Multi-target data processing for multi-static and multi-channel passive radars
First Claim
1. A tracking method for multi-channel radar systems, the system comprising a receiver exploiting the transmissions of a number of utility transmitters, each transmitter forming with the receiver a bistatic base, the transmission produced by each of the transmitters exhibiting a spectrum consisting of different frequency whose treatment leads to each measurement instant in the creation of blips, each blip being characterized by a vector of three measurement constituted by a bistatic distance measurement, a bistatic speed measurement and an azimuth measurement, as well as a 3 ×
- 3 diagonal matrix of the errors associated to these measurements, comprising;
a first upstream merging step;
applied separately at each bistatic base, operating directly in the space of the components of the vectors characterizing the blips, and implementing an operation to form individual tracks, carrying the identification of the blips of different frequency channels relative to the same target and the instantaneous merging of these blips, the operation to form individual tracks comprising for each measurement instant;
a first blip merging substep for associating the individual blips of the various reception channels of each bistatic base which exhibit, for a given measurement instant, measurement vectors yj that are close to one another and forming merged blips, each merged blip j being characterized by a measurement vector yj =(rb, vb, θ
) where rb, vb and θ
respectively represent the bistatic distance measurement, the bistatic speed measurement and the azimuth measurement of the detected object by the considered bistatic base;
a second substep for constructing individual tracks from the merged blips, an individual track being formed by the succession over time of the merged blips relating to one and the same target, each detected target being represented by a bistatic individual track which characteristics change over time depending on blips associated to it;
the blip merging substep using a blip aggregation module which associates the individual blips of various reception channels of one and the same bistatic base which exhibit, for a given measurement instant, measurement vectors yj that are close to one another, taking the measurements accuracy into account, and forms merged blips, the aggregation of two individual blips p1 and p2 is achieved if the measurement vectors y1 and y2 characterizing these blips satisfy the proximity criterion defined by the following three relations;
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention relates to the general field of radar tracking applied to multi-static radar systems. It consists of a method for coherently merging the individual tracks generated from the various bistatic bases that make up the system so as to generate and maintain global tracks so that an object detected by a single bistatic base is represented by the corresponding track and an object detected by a number of bistatic bases and giving rise to the creation of a number of individual tracks is represented only by a single global track.
-
Citations
14 Claims
-
1. A tracking method for multi-channel radar systems, the system comprising a receiver exploiting the transmissions of a number of utility transmitters, each transmitter forming with the receiver a bistatic base, the transmission produced by each of the transmitters exhibiting a spectrum consisting of different frequency whose treatment leads to each measurement instant in the creation of blips, each blip being characterized by a vector of three measurement constituted by a bistatic distance measurement, a bistatic speed measurement and an azimuth measurement, as well as a 3 ×
- 3 diagonal matrix of the errors associated to these measurements, comprising;
a first upstream merging step;
applied separately at each bistatic base, operating directly in the space of the components of the vectors characterizing the blips, and implementing an operation to form individual tracks, carrying the identification of the blips of different frequency channels relative to the same target and the instantaneous merging of these blips, the operation to form individual tracks comprising for each measurement instant;a first blip merging substep for associating the individual blips of the various reception channels of each bistatic base which exhibit, for a given measurement instant, measurement vectors yj that are close to one another and forming merged blips, each merged blip j being characterized by a measurement vector yj =(rb, vb, θ
) where rb, vb and θ
respectively represent the bistatic distance measurement, the bistatic speed measurement and the azimuth measurement of the detected object by the considered bistatic base;a second substep for constructing individual tracks from the merged blips, an individual track being formed by the succession over time of the merged blips relating to one and the same target, each detected target being represented by a bistatic individual track which characteristics change over time depending on blips associated to it; the blip merging substep using a blip aggregation module which associates the individual blips of various reception channels of one and the same bistatic base which exhibit, for a given measurement instant, measurement vectors yj that are close to one another, taking the measurements accuracy into account, and forms merged blips, the aggregation of two individual blips p1 and p2 is achieved if the measurement vectors y1 and y2 characterizing these blips satisfy the proximity criterion defined by the following three relations; - View Dependent Claims (2, 3, 5, 7, 9, 11, 13)
- 3 diagonal matrix of the errors associated to these measurements, comprising;
-
4. A tracking method for multi-channel radar systems, the system comprising a receiver exploiting the transmissions of a number of utility transmitters, each transmitter forming with the receiver a bistatic base, the transmission produced by each of the transmitters exhibiting a spectrum consisting of different frequency whose treatment leads to each measurement instant in the creation of blips, each blip being characterized by a vector of three measurement constituted by a bistatic distance measurement, a bistatic speed measurement and an azimuth measurement, as well as a 3 ×
- 3 diagonal matrix of the errors associated to these measurements, comprising;
a first upstream merging step, applied separately at each bistatic base, operating directly in the space of the components of the vectors characterizing the blips, and implementing an operation to form individual tracks, carrying the identification of the blips of different frequency channels relative to the same target and the instantaneous merging of these blips, the operation to form individual tracks comprising for each measurement instant; a first blip merging substep for associating the individual blips of the various reception channels of each bistatic base which exhibit, for a given measurement instant, measurement vectors yj that are close to one another and forming merged blips, each merged blip j being characterized by a measurement vector yj =(rb, vb, θ
) where rb, vb and θ
respectively represent the bistatic distance measurement, the bistatic speed measurement and the azimuth measurement of the detected object by the considered bistatic base;a second substep for constructing individual tracks from the merged blips, an individual track being formed by the succession over time of the merged blips relating to one and the same target, each detected target being represented by a bistatic individual track which characteristics change over time depending on blips associated to it; the blip merging substep using; a first blip aggregation module which associates the individual blips of various reception channels of one and the same bistatic base which exhibit, for a given measurement instant, measurement vectors yj that are close to one another, taking the measurements accuracy into account, and forms merged blips, a second module for merging the aggregated individual blips which generates, for each aggregate, a single resultant measurement vector y(rb, Vb, θ
), from measurement vectors yj(rb, Vb, θ
) of the blips forming the aggregate, y being defined by the following equalities; - View Dependent Claims (6, 8, 10, 12, 14)
- 3 diagonal matrix of the errors associated to these measurements, comprising;
Specification