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Method for operating a MIMO radar

A radar and motion technology, applied in the direction of using re-radiation, radio wave reflection/re-radiation, measuring devices, etc., can solve the problems of high cost, complex hardware, inaccurate angle estimation, frequency modulation continuous wave radar, etc.

Active Publication Date: 2014-12-03
ROBERT BOSCH GMBH
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  • Claims
  • Application Information

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Problems solved by technology

However, the proposed system can only implement inaccurate angle estimation and furthermore cannot be used at all with frequency modulated continuous wave radars (English: frequency modulated continuous wave (FMCW)) with long slopes
Besides, based on the Chirp sequence principle with fast frequency changes, the hardware must be relatively complex and costly to implement

Method used

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  • Method for operating a MIMO radar

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Embodiment Construction

[0058] In order to be able to take advantage of the advantages of MIMO radar, the transmitted signals used are preferably mutually orthogonal, that is to say independent of each other. In principle, there are three possibilities for this, but they each have specific disadvantages:

[0059] Code division multiplexing in fast or slow time with high technical effort or only limited orthogonality

[0060] Frequency-division multiplexing causes wavelength-dependent phase shift and Doppler shift

[0061] • Time division multiplexing leads to different phases between handovers in case of object motion, which makes subsequent angle estimation difficult.

[0062] In the following, only the time-division multiplexing method will be considered further, since this method is relatively simple to realize in terms of circuit technology and is therefore cost-effective. According to the invention, a time-division multiplexing switching scheme is proposed, which is characterized in that objec...

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Abstract

In a method for operating a MIMO radar, an influence of an object motion on an angle estimate is substantially eliminated, and a time multiplex schema having a transmission sequence and transmission instants of transmitters of the MIMO radar is identified by optimizing the following mathematical relationship: d _ pulses , opt = arg   max d _ pulses  [ Var S  ( d _ pulses ) - ( Cov S  ( d _ pulses , t ) ) 2 / Var S  ( t _ ) ] in which: dpulses,opt is optimized positions of the transmitters in the sequence in which they transmit; dpulses is positions of the transmitters in the sequence in which they transmit; t is transmission instants; VarS is sample variance; and CovS is sample covariance.

Description

technical field [0001] The invention relates to a method for operating a MIMO (Multiple Input Multiple Output) radar. The invention also relates to the use of MIMO radars in the motor vehicle sector. Background technique [0002] Radar systems are used in motor vehicles in order to determine the distance and relative speed of objects in the vicinity of the motor vehicle. The mentioned radar systems can be used for comfort functions such as Adaptive Cruise Control (ACC) and safety functions such as warning the driver in critical situations or prompting full brake). [0003] For these applications, the distance and relative velocity of the object as well as the angle of the reflected radar wave must be ascertained precisely. For this purpose, in particular the estimation of the angle (direction of arrival (DOA): direction of arrival) should be carried out accurately. The angle to be estimated can be an azimuth and / or an elevation angle. MIMO radar systems with multiple tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S13/931
CPCG01S13/02G01S7/35G01S13/003G01S13/42G01S13/931G01S7/4008G01S13/343G01S7/4034G01S7/403
Inventor M·朔尔G·屈恩勒K·兰巴赫B·勒施
Owner ROBERT BOSCH GMBH
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