SE8200881L - NAVIGATION SIGNAL RECEIVERS - Google Patents

NAVIGATION SIGNAL RECEIVERS

Info

Publication number
SE8200881L
SE8200881L SE8200881A SE8200881A SE8200881L SE 8200881 L SE8200881 L SE 8200881L SE 8200881 A SE8200881 A SE 8200881A SE 8200881 A SE8200881 A SE 8200881A SE 8200881 L SE8200881 L SE 8200881L
Authority
SE
Sweden
Prior art keywords
signals
local oscillator
output
information
demodulator
Prior art date
Application number
SE8200881A
Other languages
Unknown language ( )
Swedish (sv)
Inventor
F Hendil
H H Andersen
Original Assignee
Philips Nv
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 Philips Nv filed Critical Philips Nv
Publication of SE8200881L publication Critical patent/SE8200881L/en

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
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • G01S1/08—Systems for determining direction or position line
    • G01S1/20—Systems for determining direction or position line using a comparison of transit time of synchronised signals transmitted from non-directional antennas or antenna systems spaced apart, i.e. path-difference systems
    • G01S1/30—Systems for determining direction or position line using a comparison of transit time of synchronised signals transmitted from non-directional antennas or antenna systems spaced apart, i.e. path-difference systems the synchronised signals being continuous waves or intermittent trains of continuous waves, the intermittency not being for the purpose of determining direction or position line and the transit times being compared by measuring the phase difference
    • G01S1/306—Analogous systems in which frequency-related signals (harmonics) are compared in phase, e.g. DECCA systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Superheterodyne Receivers (AREA)
  • Circuits Of Receivers In General (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Traffic Control Systems (AREA)

Abstract

A receiver for a navigation system such as the "Decca Navigator" system comprises an aerial (1), an aerial filter (2), a buffer amplifier (3) and a plurality of tuned amplifiers (4, 5, 6 and 7). Two balanced demodulators (8-1, 8-2), which are each controlled by two local oscillator signals of opposite phases, are connected to the output of each amplifier. The two signals (0 DEG , 180 DEG ) which control one demodulator (8-1) are in a ninety degrees phase relationship to the signals (90 DEG , 270 DEG ) which control the other demodulator (8-2). These signals are derived from a frequency synthesiser (12) which is connected to a non-synchronized source of local oscillator signals (13). Low-pass filters (14, 15) are connected to the outputs of the demodulators. The outputs of said low-pass filters are connected to a signal multiplexer (16), the output of which is connected to a A/D-converter (17). The output of said converter is connected to a processor (18). The processor converts the information of the navigation signals into position co- ordinate information. Display means (19) shows the position information in longitude and latitude. The receiver does not require a synchronised local oscillator. <IMAGE>
SE8200881A 1981-02-18 1982-02-15 NAVIGATION SIGNAL RECEIVERS SE8200881L (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8100786 1981-02-18
NL8101720A NL8101720A (en) 1981-02-18 1981-04-08 RECEIVER FOR NAVIGATION SIGNALS.

Publications (1)

Publication Number Publication Date
SE8200881L true SE8200881L (en) 1982-08-19

Family

ID=26645682

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8200881A SE8200881L (en) 1981-02-18 1982-02-15 NAVIGATION SIGNAL RECEIVERS

Country Status (9)

Country Link
AU (1) AU8051082A (en)
DE (1) DE3204591A1 (en)
DK (1) DK65682A (en)
FR (1) FR2500170A1 (en)
GB (1) GB2093310B (en)
IT (1) IT1149652B (en)
NL (1) NL8101720A (en)
NO (1) NO820450L (en)
SE (1) SE8200881L (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3602812A (en) * 1969-01-06 1971-08-31 Singer General Precision Measuring the relative phases of sequential signal bursts
US4015262A (en) * 1974-12-30 1977-03-29 Northrop Corporation Digital filters for obtaining quadrature components of a periodic signal

Also Published As

Publication number Publication date
IT8219667A0 (en) 1982-02-15
AU8051082A (en) 1982-08-26
NO820450L (en) 1982-10-11
IT1149652B (en) 1986-12-03
GB2093310B (en) 1984-08-30
GB2093310A (en) 1982-08-25
DE3204591A1 (en) 1982-10-28
NL8101720A (en) 1982-09-16
DK65682A (en) 1982-08-19
FR2500170A1 (en) 1982-08-20

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