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ALGORITHM OF COMPUTING THE AMBIGUITY FUNCTION IN THE TASK OF SIMULTANEOUS ESTIMATION
Loginov Aleksey Andreevich, Candidate of physical and mathematical sciences, senior stuff scientist, Physical-Technical Research Institute of Nizhny Novgorod State University named after N. I. Lobachevsky (23 Gagarin
Background. Among widely-known and promising methods of estimating different time-frequency parameters of signals are those based on computing and analysis of the ambiguity function (or the cross-ambiguity function). In different tasks of radio navigation and estimation of location of the radio-emitting engines such characteristics as time delay of arrival (TDOA) and frequency difference of arrival (FDOA) are extremely important. These appear when the signal spreads from the emitter to a number of spatially separated receivers. Both emitter and receivers might make arbitrary moves in the space as well. The ambiguity function in this case is used for simultaneous assessement of TDOA and FDOA. The TDOA is commonly used in the range-difference method of location of emitting sources, at the same time FDOA is used to estimate their velocities. The most serious problem in practical usage of the ambiguity function is a large amount of computations taken. The main purpose of the work is to develop an efficient method of computing the ambiguity function which would be suitable for implementing in modern graphics hardware.
ambiguity function, radar, parallel computing, mutual time delay.
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