摘要:
A method of locating an object by wave energy reflection and an apparatus therefor in which receiving outer transducers (11R, 11L or 111R, 111L) provide directional receptivities represented by polar lobes diverging on opposite sides of a reference axis (15) and an inner receiving transducer (13 or simulated from 111R, 111L) provide a directional receptivity represented by a narrower polar lobe centered on the reference axis. The signals received from the outer transducers (11R, 11L or 111R, 111L) are operated upon in channels (II, 111) of the receiver to modulate them with a frequency swept local signal derived from the transmitted signal and develop indicator signals of difference frequency between the transmitted and received frequencies and which represent the range of the object. The outer signals are displayed binaurally, to enable the user to achieve firstly approximate directional sensing by binaural effect, and thereafter more accurate directional sensing by the use of signals developed in a central channel (IV) and derived from the inner transducer (13) or outer transducers (111R, 111L) simulating an inner transducer. Gain in channels (11 and III) fed from the outer transducers is preferably adjusted as an inverse function of signal strength in the channel (IV). Higher frequency components are preferably accentuated in the inner channel to improve object character recognition.
摘要:
Es wird eine Vorrichtung zur Umfeldsensorik vorgeschlagen, die einen Wandler zur Wandlung elektrischer Signale in Sendesignale, einen Signalgenerator zur Erzeugung der elektrischen Signale und eine Empfangsverstärkereinrichtung zur Verstärker vom Wandler empfangener Signale umfasst. Erfindungsgemäß wird eine Vielzahl von Impedanzen vorgesehen, wobei die Vorrichtung eingerichtet ist, eine Impedanz aus der Vielzahl von Impedanzen auszuwählen und die Ausgangssignalstärke der Empfangsverstärkereinrichtung mittels der ausgewählten Impedanz anzupassen.
摘要:
The invention relates to an ultrasonic measurement system for detecting an obstacle by means of a resonant transformer element, for transmitting an ultrasonic pulse and for generating a received signal comprising the ultrasonic echo pulse reflected by the obstacle, wherein the transformer element generates an oscillation signal at the resonance frequency thereof after transmission of the ultrasonic pulse. The ultrasonic measurement system comprises an analysis unit having a control device that is designed to actuate the transformer element for transmitting the ultrasonic pulse by means of a frequency- modulated transmission signal generated by the control device, wherein the frequency modulation takes place by means of a modulation signal so that the signature of the ultrasonic pulse is different from that of the oscillation signal. The analysis unit is designed to detect the echo pulse using an analysis of at least one correlation signal generated by means of at least one correlation filter and originating from the correlation of the signal generated by the resonant transformer element to the transmission signal. The invention further relates to a corresponding method for detecting an obstacle by means of ultrasound, and to a vehicle assistance system having the ultrasonic measurement system.
摘要:
Es wird eine Vorrichtung zur Umfeldsensorik vorgeschlagen, die einen Wandler zur Wandlung elektrischer Signale in Sendesignale, einen Signalgenerator zur Erzeugung der elektrischen Signale und eine Empfangsverstärkereinrichtung zur Verstärker vom Wandler empfangener Signale umfasst. Erfindungsgemäß wird eine Vielzahl von Impedanzen vorgesehen, wobei die Vorrichtung eingerichtet ist, eine Impedanz aus der Vielzahl von Impedanzen auszuwählen und die Ausgangssignalstärke der Empfangsverstärkereinrichtung mittels der ausgewählten Impedanz anzupassen.