Radar apparatus

A technology of radar equipment and radar waves, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc., capable of solving problems such as false detection

Active Publication Date: 2012-07-11
DENSO CORP
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0011] In a radar apparatus that obtains information including a target position by pairing peaks of an upbeat signal Bu and a downbeat signal using the FMCM method, when digital signal processing such as fast Fourier transform (FFT) is performed, occurrences greater than the received The received signal of a target at a distance from the Nyquist frequency of the sampling frequency of the signal may be folded to a position smaller than the Nyquist frequency, and a target located at a long distance may appear at a short distance and may lead to false detections

Method used

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no. 1 example

[0075] A radar apparatus 1 according to a first embodiment of the present disclosure is described with reference to the drawings. Such as figure 1 As shown, the radar device 1 includes a transmitter 10 , a receiver 20 and a signal processor 30 .

[0076] The transmitter 10 generates a transmission signal whose frequency changes periodically with time, and outputs the transmission signal as a radar wave. Transmitter 10 includes oscillator 12 , splitter 14 and transmit antenna 16 . The oscillator 12 generates a high-frequency signal in the millimeter wave band modulated so that the frequency increases or decreases periodically. Divider 14 divides the power of the output signal of oscillator 12 into transmit signal Ss and local signal L. The transmission antenna 16 outputs radar waves based on the transmission signal Ss.

[0077] The frequency of the high-frequency signal generated by the oscillator 12 changes in a triangular wave manner. For example, the center frequency Fo...

no. 2 example

[0121] will refer to Figure 7 and Figure 8 A radar device 2 according to a second embodiment of the present disclosure is described.

[0122] Such as Figure 7 As shown, the radar device 2 includes a transmitter 10 , a receiver 200 and a signal processor 300 . The receiver 200 includes a plurality of receiving antennas 22 , a receiving device 24 , a receiver switch 26 and a selection signal generator 28 .

[0123] The receiving device 24 includes a high-frequency mixer that mixes the received signal Sr from one of the receiving antennas 22 with the local signal L, and generates a beat signal B that is a frequency component of the difference of the signals.

[0124] The receiver switch 26 selects one of the received signals Sr from the receiving antenna 22 according to the selection signal Xr, and supplies the selected received signal to the receiving device 24 . The receiver switch 26 may be a high frequency switch such as a p-intrinsic-n diode (PIN diode), a metal semic...

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Abstract

A radar apparatus (1) includes a transmitter (10), a receiver (20), and a signal processor (30). The transmitter (10) outputs a radar wave. The receiver (20) includes a plurality of receiving antennas (22) and a plurality of receiving devices (24). Each of the receiving devices (24) mixes a reception signal from the corresponding receiving antenna (22) with a local signal (L) and outputs a beat signal (B). The signal processor (30) samples the beat signal (B) while selecting one of the receiving devices (24) in order with a selecting period tc that is less than a half of a sampling period Ts. The signal processor (30) samples the beat signal (B) with the sampling period Ts and derives position information of a target by pair matching of peaks of a rising-modulation signal(Bu) and a falling-modulation signal (Rd) of the beat signal (B).

Description

technical field [0001] The present invention relates to a radar device that detects position information of an object. Background technique [0002] Radar devices are arranged in vehicles as a safety device against collisions. As an example of a radar device arranged in a vehicle, a frequency modulation continuous wave radar device (FWCW radar device) is used. FWCW radar devices are able to detect both the range of the target and the relative velocity of the target. The FWCW radar device has a simple configuration and is suitable for size reduction and cost reduction. [0003] The FM-CW radar apparatus transmits a transmission signal Ss frequency-modulated using a triangular wave so that the frequency gradually increases and decreases linearly, and receives the wave reflected by a target as a reception signal Sr. [0004] The received signal Sr delay time Td, which is the time it takes for the transmitted and received waves to travel from the radar device to the target an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/42G01S13/58G01S13/931
CPCG01S3/465G01S13/42G01S13/343G01S13/931G01S7/354G01S13/58G01S13/345
Inventor 水谷玲义夏目一马阿部好浩
Owner DENSO CORP
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