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Method and system for determining a position of a transceiver unit utilizing two-way ranging in a polystatic satellite configuration including a ground radar

  • US 6,340,947 B1
  • Filed: 12/22/2000
  • Issued: 01/22/2002
  • Est. Priority Date: 02/21/1997
  • Status: Expired due to Term
First Claim
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1. A method for determining position of an object using a ground radar and first and second satellites located in a field of view of the object, wherein the first and second satellites are separated from the object and the ground radar in a substantially vertical plane, the method comprising:

  • transmitting a first ranging signal from the ground radar directly to the object;

    transmitting a second ranging signal from the object directly to the ground radar, in response to the object receiving the first ranging signal;

    transmitting a third ranging signal from the object directly to the first satellite, in response to the object receiving the first ranging signal;

    transmitting a fourth ranging signal from the first satellite directly to a satellite ground station, in response to the first satellite receiving the third ranging signal;

    transmitting a fifth ranging signal from the object directly to the second satellite, in response to the object receiving the ranging signal;

    transmitting a sixth ranging signal from the second satellite directly to the satellite ground station,, in response to the second satellite receiving the fifth ranging signal;

    determining a first time delay corresponding to a time difference between transmission of the first ranging signal and receipt of the second ranging signal;

    determining a second time delay to a time difference between transmission of the first ranging signal and receipt of the fourth ranging signal;

    determining a third time delay corresponding to a time difference between transmission of the first ranging signal and receipt of the sixth ranging signal; and

    determining the position of the object based on known locations of the ground radar, the first satellite, the second satellite, and the satellite ground station, and the first, second, and third time delays.

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