Wen Kuei Lin

US Patent:

6784831, Aug 31, 2004

Filed:

May 5, 2003

Appl. No.:

10/429492

Inventors:

James June-Ming Wang - San Marino CA
Wen Yen Lin - Arcadia CA

Assignee:

TIA Mobile, Inc. - Pasadena CA

International Classification:

G01S 502

US Classification:

34235712, 34235706, 342372, 701213

Abstract:

An improved GPS signal receiver (and corresponding method of operation) includes a plurality of antenna elements each receiving a plurality of GPS signals (e. g. , GPS LI signals or GPS L2 signals). A plurality of mixers (which correspond to the array of antenna elements) and a combining node convert the GPS signals received at the antenna elements in a frequency-division-multiplexed (FDM) manner over FDM frequency bands logically assigned to the antenna elements to produce a composite signal representing such GPS signals. An analog-to-digital converter converts an analog signal derived from the composite signal (which may be an intermediate frequency signal or a baseband signal) into a digital word stream. Demultiplexing logic extracts GPS signal components in the digital word stream. The GPS signal components correspond to the FDM frequency bands logically assigned to the antenna elements.

US Patent:

7123876, Oct 17, 2006

Filed:

Nov 1, 2001

Appl. No.:

10/016233

Inventors:

James June-Ming Wang - San Marino CA, US
ChauChin Yang - Los Angeles CA, US
Wen Yen Lin - Arcadia CA, US

Assignee:

Motia - Pasadena CA

International Classification:

H04B 7/14

US Classification:

455 25, 455 133, 455 132, 455 19, 455 634, 4551151, 4551152, 455 121, 342354, 342372, 342373, 342374, 342359, 342757

Abstract:

A low profile, vehicle mounted, in-motion tracking, satellite antenna includes a pair of antenna assemblies mounted in parallel on a rotatable platform. Each antenna assembly includes two subreflectors with a plastic matching element. The outputs of the two antenna assemblies are coupled with a single phase shifter. The combined outputs are retransmitted to a receiver inside the vehicle. The satellite antenna also includes a receiver for receiving channel selection data and/or for providing two-way communication with equipment inside the vehicle. The antennae, transmitter and receiver are self-powered by a storage device which is charged by a wind driven generator. A retractable radome lowers to a lower profile when the antenna is not in use.