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1. WO1996003689 - SPREAD SPECTRUM LOCALIZERS

Publication Number WO/1996/003689
Publication Date 08.02.1996
International Application No. PCT/US1995/009379
International Filing Date 19.07.1995
Chapter 2 Demand Filed 23.01.1996
IPC
G01S 1/00 2006.01
GPHYSICS
01MEASURING; TESTING
SRADIO 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
1Beacons 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
G01S 13/87 2006.01
GPHYSICS
01MEASURING; TESTING
SRADIO 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
13Systems 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
87Combinations of radar systems, e.g. primary radar and secondary radar
G01S 5/00 2006.01
GPHYSICS
01MEASURING; TESTING
SRADIO 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
5Position-fixing by co-ordinating two or more direction or position-line determinations; Position-fixing by co-ordinating two or more distance determinations
G01S 5/14 2006.01
GPHYSICS
01MEASURING; TESTING
SRADIO 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
5Position-fixing by co-ordinating two or more direction or position-line determinations; Position-fixing by co-ordinating two or more distance determinations
02using radio waves
14Determining absolute distances from a plurality of spaced points of known location
CPC
G01S 1/026
GPHYSICS
01MEASURING; TESTING
SRADIO 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
1Beacons 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
02using radio waves
022Means for monitoring or calibrating
026of associated receivers
G01S 1/045
GPHYSICS
01MEASURING; TESTING
SRADIO 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
1Beacons 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
02using radio waves
04Details
045Receivers
G01S 11/02
GPHYSICS
01MEASURING; TESTING
SRADIO 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
11Systems for determining distance or velocity not using reflection or reradiation
02using radio waves
G01S 13/876
GPHYSICS
01MEASURING; TESTING
SRADIO 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
13Systems 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
87Combinations of radar systems, e.g. primary radar and secondary radar
876Combination of several spaced transponders or reflectors of known location for determining the position of a receiver
G01S 5/0063
GPHYSICS
01MEASURING; TESTING
SRADIO 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
5Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
0009Transmission of position information to remote stations
0045Transmission from base station to mobile station
0063of measured values, i.e. measurement on base station and position calculation on mobile
G01S 5/0072
GPHYSICS
01MEASURING; TESTING
SRADIO 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
5Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
0009Transmission of position information to remote stations
0072Transmission between mobile stations, e.g. anti-collision systems
Applicants
  • AETHER WIRE & LOCATION [US/US]; 5950 Lucas Valley Road Nicasio, CA 94946, US
Inventors
  • FLEMING, Robert, Alan; US
  • KUSHNER, Cherie, Elaine; US
Agents
  • BALDWIN, Stephen, E. ; Poms, Smith, Lande & Rose Suite 3800 2029 Century Park East Los Angeles, CA 90067, US
Priority Data
279,32922.07.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) SPREAD SPECTRUM LOCALIZERS
(FR) LOCALISEURS A SPECTRE ETALE
Abstract
(EN)
A network of localizers (100) determines relative locations in three-dimensional space to within 1 cm by cooperatively measuring propagation times of pseudorandom sequences of electromagnetic impulses. The propagation time is determined from a correlator (114) which provides an analog pseudo-autocorrelation function sampled at discrete time bins. The correlator has a number of integrators (1430), each integrator providing a signal proportional to the time integral of the product of the expected pulse sequence delayed by one of the discrete time bins, and the non-delayed received antenna signal. With the impulses organized as doublets the sampled correlator output can vary considerably in shape depending on where the autocorrelation function peak falls in relation to the nearest bin. Using pattern recognition the time of arrival of the received signal can be determined to within a time much smaller than the separation between bins. Because operation of standard CMOS circuitry generates noise over a large frequency range, only low-noise circuitry operates during transmission and reception. To provide the time accuracy necessary for distancing, a high-frequency clock (120) operates during inter-localizer communications. The high-frequency clock uses a PLL circuit to increase the clock rate and a programmable delay to provide finer time graduations.
(FR)
Réseau de localiseurs (100) permettant de déterminer dans un espace à trois dimensions au centimètre près, des positions relatives en mesurant conjointement les temps de propagation de séquences pseudoaléatoires d'impulsions électromagnétiques. Les temps de propagation sont déterminés à l'aide d'un corrélateur (114) qui fournit une fonction de pseudoautocorrélation échantillonnée dans des créneaux de synchronisation discrets. Le corrélateur présente un certain nombre d'intégrateurs (1430) fournissant chacun un signal proportionnel à l'intégrale temporelle du produit de la séquence d'impulsions attendue retardée de l'un des créneaux de synchronisation discrets, ainsi que le signal d'antenne non retardé. Si les impulsions sont émises sous forme de doublets, la sortie du corrélateur échantillonné peut varier considérablement par la forme selon l'endroit où tombe le pic de la fonction d'autocorrélation correspondant au créneau le plus proche. En recourant à la reconnaissance des formes, il est possible de déterminer l'instant d'arrivée du signal reçu à l'intérieur d'un laps de temps nettement plus petit que l'intervalle entre créneaux. Comme le fonctionnement des cricuits CMOS usuels produit des bruits sur une large plage de fréquence, seuls les circuits à faible bruit fonctionnent pendant l'émission et la réception. Pour obtenir la précision en temps nécessaire pour le calcul des distances, on utilise pendant les communications entre localiseurs une horloge à haute fréquence (120) comportant un circuit PLL qui accroît la fréquence d'horloge, et un retard programmable fournissant une graduation temporelle très fine.
Also published as
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