초록 ▼

System for determining the position of radar transmitters where the system includes at least one information center with associated cells and means of communication between the information center and the cells with a restricted transfer rate utilising existing infrastructure in the country, such as

System for determining the position of radar transmitters where the system includes at least one information center with associated cells and means of communication between the information center and the cells with a restricted transfer rate utilising existing infrastructure in the country, such as for example a national telephone network and also mobile telephone networks and their base stations. Each cell includes at least one sensor in order to be able to detect radar signals. Leading edges of pulses in the radar signals are detected and time-marked after which they are sorted according to PRI (Pulse Repetition Interval). The time of arrival for the first pulse in a pulse train is calculated and data reduced by modulo calculation to a value that as a maximum is the propagation time difference for pulses between two cells in a pair of cells/sensors that are used together for calculating the bearing. Bearings calculated from at least two pairs of cells are correlated in the information center which thereafter calculates the position of the radar transmitter.

대표청구항 ▼

[ What is claimed is:] [1.] A method for the data reduction of times of arrival of radar signals' pulse trains detected by cells where the cells are included in a system for position determination as sub units to an information centre and where the pulse trains consist of a number of pulses, wherein

[ What is claimed is:] [1.] A method for the data reduction of times of arrival of radar signals' pulse trains detected by cells where the cells are included in a system for position determination as sub units to an information centre and where the pulse trains consist of a number of pulses, wherein the method comprises the following steps:generating and marking a time window with a finite time extent;calculating times of arrival for pulses in the time window relative to a start of the time window thereby deriving pulse arrival times;calculating and associating with each pulse in the time window a pulse repetition interval estimate;sorting pulses and their pulse arrival times into groups according to their respective pulse repetition interval estimates;calculating a pulse repetition interval value per group based on the pulses sorted into groups,;in each group successively reducing the pulse arrival times of the pulses in the group by the pulse repetition interval value corresponding to the group until all the pulse arrival times have a value between zero and the pulse repetition interval value corresponding to the group and thereby deriving data-reduced pulse arrival times;in each group taking the average value of the data-reduced pulse arrival times per group and thereby deriving a calculated arrival time position per group;successively reducing the calculated arrival time positions by a reducing value that exceeds the propagation time of the pulses between two cells in a pair of cells until the calculated arrival time position assumes a value that is greater than zero and less than the reducing value and thereby deriving a reduced arrival time position per group.