摘要:
A method for evaluating a distance between at least a first antenna unit and a second antenna unit by two- way transmission of at least two signals having different circular polarizations between the antenna units. Phase information is determined and used to determine at least a first phase sum and a second phase sum, where the phase sums are further utilized in determination of at least one distance indicator that is indicative of the distance between the first antenna unit and the second antenna unit.
摘要:
There is described a FMCW radar system able to identify active targets. The system comprises an interrogator radar and radio frequency tag. The tag comprise a transmitter adapted to transmit a binary code through transmission of a series of different discrete fixed frequencies selected from a set of more than two discrete fixed frequencies; The interrogator radar is configured to be switchably operable between a first mode and a second mode. In the first mode the interrogator generates and transmits a FMCW signal in order to identify the presence of passive objects within its field of regard. In the second mode the interrogator radar transmits a relatively fixed frequency signal compared with the FMCW signal, and mixes relatively fixed frequency signal with the series of discrete fixed frequencies received from the tag to identify the binary code.
摘要:
무선랜(Wireless Local Area Network) 시스템에서, 센싱 세션(sensing session)은 제1 버스트(burst) 및 제2 버스트를 포함하고, 송신 STA은 상기 제1 버스트에서 상기 송신 STA이 제1 수신 STA 및 제2 수신 STA에게 제1 사운딩 신호를 전송할 수 있다. 송신 STA은 상기 제1 버스트에서 상기 제1 수신 STA으로부터 상기 송신 STA과 상기 제1 수신 STA 간의 제1 채널 정보를 포함하는 제1 피드백 프레임을 수신하고, 상기 제2 수신 STA으로부터 상기 송신 STA과 상기 제2 수신 STA 간의 채널 정보를 포함하는 제2 피드백 프레임을 수신할 수 있다. 송신 STA은 상기 제2 버스트에서 상기 제1 수신 STA으로부터 제2 사운딩 신호를 수신할 수 있다. 송신 STA은 상기 제2 버스트에서 상기 제2 수신 STA으로부터 상기 제1 수신 STA과 상기 제2 수신 STA 간의 채널 정보를 포함하는 제3 피드백 프레임을 수신할 수 있다.
摘要:
무선랜 시스템에서 WiFi 센싱을 수행하는 방법 및 장치가 제안된다. 구체적으로, 제1 STA은 제2 STA으로부터 물체에 대한 채널 측정을 요청하는 제1 패킷을 수신한다. 제1 STA은 제1 패킷을 기반으로 센싱 시퀀스를 생성한다. 제1 STA은 센싱 시퀀스를 전송하고 수신하여 채널 측정을 수행한다. 제1 STA은 채널 측정의 결과를 보고하는 제2 패킷을 제2 STA에게 전송한다.
摘要:
Es wird ein System zur Identifizierung und Lokalisierung eines Objekts (Z) beschrieben. Das System (10, 20) weist ein bistatisches FMCW-Radarsensorsystem mit mindestens zwei FMCW- Radarsensoren (R1, R2) auf, welches kohärent oder quasi-kohärent betreibbar ausgebildet ist und dazu ausgebildet ist eine Serie von sich wiederholenden Rampensignalen zu emittieren. Zudem umfasst das System einen aktiven RFID-Transponder (40), welcher an einem zu identifizierenden und zu lokalisierenden Objekt (Z) angeordnet ist und dazu eingerichtet ist, ein moduliertes bistatisches Rückstreusignal (RB, SIF,1,bi) zu erzeugen, wobei ein von einem der mindestens zwei Radarsensoren (R1, R2) mit einer Rampenwiederholfrequenz (f) ausgesendetes Rampensignal mit einem Amplitudenmodulationssignal, dessen vorbekannte Modulationsfrequenz (fmod) kleiner als die halbe Rampenwiederholfrequenz ist, moduliert wird. Teil des Systems ist auch eine Auswertungseinheit (100, 100a), welche dazu eingerichtet ist, auf Basis des modulierten bistatischen Rückstreusignals (RB, SIF,1,bi) durch zwei Fouriertransformationen des modulierten Rückstreusignals (RB, SIF,1,bi) nach der Frequenz (f) und nach der Amplitude (A) eine Zuordnung zwischen einer Beatfrequenz und der vorbekannten Modulationsfrequenz (fmod) des aktiven RFID-Transponders (40) durchzuführen. Es wird auch ein Verfahren zur Identifizierung und Lokalisierung und Geschwindigkeitsmessung eines Objekts (Z) beschrieben.
