GB1007516A - Improvements in or relating to apparatus for producing coded signals - Google Patents

Improvements in or relating to apparatus for producing coded signals

Info

Publication number
GB1007516A
GB1007516A GB1342762A GB1342762A GB1007516A GB 1007516 A GB1007516 A GB 1007516A GB 1342762 A GB1342762 A GB 1342762A GB 1342762 A GB1342762 A GB 1342762A GB 1007516 A GB1007516 A GB 1007516A
Authority
GB
United Kingdom
Prior art keywords
pulse
staircase
network
line
time
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
GB1342762A
Inventor
George Robert Welti
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.)
Raytheon Co
Original Assignee
Raytheon Co
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
Priority to NL277035D priority Critical patent/NL277035A/xx
Priority to US25775A priority patent/US3156914A/en
Application filed by Raytheon Co filed Critical Raytheon Co
Priority to GB1342762A priority patent/GB1007516A/en
Priority to FR895687A priority patent/FR1326648A/en
Priority to DER32609A priority patent/DE1209158B/en
Publication of GB1007516A publication Critical patent/GB1007516A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S13/00Systems 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
    • G01S13/02Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06Systems determining position data of a target
    • G01S13/08Systems for measuring distance only
    • G01S13/10Systems for measuring distance only using transmission of interrupted, pulse modulated waves
    • G01S13/26Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave
    • G01S13/28Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses
    • G01S13/284Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses using coded pulses
    • G01S13/288Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses using coded pulses phase modulated
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S13/00Systems 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
    • G01S13/02Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06Systems determining position data of a target
    • G01S13/08Systems for measuring distance only
    • G01S13/10Systems for measuring distance only using transmission of interrupted, pulse modulated waves
    • G01S13/26Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave
    • G01S13/28Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses
    • G01S13/284Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses using coded pulses
    • G01S13/286Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses using coded pulses frequency shift keyed

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manipulation Of Pulses (AREA)

Abstract

1,007,516. Correlators. RAYTHEON CO. April 6,1962. No. 13427/62. Heading G1U. [Also in Divisions H3 and H5] Apparatus comprises means affording two signals having frequencies which vary with time and symmetrically with respect to each other, and means incorporating delay and phase-inverting devices to produce a signal from the two signals according to a quaternary code of a sequence of 2<SP>n</SP> symbols selected from four symbols a, b, a, #b where a, b, are the phase inversions of a,b. Further rules for constructing the quaternary code are given in the Specification. In the particular embodiment, which is a pulse radar wherein a time-expanded pulse consisting of sub-pulses according to that code is radiated and the echo signals are time-compressed, symbols a, b designate ascending and descending "staircases" of frequency Fig. 6a, b respectively and symbols #a, #b denote similar staircases but with carrier-phase inversion. The invention inhibits the range ambiguity arising from energy spaced in time from that corresponding to the correct echo range at the output of the time-compression device, and increases range accuracy by the use of a large transmitted signal time-bandwidth products. General operation. Figs. 1, 5a. In the pulse radar of Fig. 1 switches 15, 22, 40 and 42 are in the positions shown when transmission is to be effected and in their alternative positions for echo reception. A generator 14 produces a triggering pulse Fig. 5a consisting of a single cycle of a 60 Mc/s oscillation and a gating pulse generator 16 places the switches into their "transmit" positions. The triggering pulse causes a circuit 10, which incorporates pairs of coaxial resonators, to produce the ascending frequency staircase on line 18 and the descending frequency staircase on line 20. Network 11 forms the quaternary-coded signal which is applied after frequency translation in mixer 30 to power amplifier 32 and thence to the aerial via duplexer 34. In the receiving condition, the I.F. output from amplifier 38 is fed to circuit 10 one output of which is fed directly, and the other after inversion by circuit 24, to network 11 which acts by an effecitvely auto-correlation process to form a single output pulse of the same duration as that of a sub-pulse and of enhanced amplitude, Fig. 8 (not shown). In an example the individual sub-pulses are 0.25 microseconds long, the staircase waveform is 1.25 microseconds long, the transmitted waveform is 40 microseconds long, and the final output pulse of the receiver is 0.25 microseconds long. The frequency sweep need not be of staircase form; it may be linear. Production of staircase waveforms. Figs. 2, 3, 5, 6. The triggering pulse Fig. 5a causes successive ringing of pairs of coaxial resonators 61/62, 84/85, 95/96, 97/98 and 99/100 Figs. 3a and 5d.... n to give the ascending staircase pulse train Figs. 5p and 6a on line p Fig. 3b and the descending train Figs. 5a and 6b on line q; diode switches 50, 72, 93, 223 and 214 are closed in this mode and 0.25 microsecond delay lines 52, 78, 229, 222 and 207 ensure termination of ringing at the appropriate times and the successive actuation of resonator pairs. The ascending pulse train is applied to a phase inverter 151 Fig.2 and the descending train, to a delay line 150 in the first section, also incorporating a signal-splitting resistance network 154 and summing amplifiers 155, 156, of a multisection network 11 for forming the quaternary coding, see also Fig. 4 (not shown), from which there ensues on line 27 a pulse train of the form Fig. 6m; one section of the network is described with reference to Fig. 7 (not shown) and its outputs are illustrated by Figs.6h, 6i, wherein a negative sign indicates phase reversal. Network 11 may be composed from two tapped delay lines, Fig. 9 (not shown). The invention is stated to be applicable to communication systems. Reference has been directed by the Comptroller to Specifications 755,721 and 921,311.
GB1342762A 1960-04-29 1962-04-06 Improvements in or relating to apparatus for producing coded signals Expired GB1007516A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL277035D NL277035A (en) 1962-04-06
US25775A US3156914A (en) 1960-04-29 1960-04-29 Transmission and reception of radar signals
GB1342762A GB1007516A (en) 1962-04-06 1962-04-06 Improvements in or relating to apparatus for producing coded signals
FR895687A FR1326648A (en) 1962-04-06 1962-04-26 Improvements to transmitting and receiving systems for radar signals
DER32609A DE1209158B (en) 1962-04-06 1962-05-03 Method and arrangement for signal transmission with coded signal sequences

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1342762A GB1007516A (en) 1962-04-06 1962-04-06 Improvements in or relating to apparatus for producing coded signals

Publications (1)

Publication Number Publication Date
GB1007516A true GB1007516A (en) 1965-10-13

Family

ID=10022773

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1342762A Expired GB1007516A (en) 1960-04-29 1962-04-06 Improvements in or relating to apparatus for producing coded signals

Country Status (2)

Country Link
GB (1) GB1007516A (en)
NL (1) NL277035A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4626855A (en) * 1980-09-27 1986-12-02 The Marconi Company Limited Radar, sonar and similar systems
US5115247A (en) * 1988-02-16 1992-05-19 Honeywell Inc. Frequency modulated, phase coded radar

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4626855A (en) * 1980-09-27 1986-12-02 The Marconi Company Limited Radar, sonar and similar systems
US5115247A (en) * 1988-02-16 1992-05-19 Honeywell Inc. Frequency modulated, phase coded radar

Also Published As

Publication number Publication date
NL277035A (en)

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