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Unit-level Digital Cancellation Method for Vehicle-mounted Continuous Wave Radar

A digital cancellation, unit-level technology, applied in the reflection/re-radiation of radio waves, the use of re-radiation, radio wave measurement systems, etc., can solve the problems affecting the detection of weak and small targets, and achieve the effect of improving the cancellation ability.

Active Publication Date: 2019-02-15
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0004]The object of the present invention is to provide a kind of direct wave cancellation method based on unit level digitization, solve the problem that the direct wave signal radiated by the radar transmitting antenna in the unmanned driving system is received Antenna reception, which affects the detection of weak and small targets

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  • Unit-level Digital Cancellation Method for Vehicle-mounted Continuous Wave Radar

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Embodiment 1

[0039] In order to verify the effectiveness of the method of the present invention, the following experiments were carried out.

[0040] In unmanned driving, the radar that monitors the vehicle in front is generally installed in the front of the vehicle, and its beam is generally fixed in the normal direction of the array and its vicinity, which is used to detect and track targets on the road ahead of the vehicle. Since the vehicle-mounted millimeter-wave radar adopts the continuous wave working mode, the transmitting antenna and receiving antenna of the radar are separated in two areas of the space of the radar RF module, generally left and right. In order to characterize the method in the present invention, it is assumed that the transmit antenna and the receive antenna form according to figure 2 As shown, the number of transmitting antenna units M=6, the number of receiving antenna units N=4, the steps of the unit-level digital cancellation method of the vehicle-mounted co...

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Abstract

The invention discloses a unit-level digital cancellation method for vehicle-mounted continuous wave radar. A coupling transfer matrix is obtained by coupling measurement of a transmitting unit and areceiving unit in turn. Aiming at the demand of vehicle-mounted continuous wave radar for road target surveillance in front of a vehicle, the method mainly focuses on the normal direction. Under the condition that the beam is basically on the normal direction, the transmitting amplitude and phase weight vectors are determined according to the constraint conditions. Based on the coupling transfer matrix and the transmitting amplitude and phase weight vectors, the receiving amplitude and phase weight vectors are calculated according to the constraint conditions. Finally, the transmitting weightcoefficient and the receiving weight coefficient are used as the weighting coefficients of the continuous wave radar to form the transmitting and receiving beams of the radar. The invention reduces the direct wave influence between the transmitting antenna and the receiving antenna through the unit-level digital cancellation technology.

Description

technical field [0001] The invention relates to an electronic engineering system, in particular to a unit-level digital cancellation method applied to a vehicle-mounted continuous wave radar. Background technique [0002] As the level of unmanned driving continues to increase, the types and quantities of sensors required are also increasing. In high-level unmanned driving, vehicle-mounted millimeter-wave radar, as an important sensor device, has a good penetration detection ability for rain and fog, and is suitable for various complex weather environments. It has gradually become the basic One of the configurations. At present, the millimeter-wave radar for unmanned vehicles uses a continuous wave working system, that is, the radar is also receiving echo signals while transmitting. Moreover, the vehicle-mounted millimeter-wave radar mainly detects the target directly in front of the vehicle, and the beam is directed in the normal direction (that is, perpendicular to the ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/02G01S7/02
CPCG01S7/02G01S13/02
Inventor 沈伟
Owner NANJING UNIV OF SCI & TECH
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