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1. (US20110248882) METHOD FOR INTERFEROMETRIC RADAR MEASUREMENTS

Office : United States of America
Application Number: 13140170 Application Date: 31.12.2009
Publication Number: 20110248882 Publication Date: 13.10.2011
Publication Kind : A1
Prior PCT appl.: Application Number:PCTEP0909344 ; Publication Number: Click to see the data
IPC:
G01S 13/32
G01S 13/34
G PHYSICS
01
MEASURING; TESTING
S
RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
13
Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
02
Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
06
Systems determining position data of a target
08
Systems for measuring distance only
32
using transmission of continuous unmodulated waves, amplitude-, frequency- or phase-modulated waves
G PHYSICS
01
MEASURING; TESTING
S
RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
13
Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
02
Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
06
Systems determining position data of a target
08
Systems for measuring distance only
32
using transmission of continuous unmodulated waves, amplitude-, frequency- or phase-modulated waves
34
using transmission of frequency-modulated waves and the received signal, or a signal derived therefrom, being heterodyned with a locally-generated signal related to the contemporaneous transmitted signal to give a beat-frequency signal
Applicants: IDS INGEGNERIA DEI SISTEMI S.P.A.
Inventors: Coppi Francesco
Bertoneri Alessandro
Di Pasquale Gaetano
Priority Data: PI2008A000139 31.12.2008 IT
Title: (EN) METHOD FOR INTERFEROMETRIC RADAR MEASUREMENTS
Abstract: front page image
(EN)

A method for interferometric radar measurements that provides prearranging, at a target observed by the radar, of a transponder that is adapted to perform a frequency shift fd of a radar signal received by the target, and to retransmit a response signal towards the radar. The frequency-shift is such that the signal (21), as received by the radar, can be separated from clutter (19) coming from the radar scenario, by a demodulation step (A), in particular a coherent demodulation step, and a phase extraction step (B), which may comprise a further demodulation step by a phasor that has a frequency equal to fd. If these steps are carried out subsequently, it is possible to calculate the phase difference with respect to signals 22 and then measuring the displacement that target (2) carries out between such instants. In case of a plurality of targets in a same radar scenario, the use of a corresponding plurality of transponders with specific frequency-shifts allows separately demodulating the signals coming from each transponder. In case of variable frequency radar signals, in particular if the frequency is increased according to a predetermined pitch, i.e. a frequency step, the phase extracting step may provide sampling sequences of values of the response signal coming from respective resolution cells of the radar scenario, and applying the inverse discrete Fourier transform to such sequences, in order to display the target in a resolution cell that is located between a maximum distance available by the radar and the limit of range unambiguous. The method allows overcoming well-known prior art interferometric radar systems drawbacks, since it eliminates clutter, and allows resolving more target in a same radar scenario, or in a same resolution cell.


Also published as:
EP2382487AU2009335225WO/2010/076037