(AOA/LBI) emitter ranging method and apparatus

Details (AOA/LBI) emitter ranging method and apparatus (AOA/LBI) emitter ranging method and apparatus

1992-12-11

1994-08-30

Issing, Gregory C.

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

342458, G01S 502, G01S 302

Patent

active

053432126

ABSTRACT:
An Angle of Arrival/Long Baseline Interferometer (AOA/LBI) passive ranging apparatus and method for emitter range determination can use any convenient airframe location for the two-antenna uncalibrated LBI baseline. This baseline has a theoretically unlimited length and does not require a specific SBI/LBI baseline ratio. Only a single initial AOA is required. Range partitions are formed along the single AOA. The emitter is assumed to lie in any of N range bins and the corresponding DOA (direction of arrival) unit vectors computed. Each of these DOA unit vectors is then used to predict the LBI phase differential and the N resolved LBI phases each drive a location estimator. The location estimator (filter) with consistent output provide the emitter range. The LBI range from these filters is used for subsequent DOA generation and ambiguity resolution.

REFERENCES:
patent: 3935574 (1976-01-01), Pentheroudakis
patent: 4638320 (1987-01-01), Eggert et al.
patent: 4638321 (1987-01-01), Drogin
patent: 4734702 (1988-03-01), Kaplan
patent: 4788548 (1988-11-01), Hammerquist
patent: 5189429 (1993-02-01), Guard

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