Circular polarized angle of arrival measurement system
An antenna system, extreme technology, applied in the field of circularly polarized angle-of-arrival measurement systems
Pending Publication Date: 2021-02-19
DENSO INTERNATIONAL AMERICA +1
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[0008] However, the antenna system of the current PEPS system may prevent the PEPS system from accurately estimating RSSI power, distance and angle of RSSI power, differential RSSI power, trilateration, triangulation for signal transmission between the smart key terminal and the vehicle and associated fingerprint location values
The antenna system of the current PEPS system may also prevent the PEPS system from accurately estimating the location of the key fob relative to the vehicle
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[0083] Antennas that receive and / or transmit in a linear polarization pattern having a typical "doughnut" shape cannot be placed near metal in a vehicle because the antenna and metal form a combined antenna system. The metal of the vehicle can electromagnetically short the antenna, reducing link margin. Link margin refers to the amount of power required in a received signal to distinguish, for example, 1s from 0s of the received signal.
[0084] Linearly polarized antennas in typical microlocation systems have small link margins when the antennas are cross-polarized with antennas in smart keys or smart devices. The antenna of the smart key is usually a linearly polarized antenna. The power transmitted over the link and in a particular direction varies widely as the orientation of the linearly polarized key fob antenna changes in typical reflective environments. This degrades micropositioning performance in PEPS systems. The circularly polarized quadrifilar helical antenna e...
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Methods and systems are disclosed and include receiving a signal via a first communication channel at a plurality of azimuth angles. The method includes determining a plurality of first communicationchannel phase angle differences between a pair of antennas. The method includes receiving a second signal via a second communication channel and at the plurality of azimuth angles. The method includesdetermining a plurality of second communication channel phase angle differences between the pair of antennas that each correspond to one of the plurality of azimuth angles. The method includes generating a first reference curve based on the plurality of first communication channel phase angle differences. The method includes generating a second reference curve based on the plurality of second communication channel phase angle differences. The method also includes generating a calibration curve that is based on an interpolation of the first reference curve and the second reference curve.
Description
[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Utility Application No. 16 / 445,468, filed June 19, 2019, and to U.S. Provisional Application No. 62 / 687,485, filed June 20, 2018, filed March 29, 2019 U.S. Provisional Application No. 62 / 826,111 filed on June 20, 2018; U.S. Provisional Application No. 62 / 826,129 filed on March 29, 2019; U.S. Provisional Application No. 62 / 826,129 filed on March 29, 2018; U.S. Provisional Application No. 62 / 687,633, filed June 20, 2019, and U.S. Provisional Application No. 62 / 826,145, filed March 29, 2019. The entire disclosure of the above application is incorporated herein by reference. technical field [0003] The present disclosure relates to circular polarization angle of arrival measurement systems and methods. Background technique [0004] This section provides background information related to the present disclosure and is not necessarily prior art. [0005] A traditional passive entry...
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IPC IPC(8): H04B7/08
CPCH04B7/0897B60R25/245B60R25/40G07C9/00309G07C2009/00793H01Q1/3241H01Q1/362H01Q11/08H01Q19/10H01Q3/36H01Q21/29G01S3/043G01S3/48B60R25/209B60R25/24H01Q11/083H01Q21/0043H04W88/02
Inventor 雷蒙德·迈克尔·斯蒂特J·维德蒂克W·格思里K·亚格尔T·彼得森
Owner DENSO INTERNATIONAL AMERICA