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A sar radar system and a method relating thereto

A radar system, radar technology, applied in the field of diffraction-limited SAR scenes

Inactive Publication Date: 2009-09-30
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, they are much more efficient numerically and by using LBP it is possible to obtain real-time or near-real-time processing of e.g. CARABAS data with very large aeronautical coverage

Method used

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  • A sar radar system and a method relating thereto
  • A sar radar system and a method relating thereto
  • A sar radar system and a method relating thereto

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Embodiment Construction

[0040] The present invention provides a radar system and method, respectively, in which the DL SAR processing components are implemented using the FFB algorithm in such a way that the processing does not need to assume that any special significant ground features will be present in the raw data, even though this facilitates determination of the platform path and thus motion compensate. This is very advantageous. Furthermore, the platform path is associated with a large number of parameters, implying that considerable computational convenience is required and a large set of motion-determining parameters for complex devices in the system is required to be fast enough.

[0041] First, to describe the concept of the present invention in a somewhat more general manner, it can be said that it consists of three main parts. First, suppose that P i is the set of points in space, and P i →P i+1 is a set of adjacent subapertures with a common length L that image the same ground area ...

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Abstract

The present invention relates to a radar system comprising a platform (10) movable along a path in relation to a ground surface portion (20) and carrying a positioning device, a timing device and a radar equipment (1). It is adapted to implement SAR for imaging the ground portion. It includes recording means for collecting radar raw data comprising radar echo amplitudes annotated with distance and the moment of time of collection and being intertwined with platform position measurement data annotated with the respective moment of time of collection thereof. It also comprises processing means (3,4) for SAR processing using the collected radar raw data and position measurement data, and being adapted to calculate, by iteration, a sequence of summations of length k of radar amplitudes, annotated with distance and angular parameters, defined with respect to a common origin in 3-dimensional space defined at a location along a vector formed by the vector sum PQPI + PiP2 +... + P^iPfc of k connected 3-dimensional vectors PQPJ, -PjP2V -5 Pk-I-Pk . Each vector (subaperture) contains a respective origin of each radar amplitude term in the summation, and the processing means are adapted to initiate the iteration process in a first iteration stage by regarding radar raw data as the radar amplitudes, where these radar data have their origins along vectors starting and ending in 3-dimensional points given by the positioning measurements.

Description

technical field [0001] The present invention relates to diffraction-limited SAR scenes, such as (Synthetic Aperture Radar) systems for providing images of multiple objects including, for example, parts of the ground surface. The invention also relates to methods based on diffraction limited SAR. Background technique [0002] SAR is a signal processing method that can be used to acquire images from aircraft, or more generally, some kind of platform involving ground-based radar equipment with a resolution approaching that of an optical system. In practice, resolution down to about half a radar wavelength is possible. This resolution is achieved by the radar continuously imaging the ground within a given straight segment of the length L of the platform or aircraft path. The obtained angular (also called azimuth) ground resolution, measured along the arc at distance R from the platform, will be: [0003] δθ = 2 c ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9035G01S13/9017G01S13/9019G01S13/904
Inventor H·赫尔斯滕L·尤兰德P·达默特
Owner TELEFON AB LM ERICSSON (PUBL)
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