公开(公告)号：US10788587B2

公开(公告)日：2020-09-29

申请号：US16648314

申请日：2018-09-19

Applicant: SAAB AB

Inventor： Patrik Dammert ,  Hans Hellsten

IPC: G01S19/22 ,  G01S19/30 ,  G01S13/90 ,  G01S19/25 ,  G01S19/37

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.

公开(公告)号：US10746862B2

公开(公告)日：2020-08-18

申请号：US16483069

申请日：2018-02-05

Applicant: SAAB AB

Inventor： Patrik Dammert ,  Hans Hellsten

IPC: G01S13/32 ,  G01S7/02 ,  G01S13/931 ,  G01S7/35

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.