US 7,924,215 B2Granted

Radar apparatus and mobile object

AssigneeMurata Manufactruing Co., Ltd.

InventorMotoi Nakanishi

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Abstract

A signal processing circuit detects, at a plurality of different timing points, a first and a second distance of an oncoming vehicle approaching a vehicle including the radar apparatus and detects a first and a second component of a relative velocity of the vehicle in the radar-apparatus direction. A distance of closest approach of the oncoming vehicle to the vehicle appears when the vehicle and the oncoming vehicle pass each other side by side. The signal processing circuit computes the distance of closest approach on the basis of a formula indicating that a relative velocity given by the first distance, the distance of closest approach, and the first component of a relative velocity in the radar-apparatus direction is equal to a relative velocity given by the second distance, the distance of closest approach, and the second component of a relative velocity in the radar-apparatus direction.

Claims11

Dependent claims

A radar apparatus comprising:

a transmitting and receiving unit that transmits a transmission signal, receives a reflection signal of the transmission signal, and outputs a detection signal;
and
an object detecting unit that detects a distance of an object from the radar apparatus and a relative velocity of the object based on the detection signal;
wherein the object detecting unit computes a distance of closest approach r of the object at two timing points based on a change in the distance of the object from the radar apparatus and a change in a component of the relative velocity of the object in a radar-apparatus direction acquired from the detection signal, and
wherein the distance of closest approach r of the object is calculated as follows:
r
=
L
⁢
⁢
1
·
L
⁢
⁢
2
·
(
V
⁢
⁢
mod
⁢
⁢
1
2
-
V
⁢
⁢
mod
⁢
⁢
2
2
)
V
⁢
⁢
mod
⁢
⁢
1
2
·
L
⁢
⁢
1
2
-
V
⁢
⁢
mod
⁢
⁢
2
2
·
L
⁢
⁢
2
2
wherein L1 denotes a distance detected at a first timing point of the two timing points, Vmod1 denotes a component of the relative velocity in the radar-apparatus direction at the first timing point, L2 denotes a distance detected at a second timing point of the two timing points, and Vmod2 denotes a component of the relative velocity in the radar-apparatus direction at the second timing point.

63 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/212,119Filed 17 Sep 2008 · continuation
Priority: JP 2006-08573627 Mar 2006
Published: US 2009/0015462 A115 Jan 2009
Granted: 12 Apr 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

G01S 13/931
For anti-collision purposes: of land vehicles
G08G 1/166
Anti-collision systems: for active traffic, e.g. moving vehicles, pedestrians, bikes
G08G 1/167
Anti-collision systems: driving aids for lane monitoring, lane changing, e.g. blind spot detection
G01S 13/505
Systems of measurement based on relative movement of target: using Doppler effect for determining closest range to a target or corresponding time,…