Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Radar device

a technology of a radar and a distance sensor, which is applied in the direction of measurement devices, communication jamming, instruments, etc., can solve the problems of reducing the period of time during which the distance to the target and the relative velocity of the target can be measured, the control of the vehicle, and the inefficiency of the measuremen

Inactive Publication Date: 2008-05-01
MITSUBISHI ELECTRIC CORP
View PDF4 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a radar device that can detect interference signals without stopping the transmission of electromagnetic waves. It uses frequency analysis to measure the distance and relative velocity between a vehicle and an object, and can detect interference signals from other radar devices or communication devices based on signal intensity. This allows for high-speed detection of interference signals and improves radar performance.

Problems solved by technology

In this situation, although there exists the target, it is impossible to measure the distance to the target and the relative velocity of the target, which causes a problem in controlling the vehicle.
However, in the radar device which is disclosed in JP 2004-163340 A, because the transmission of the electromagnetic waves stops during the interference detecting operation, the measurement of the distance to the target and the relative velocity of the target must be suspended, which is not efficient.
Also, when the interference detecting operation is conducted with high frequency in order to enhance the sensitivity of the interference detection, there arises such a problem that a period of time during which the distance to the target and the relative velocity of the target can be measured is reduced.
However, because there is no distinction between a case where the signal intensity increases due to the receiver signal that is reflected by the target and a case where the signal intensity increases due to the interference signal, the above-mentioned method is not suitable for detecting the interference signal.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Radar device
  • Radar device
  • Radar device

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0025]FIG. 1 is a block diagram showing a configuration of a radar device according to a first embodiment of the present invention. The radar device shown in FIG. 1 represents a radar device of an FM - pulse Doppler system, and includes, as a transmitter circuit, a voltage control oscillator 1 for generating a signal according to an applied voltage waveform, a directive coupler 2 for supplying the signal that is outputted from the voltage control oscillator 1 to a transceiver circuit, an amplifier 3 for amplifying an output signal of the directive coupler 2, a transmission / reception changeover switch 4 for changing over the transmission / reception of the radar, and a transmission / reception antenna 5 for both of transmission and reception.

[0026]Also, the radar device shown in FIG. 1 includes, as a receiver circuit, a low-noise amplifier 6 for amplifying a receiver signal, a mixer 7 for mixing a receiver signal which is an output signal of the low-noise amplifier 6 with a transmitter s...

second embodiment

[0048]A second embodiment is identical in the configuration with the first embodiment except that the interference detecting unit 13 monitors whether the signal intensity in the frequency range that is not used for measurement of the distance to the target and the relative velocity of the target exceeds the threshold value or not, in the plurality of range gates that are equal to or more than a given rate, and it is determined that the interference occurs in the case where the signal intensity exceeds the threshold value in the monitored range gates.

[0049]According to the second embodiment, since it is determined whether the interference occurs or not, by using not all of the range gates, but the plurality of range gates of the given rate or more, it is possible to determine that the interference occurs with a high precision and at a higher speed than that of the first embodiment.

third embodiment

[0050]A third embodiment is identical in the configuration with the first embodiment except that the interference detecting unit 13 monitors whether the signal intensity in the frequency range that is not used for measurement of the distance to the target and the relative velocity of the target exceeds the threshold value Ith or not, in a given range gate, and it is determined that the interference occurs in the case where the signal intensity exceeds the threshold value in the monitored range gate.

[0051]In the case where the longest distance range gate is used as the given range gate, the maximum frequency fb_max(n) (Hz) of the beat signal which is used for measurement of the distance to the target and the relative velocity of the target is the largest. Therefore, because the frequency range that is not used for measurement of the distance to the target and the relative velocity of the target is narrow, that is, a range in which the interference is monitored is narrow, the amount o...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A radar device is mounted on a vehicle, for detecting an object, and includes: a transmitting unit for transmitting an electromagnetic wave as a transmitter signal; a receiving unit for receiving a reflected signal that is reflected from the object as a receiver signal; a signal processing unit for measuring a distance and a relative velocity between the vehicle and the object on the basis of a beat signal that is obtained by the transmitter signal and the receiver signal; and an interference detecting unit for detecting the interference signal from another radar device or a communication device on the basis of a signal intensity of the frequency range that is not used for measuring the distance to the object and the relative velocity of the object.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a radar device that is mounted on a vehicle for detecting an object (target) such as a preceding vehicle that exists around an own vehicle and measuring a distance thereof from the own vehicle and a relative velocity of the object with respect to the own vehicle.[0003]2. Description of the Related Art[0004]A radar device installed on an own vehicle transmits an electromagnetic wave as a transmitter signal, receives a reflected signal that is reflected by a target such as a preceding vehicle as a receiver signal, and calculates a distance and a relative velocity between the own vehicle and the target on the basis of a frequency analysis result with respect to a difference between the transmitter signal and the receiver signal. The radar device is used in an obstacle proximity warning system, an inter-vehicle distance control system, or a traffic jam following system.[0005]In the radar dev...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): G01S13/00G01S13/931
CPCG01S7/023G01S13/931G01S13/26G01S13/18
Inventor AKITA, KENICHINAKAGAWA, KADO
Owner MITSUBISHI ELECTRIC CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com