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公开(公告)号：US20200225360A1
公开(公告)日：2020-07-16
申请号：US16648314
申请日：2018-09-19
Applicant: SAAB AB
Inventor： Patrik DAMMERT , Hans HELLSTEN
Abstract: The present invention relates to a method for determining a synthetic aperture of a synthetic aperture radar, SAR, system using information from a global navigation satellite system, GNSS, which includes a plurality of satellites each transmitting a radio frequency signal comprising a unique pseudo random number, PRN. The method comprises: receiving the radio frequency signal from a group of satellites in the GNSS, determining a first maximum correlation peak of the PRN of the received radio frequency signal from each satellite in the group of satellites, determining the phase shift between the first determined maximum correlation peak and a second determined maximum correlation peak of a received PRN from the same satellite at a later time, for each satellite in the group of satellites, determining a line-of-sight, LOS, movement of the SAR system relative each of the satellites in the group of satellites by means of the determined phase shift for each satellite in the group of satellites, and determining a synthetic aperture using the LOS movement relative each satellite in the group of satellites.
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公开(公告)号：US20190391246A1
公开(公告)日：2019-12-26
申请号：US16483069
申请日：2018-02-05
Applicant: SAAB AB
Inventor： Patrik DAMMERT , Hans HELLSTEN
Abstract: The present invention relates to a method for a continuous arbitrary waveform radar configured for transmitting and receiving signals over a selected communication band. The method comprises: generating the radar transmit signal with a waveform having a non-monotonic frequency change, modifying the waveform to obtain at least one spectral notch and isolating reception and transmission by cancellation. Each spectral notch at a selectable frequency with a selectable bandwidth, and the waveform is modified to maintain the spectral density of the transmit radar signal.
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公开(公告)号：US20180267163A1
公开(公告)日：2018-09-20
申请号：US15761955
申请日：2015-09-21
Applicant: SAAB AB
Inventor： Hans HELLSTEN
CPC classification number: G01S13/90 , G01S7/414 , G06K9/0063 , G06K9/6278 , G06K2209/21
Abstract: A method and a device for detecting at least one target in an image, wherein the image comprises a set of pixels with a magnitude assigned to each pixel is provided. The method comprises an iterative process until the K+1th target does not show a probability increase above a predetermined threshold value. The method is performed by creating a candidate free image, calculating, for the candidate free image, the probability of there being a target at each pixel, by using Bayes theorem, determining a location of the candidate target K+1 in the image, determining the probability that there is a target at the determined location, by determining the calculated probability of there being a target at the determined location. By performing the above, the most probable locations for targets in the image are located together with the probability that the location holds a true target.
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