System and method for inverse multilateration

• US 7,272,495 B2
• Filed: 04/01/2004
• Issued: 09/18/2007
• Est. Priority Date: 04/01/2004
• Status: Active Grant

• Current Assignee: Harris Corporation (L3Harris Technologies, Inc.)
• Original Assignee: ITT Manufacturing Enterprises, Inc. (ITT, Inc.)
• Inventors: Coluzzi, Michael Eugene, Rees, Bernard Andrew, Kang, Sung Phill
• Primary Examiner(s): BEAULIEU, YONEL
• Application Number:
  US10/814,650
• Publication Number:
  US 20050222757A1
• Time in Patent Office: 1,265 Days
• Field of Search: 701/200, 701/207, 701/25, 701/214, 342/450, 342/453, 342/463, 342/465, 342/357.08, 342/357.09, 340/988
• US Class Current: 701/207
• CPC Class Codes: G01S 19/11 wherein the cooperating elements are pseudolites or satellite radio beacon positioning system signal repeaters
• CPC Class Codes: G01S 19/12 wherein the cooperating elements are telecommunication base stations
• CPC Class Codes: G01S 5/10 Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements , e.g. omega or decca systemsG01S5/12 takes precedence ; beacons and receivers cooperating therewith G01S1/306, G01S1/308

Abstract

A method and system for location-determination of a mobile comprising of a receiver with a variable processor gain of up to 45.15 dB for detecting signals transmitted from transmitters that at a farther distance as well as from transmitters that are situated in sparsely populated areas. The system also includes a plurality of terrestrially deployed transmitters known as “pseudolites” that broadcast GPS-like signals, and in addition implementing the use of existing, available information from modulated signals, such as phase, amplitude and convolution with pseudorandom codes.

Claims

1. A method for locating an object utilizing inverse multilateration, the method comprising:

receiving signal pulses from a transmitting object at a mobile detection device;

calculating a slant range between the transmitting object and the mobile detection device;

calculating a position vector of the transmitting object based at least in part on the slant range, the position vector specifying the position of the transmitting object; and

calculating the location of the mobile detection device relative to the position of the transmitting object.

2. The method of claim 1 wherein the calculation of the position vector of the transmitting object further comprises computing {right arrow over (v)}₁=(A₁^TQ⁻

1A₁)<sup>−

1</sup>A₁^TQ<sup>−

1</sup>·

b₁.

3. The method of claim 1 wherein the calculation of a slant range further comprises use of time of arrival data.

4. The method of claim 3 wherein a known distribution of noise is added to the time of arrival data.

5. The method of claim 1 wherein receiving signals pulses from a transmitting object further comprises computing the repetition time between adjacent pulses.

6. The method of claim 1 wherein the signal pulses are transmitted from a fixed object and the mobile detection device is airborne.

7. A system for locating an object utilizing inverse multilateration, the system comprising:

a receiver for receiving signal pulses from a transmitting object at a mobile detection device;

a calculator for calculating a slant range between the transmitting object and the mobile detection device; and

a position vector calculator for calculating a position vector of the transmitting object based at least in part on the slant range; and

a calculator for calculating the location of the mobile detection device relative to the position of the transmitting object.