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Vehicle speed sensor

A vehicle speed, sensor technology, applied in the direction of reflection/re-radiation of instruments, radio waves, utilization of re-radiation, etc., can solve the problem of difficult Doppler frequency and signal correspondence, etc., to improve reliability, compact structure, speed and the effect of improving the accuracy of stroke measurement

Inactive Publication Date: 2006-12-27
SIEMENS AG
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Problems solved by technology

However, the spectral structure is strongly influenced by the background, and it is difficult in conventional Doppler analysis to map the characteristic Doppler frequencies dependent on the background to the signal

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[0030] The combined measurement principle exploits the disturbing effect of the spectral expansion in the MW signal in typical Doppler analysis under the extended condition of the radiation characteristics. Under constant velocity conditions, one frequency range of the signal can be unambiguously correlated with one of the MW radiation in which the instantaneous measurement of the intensity ( image 3 ) corresponding to the angle range.

[0031] If the signal is decomposed into a number of successive frequency bands, these frequency bands correspond to the angular extent of the adjacent arrangement of the MW radiation. These frequency bands respectively illuminate the separate fringe areas between the equal Doppler lines as they reach the background ( Figure 4 ). From this signal the reflectivity of all illuminated fringes can be determined simultaneously. That is to say, two broadband radiation modules ( image 3 ) corresponds to the correlation set by multiple classics ...

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Abstract

Two broad-radiating microwave transceivers are positioned one behind the other in the driving direction. Signals from the microwave transceivers are sent to an evaluation device that sends part of the signals within a specific frequency band to a correlation device.

Description

technical field [0001] The invention relates to a vehicle speed sensor. Background technique [0002] Traditionally, vehicle speed is obtained by tachometers or travel pulse generators on the wheels or axles. The insufficiency arises mainly in daily starting and braking, where the values ​​of the strong column deviations due to slipping and eccentricity are determined in this way. However, it is precisely at such times that vehicle drive and vehicle control circuits need reliable data. Based on the principle of contactless speed measurement, microwave sensors outperform optical or ultrasound-based systems in traffic technology due to their robustness. The microwave sensor for speed measurement is implemented as a Doppler radar, or a plurality of individual sensors positioned one behind the other in the direction of travel on the basis of correlated measurements. These two fundamentally different measurement methods have a series of systematic biases and sources of unrelia...

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Application Information

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IPC IPC(8): G01S13/58G01S13/60
CPCG01S7/4021G01S13/605
Inventor 克里斯·卡库施克
Owner SIEMENS AG
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