Method and device for detection of surroundings
In a method and a device for detecting the surroundings, carrier waves in the form of transmission pulses are transmitted by at least one transducer, and reflections of the pulses are detected by the pulse-echo method. In this manner, the successive transmission pulses of one transducer or various transducers operated at the same time are differentiable by individual signal modulation.
1. A method for detection of surroundings by using carrier waves transmitted by at least one transducer and detecting reflections of the transmitted carrier waves by a pulse-echo technique, comprising:
transmitting a pulse of a first type by a first transducer using a carrier wave for a pulse length;
transmitting a pulse of a second type by one of the first transducer or another transducer, wherein the pulse of the first type differs from the pulse of the second type in modulations of the respective carrier waves; and
differentiating a reflection of the pulse of the first type from a reflection of the pulse of the second type on the basis of the different modulations.
2. The method as recited in claim 1 , wherein the first transducer transmits the pulses of the first and second types.
3. The method as recited in claim 2 , wherein the reflection of a pulse is detected respectively by the same transducer which transmitted the pulse.
4. The method as recited in claim 3 , wherein the reflection of a pulse is additionally detected by at least one neighboring transducer.
5. The method as recited in claim 1 , wherein the pulses of the first and second types are transmitted by different transducers.
6. The method as recited in claim 1 , wherein the modulation is one of analog amplitude modulation or digital amplitude modulation.
7. The method as recited in claim 1 , wherein the modulation is one of analog angle modulation or digital angle modulation.
8. The method as recited in claim 7 , wherein the modulation uses Manchester coding.
9. The method as recited in claim 1 , wherein the modulation is digital modulation in the form of a coding.
10. The method as recited in claim 9 , wherein the digital modulation uses Hamming coding.
11. The method as recited in claim 1 , wherein the pulses of the first and second types additionally differ from one another in using different carrier waves.
12. The method as recited in claim 1 , wherein ultrasonic waves are used as the carrier waves.
13. A method for detection of surroundings, comprising:
transmitting a first pulse of a first type;
transmitting a second pulse of the first type after at least a predefined measurement interval following the transmitting of the first pulse, wherein arrival of a reflection of the first pulse at a transducer is to be expected; and
transmitting, during the predefined measurement interval, a pulse of a second type differing from the pulses of the first type in modulation.
14. The method as recited in claim 13 , further comprising:
transmitting, before the predetermined measurement interval has elapsed, at least one pulse of a third type differing from the pulses of the first type and the second type in modulation.
15. The method as recited in claim 14 , wherein at least three ultrasonic transducers are used in parallel.
16. A device for detection of surroundings, comprising:
at least one ultrasonic transducer configured to transmit pulses;
a central unit configured to allocate different modulations to at least one of different transmission times and different transducers;
at least one ultrasonic transducer configured to detect reflections of transmitted pulses; and
an evaluation unit configured to analyze reflection times for the transmitted pulses, taking into account at least one of different modulations, different transducers and different times of transmission of the respective pulses.