FRANCAISE THOMSON HOUSTON-HOTCHKISS BRANDT. 15 July, 1965 [17 July, 1964], No. 30170/65. Heading H4D. In a frequency modulated radar system, radiation is transmitted starting at time t<SP>1</SP>=0, with an angular frequency given by #(t)= # 0 + αt<SP>1</SP> (see Fig. 1b) and, after a sound trip delay of #, an echo signal Ei is received with an angular frequency given by #(t) = # 0 + α(t<SP>1</SP> - #). The echo signal thus has the form A gating signal is applied to a gate 2, receiving the echo-signal at the output of gain controlled input amplifier 1, having a duration T and commencing at a time (# + t 0 ) supposedly synchronous with the commencement of the echo signal (i.e. it is assumed that t 0 =0). The gated echo signal is fed via a " total " signal path 20 and a " difference " signal path 10, to respective mixers 21 and 11. An oscillator 50 is triggered by the gating signal to generate a signal having an angular frequency given by # 0 +# 0 + α(t<SP>1</SP> - 0 - t 0 ). This signal is applied to mixer 21, to produce a " total " beat signal, Fig. 1b, having a duration # and an angular frequency of (# 0 - αt 0 ). The oscillator signal is also applied to a phase reverser 51, which reverses the phase of the oscillation after a time #/2 and applies its output to mixer 11. The output of mixer 21 is applied to a narrow band filter 23, centred on frequency # 0 , to give a signal which is applied to one input of phase demodulator 3. The " difference " beat signal output of mixer 11 is applied to a similar narrow band filter 13, to give, from two signals corresponding to the two halves of the phase reverser output, a signal After passage through a 90 degrees phase shifter 14, this signal becomes and is applied to the second input of demodulator 3. The demodulator gives an output of the form:- or with reference to standard amplitude (A#/2)<SP>2</SP> and assuming t 0 is very small:- Thus this signal is a linear function of the error timing to of the gating signal, and by making α, #/4 large, a very sensitive error signal can be produced for correcting the position of the gating signal. The detected output of filter 23 may be compared with a reference signal to produce a gain control signal for amplifier 1 whereby the amplitude of the signal # is kept constant. By replacing filters 13 and 23 by respective groups of parallel connected subfilters, having centre frequencies staggered either side of # 0 , feeding the outputs of corresponding ones of the sub-filters to respective phase demodulators and adding staggered biases to the outputs of the demodulators (see Fig. 2) the waveforms of Fig. 3a produced by each demodulator, may have their linear (t 0 # 0) portions aligned on a composite line, Fig. 3c, to give a much extended linear portion over which the equation E = αt 0 #/4 holds.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR982024A FR1409434A (en) | 1964-07-17 | 1964-07-17 | Improvements in automatic distance tracking processes and devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1106656A true GB1106656A (en) | 1968-03-20 |
Family
ID=8834756
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3017065A Expired GB1106656A (en) | 1964-07-17 | 1965-07-15 | Improvements in automatic radar tracking systems |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE1466041A1 (en) |
FR (1) | FR1409434A (en) |
GB (1) | GB1106656A (en) |
SE (1) | SE344244B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106772297A (en) * | 2017-01-23 | 2017-05-31 | 上海广电通信技术有限公司 | Radar transmission power is measured and automatic frequency tracking system |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE351499B (en) * | 1969-11-26 | 1972-11-27 | Ericsson Telefon Ab L M |
-
1964
- 1964-07-17 FR FR982024A patent/FR1409434A/en not_active Expired
-
1965
- 1965-07-14 SE SE931965A patent/SE344244B/xx unknown
- 1965-07-15 GB GB3017065A patent/GB1106656A/en not_active Expired
- 1965-07-16 DE DE19651466041 patent/DE1466041A1/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106772297A (en) * | 2017-01-23 | 2017-05-31 | 上海广电通信技术有限公司 | Radar transmission power is measured and automatic frequency tracking system |
CN106772297B (en) * | 2017-01-23 | 2023-03-28 | 上海广电通信技术有限公司 | Radar emission power measurement and frequency automatic tracking system |
Also Published As
Publication number | Publication date |
---|---|
FR1409434A (en) | 1965-08-27 |
DE1466041A1 (en) | 1968-12-19 |
SE344244B (en) | 1972-04-04 |
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