摘要:
An emergency rescue equipmenthaving a harmonic reflector circuit comprising an antenna connected to a non-linear circuit via a matching circuitand a casing that in part enclose the harmonic reflector circuit, wherein the harmonic reflector circuit is configured to receive a signal at a receive frequency (fRX), and configured to transmit said received signal at a transmit frequency (fTX), where the transmit frequency is a multiple of the receive frequency, the harmonic reflector circuit wherein the receive frequency (fRX) is in an interval from a first frequency to a second frequency, where the first frequency is at least 800 MHz; andthe second frequency is at least 34 MHz larger than the first frequency;the received signal is transmitted at the transmit frequency (fTX) with an output power (Pout) of at least 70% of the maximum available output power (Pmax).
摘要:
L'invention concerne un procédé (METH) de mesure d'une distance R séparant un véhicule (V) et un identifiant (I) pour accéder et démarrer le véhicule (V), le véhicule (V) et l'identifiant (I) étant synchronisés, le procédé (METH) comprenant : - une sélection (Sel_f p ) de N fréquences f p , pϵ[1;N], N étant un entier naturel au moins supérieur à 3 - une mise en œuvre de N séquences Sq p , chaque séquence Sq p comprenant les étapes suivantes : • une transmission (Em_S vp ), d'un émetteur (TXv) du véhicule (V) à un récepteur (Rxi) de l'identifiant (I), d'un premier signal (S vp ) de fréquence f p • une mesure (Mes_ ϕ vip ), par un calculateur (Xi) de l'identifiant (I), d'une phase ϕ vip , modulo 2π, du premier signal (S vp ) reçu, relativement à un deuxième signal (S ip ) de phase ϕ ip (t) = ϕ 0ip + 2πf p t • une transmission (Em_S ip ), d'un émetteur (TXi) de l'identifiant (I) à un récepteur (RXv) du véhicule (V), du deuxième signal (S ip ) • un calcul (Mes_ ϕ iv p ), par un calculateur (Xv) du véhicule (V), d'une phase ϕ ivp , modulo 2π, du deuxième signal (S ip ) reçu, relativement au premier signal (S vp ) • un calcul (Cal_ϕ p ) de la moyenne ϕ p de la phase ϕ vip et de la phase ϕ ivp - pour chaque p entre 1 et N-1, un calcul (Cal_P p ) d'une pente P p par la formule P p =(ϕ p +1 -ϕ p )/(f p+1 -f p ) - un calcul (Cal_R) de la distance R à partir des pentes P p , pϵ[1;N].
摘要:
We describe a sensor system for measuring relative distance between sensors of the system, the sensor system comprising at least two sensors, wherein each said sensor comprises an RF transceiver coupled to a microprocessor and stored program code for controlling the microprocessor, wherein said stored program code comprises code to: send, using said RF transceiver a group of one or more data bits from the sensor to a second sensor; receive, using said RF transceiver, an acknowledgement of reception of said group of data bits from said second sensor; determine a time difference between said sending and said receiving; compensate said time difference from a processing delay by the microprocessor of said second sensor between the second sensor receiving said group of data bits and sending said acknowledgement, to determine timing data reprinting distance to said second sensor.
摘要:
A system is provided for wirelessly locating objects. The system has a transceiver unit with an antenna array of two partially overlapping coils, which is used in combination with a passive electromagnetic reflector to track or locate the objects. The system is tuned to reflect and receive higher order harmonics of a transmitted signal frequency. The system is reliable in a highly reflective environment with no placement error detection due to reflections. A relatively large distance can be bridged with a minimum power and a small sensitive area to detect the coils, which increase the accuracy to determine the location of the electromagnetic reflector.
摘要:
System, umfassend ein Fahrzeug (1) mit einer automatischen, funkbasierten Fahrzeugsicherungseinheit (100) und mit einem Zugangssteuergerät (102) und umfassend ein der Fahrzeugsicherungseinheit zugeordnetes Zugangselement (101), wobei die Fahrzeugsicherungseinheit mehrere niederfrequente Sendeantennen aufweist und das Zugangselement einen niederfrequenten Empfänger aufweist und durch das Zugangssteuergerät die räumliche Position des Zugangselements relativ zum Fahrzeug durch das Prinzip der elektromagnetischen Abstands- und Winkelmessung zwischen den Sendeantennen und dem Empfänger ermittelbar ist, wobei das System eine fahrzeugexterne Induktionsladeeinheit (3) mit einer Primärspule (4) umfasst, das Fahrzeug eine Sekundärspule (2) zum induktiven Laden des Fahrzeugs an der Induktionsladeeinheit umfasst, die Induktionsladeeinheit mindestens eine niederfrequente Empfangsantenne aufweist, und von dem Zugangssteuergerät eine Ermittlung der Ortsposition der Induktionsladeeinheit relativ zum Fahrzeug durch das Prinzip der elektromagnetischen Abstands- und Winkelmessung zwischen mindestens zwei Sendeantennen der mehreren niederfrequenten Sendeantennen und der mindestens einen Empfangsantenne durchführbar ist.