GB1298709A - Improvements in or relating to pulse-doppler systems - Google Patents

Improvements in or relating to pulse-doppler systems

Info

Publication number
GB1298709A
GB1298709A GB2666870A GB2666870A GB1298709A GB 1298709 A GB1298709 A GB 1298709A GB 2666870 A GB2666870 A GB 2666870A GB 2666870 A GB2666870 A GB 2666870A GB 1298709 A GB1298709 A GB 1298709A
Authority
GB
United Kingdom
Prior art keywords
blind
comparators
voltage
given
pulse
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
Application number
GB2666870A
Inventor
Malcolm Geoffrey Cross
John Howard Dawson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BAE Systems Electronics Ltd
Original Assignee
Marconi Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Marconi Co Ltd filed Critical Marconi Co Ltd
Priority to GB2666870A priority Critical patent/GB1298709A/en
Priority to NL7107521A priority patent/NL7107521A/xx
Priority to FR7120000A priority patent/FR2093988B1/fr
Priority to DE19712127365 priority patent/DE2127365C3/en
Priority to CH809371A priority patent/CH541813A/en
Publication of GB1298709A publication Critical patent/GB1298709A/en
Expired legal-status Critical Current

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
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/52—Discriminating between fixed and moving objects or between objects moving at different speeds
    • G01S13/522—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves
    • G01S13/524—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi
    • G01S13/526—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi performing filtering on the whole spectrum without loss of range information, e.g. using delay line cancellers or comb filters
    • G01S13/528—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi performing filtering on the whole spectrum without loss of range information, e.g. using delay line cancellers or comb filters with elimination of blind speeds

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

1298709 Pulse radar MARCONI CO Ltd 4 May 1971 [2 June 1970] 26668/70 Heading H4D In a pulse Doppler radar the relationships between pulse repetition period (p.r.p.) and range and between p.r.p. and Doppler frequency shift exhibit "blind" zones, Figs. 1 and 6 (neither shown). According to one aspect of the present invention electrical parameters representative of target range r and pulse repetition period p are compared in a multiplicity of fractional relationships each related to a different relationship between r and p at which the radar changes to a blind to a non-blind condition and vice versa, and an indication is given of the suitability or otherwise of a p for transmission or p is controlled; according to the second aspect of the invention an arrangement mutatis mutandis is provided in respect of p and target velocity v. Preferably both aspects are provided. In an embodiment resistors R A ... R D , R F , R G , R H correspond to the slopes of lines (A ... D, F, G, H, Fig. 1, not shown) on the r, p graph which represent boundaries of blind zones, are supplied from a voltage V R representing a given range, and the currents therethrough are monitored by circuits incorporating transistors TR1A ... TR1H: corresponding voltage comparators 5A &c. are each arranged to produce a bi-stable output which changes state as the corresponding input voltage passes through a reference potential which is earth potential for comparators 5A ... FD and a voltage V s , corresponding to an "offset" range (see Fig. 1, not shown), for comparators 5E ... 5H. A sawtooth voltage, such that zero amplitude represents ap magnitude of zero and maximum amplitude represents maximum p magnitude, is applied to terminal T2. The outputs of the coparators are combined in logical circuit L, a "0" signal at the output terminal of which corresponds to the "non-blind" areas; such signal may be utilized to indicate the suitability or otherwise of given p's for a given r, or may control p automatically. In a modification there is a difference in the manner in which the voltages applied to the comparators 5A ... 5D, 5F, 5G, 5H are derived, Figs. 8, 9 (neither shown). A staircase waveform may replace the sawtooth.
GB2666870A 1970-06-02 1970-06-02 Improvements in or relating to pulse-doppler systems Expired GB1298709A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB2666870A GB1298709A (en) 1970-06-02 1970-06-02 Improvements in or relating to pulse-doppler systems
NL7107521A NL7107521A (en) 1970-06-02 1971-06-01
FR7120000A FR2093988B1 (en) 1970-06-02 1971-06-02
DE19712127365 DE2127365C3 (en) 1970-06-02 1971-06-02 Pulse Doppler radar system for distance or speed display with variable pulse train period or frequency
CH809371A CH541813A (en) 1970-06-02 1971-06-02 Doppler pulse installation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2666870A GB1298709A (en) 1970-06-02 1970-06-02 Improvements in or relating to pulse-doppler systems

Publications (1)

Publication Number Publication Date
GB1298709A true GB1298709A (en) 1972-12-06

Family

ID=10247294

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2666870A Expired GB1298709A (en) 1970-06-02 1970-06-02 Improvements in or relating to pulse-doppler systems

Country Status (5)

Country Link
CH (1) CH541813A (en)
DE (1) DE2127365C3 (en)
FR (1) FR2093988B1 (en)
GB (1) GB1298709A (en)
NL (1) NL7107521A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016201469A1 (en) * 2015-06-15 2016-12-22 Riegl Laser Measurement Systems Gmbh Method for measuring a distance

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4143373A (en) * 1977-09-21 1979-03-06 Hughes Aircraft Company Adaptive radar systems and methods therefor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2981942A (en) * 1952-01-23 1961-04-25 Raytheon Co Pulse echo systems
US3147476A (en) * 1959-05-28 1964-09-01 Dynamics Corp America Long range radar ranging system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016201469A1 (en) * 2015-06-15 2016-12-22 Riegl Laser Measurement Systems Gmbh Method for measuring a distance
US20180224528A1 (en) * 2015-06-15 2018-08-09 Riegl Laser Measurement Systems Gmbh Method For Measuring A Distance
US10725155B2 (en) 2015-06-15 2020-07-28 Riegl Laser Measurement Systems Gmbh Method for measuring a distance

Also Published As

Publication number Publication date
DE2127365C3 (en) 1975-01-09
FR2093988A1 (en) 1972-02-04
NL7107521A (en) 1971-12-06
DE2127365A1 (en) 1971-12-16
CH541813A (en) 1973-09-15
DE2127365B2 (en) 1974-05-16
FR2093988B1 (en) 1976-05-28

Similar Documents

Publication Publication Date Title
GB1298709A (en) Improvements in or relating to pulse-doppler systems
GB1488584A (en) Impulse response magnetic resonance spectrometer
GB1382039A (en) Multiple frequency doppler radar system for vehicle passengers
US3267470A (en) Radially intensified ppi collision course detector
US3333266A (en) Dual spectrum radar ranging
US3026514A (en) Moving target selector
GB1493808A (en) Doppler radar system
US3105192A (en) Frequency trancking and deviation indicating system including signal storage means
GB1291240A (en) Mti radar system utilizing variable interpulse periods
US3213376A (en) Digital velocity meter
US3262112A (en) Time compensation for doppler frequency
US3749939A (en) Phase difference measuring device
GB1584557A (en) Phase control circuit arrangement
EP0194520A2 (en) Voltage regulator for line modulators for use in transmitters for radar applications
US3487461A (en) Frequency tracking circuit
GB1445572A (en) Code signal receiver circuits
US3343159A (en) Radar plan-position indicator systems
US4130795A (en) Versatile LDV burst simulator
US3327042A (en) Target generator device
SU566201A1 (en) Phase-angle meter
US3546697A (en) Method and apparatus for interpolating dme information
GB1092208A (en) Improvements in or relating to pulsed radar systems
SU1223369A2 (en) Delta modulator
RU1826076C (en) Device for determination of time position and duration of pulse
SU741412A1 (en) Device for compensating for radio signal non-linear distortions

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee