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FMCW radar system

A technology of radar system and digital processing unit, which is applied in the direction of radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., which can solve the problem that the possibility of fault detection has negative effects, etc.

Active Publication Date: 2016-08-31
SIEMENS AG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of these consequences in complex filter designs have a negative impact on the probability of fault detection

Method used

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  • FMCW radar system

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Embodiment Construction

[0017] The figure shows a functional block diagram of an FMCW radar system for measuring the distance of a target 1 , such as the fill level of a substance in a container. The system comprises a transmit / receive unit 2 for generating a frequency-modulated signal 3 to be transmitted to the target 1 and for mixing an echo signal 4 received from the target 1 with the frequency-modulated signal 3 to generate a beat signal 5 . To this end, a function generator 6 periodically generates a linear, eg triangular or sawtooth-shaped modulation function 7 for controlling a voltage-controlled microwave oscillator 8 generating a frequency-modulated signal 3 . The microwave signal 3 is supplied via a circulator or directional coupler 9 to an antenna 10 from which it is transmitted as a transmission signal 11 to the target 1 . The echo 12 from the target 1 is received by the antenna 10 as an echo signal 4 after a propagation time proportional to the measured distance. The received echo signa...

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Abstract

A frequency-modulated continuous-wave (FMCW) radar system for level or distance measurement in which a frequency modulated signal to be transmitted to a target is mixed with an echo signal from the target to produce a beat signal that passes through an analog filter before being digitized and processed in a digital processor to determine the level or distance to be measured, where a test signal is generated by a signal generator, and a switch is controlled to connect the beat signal or the test signal to the analog filter, the signal generator generates the test signal as a broadband signal having a periodic waveform, e.g., a square wave, and the digital processor calculates a spectrum of the digitized filtered test signal by Fast Fourier Transform and generates a fault signal if the spectrum differs from a reference spectrum by a predetermined amount to allow for failure detection.

Description

technical field [0001] The present invention relates to an FMCW radar system for level or distance measurement, the FMCW radar system comprising: a transmitting / receiving unit for generating a frequency-modulated signal to be transmitted to a target and for combining an echo signal received from the target with The generated FM signals are mixed to produce a beat signal; an analog filter unit for filtering the beat signal; a digital processing unit for digitizing and processing the filtered and digitized beat signal to determine the level or distance to be measured; A signal generator controlled by the digital processing unit for generating a test signal, and a switching unit controllable to connect the beat signal or the test signal to the analog filter unit. Background technique [0002] An FMCW radar system is known from WO2013 / 164456A1. Since the amplitude of echoes in the short measurement range of the system is much higher than echoes from farther away, the analog fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40G01S13/34
CPCG01S7/4052G01S7/4056G01S13/343G01S13/345G01S7/406G01F23/284G01S13/34G01S7/4073G01S13/931G01S3/48
Inventor 艾伦·阿斯利特约翰内斯·特奥多鲁斯·科内利斯·杜文瓦登刘静米海-加布里埃尔·塞班
Owner SIEMENS AG
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