Other

Chinese Academy of Sciences

Institute of Electronics, Chinese Academy of Sci.

Kaiyu Liu

Yu Wang

Wei Wang

Heng Zhang

Yongwei Zhang

Yunkai Deng

Guodong Jin

Dacheng Liu

Yafeng Chen

Yajun Long

Hangjian Li

Yu Sha

Da Liang

Haoyu Lin

A method and apparatus for generating a NLFM signal in real time, and a computer storage medium are disclosed, including: determining a signal parameter of a signal according to a system parameter, the signal parameter includes: a signal bandwidth, a signal pulse width and a PSLR; determining a power spectrum density function according to PSLR; calculating the power spectrum density function to obtain a group delay vector; calculating a frequency axial vector according to a system sampling rate; calculating a time axial vector according to the signal pulse width; performing linear interpolation calculation on the group delay vector to obtain an instantaneous frequency vector; integrating the instantaneous frequency vector to obtain a phase vector; determining a signal time domain discrete vector; and generating a digital signal according to the signal time domain discrete vector, and performing digital-to-analog conversion on the digital signal to obtain the NLFM signal.

Method and apparatus for generating non-linear frequency modulation signal in real time and computer storage medium

Provided are a method and an apparatus for range ambiguity suppression based on orthogonal nonlinear frequency modulation (NLFM) waveforms. The method includes that: according to transmitted orthogonal NLFM signals, a waveform sequence of the transmitted signals corresponding to an obtained echo signal is determined; a set of range matched filters is constructed according to the waveform sequence and the orthogonal NLFM signals; range compression is performed on the echo signal by using the set of range matched filters to obtain range-compressed data; and synthetic aperture radar (SAR) imaging is performed according to the range-compressed data, to obtain an imaging result, and the imaging result is outputted. A non-transitory computer-readable storage medium is also provided.

Method for range ambiguity suppression based on multi-degree-of-freedom frequency modulation signal

A phase synchronization method includes: pulse widths of first and second phase synchronization signals and starting time of transmission of first and second phase synchronization signals are determined, wherein starting time is located between two successive moments when radar signals are transmitted; first spaceborne SAR is controlled to transmit first phase synchronization signal to second spaceborne SAR according to pulse width and starting time of first phase synchronization signal; second spaceborne SAR is controlled, according to pulse width and starting time of second phase synchronization signal, to transmit second phase synchronization signal to first spaceborne SAR; compensation phase is determined according to peak phases of first and second phase synchronization signals received by second and first spaceborne SARs respectively; and phase synchronization compensation is performed, according to compensation phase, on radar signals received by first spaceborne SAR and second spaceborne SAR.

Method and device for non-interrupted phase synchronization scheme for bistatic synthetic aperture radar

Growing community of inventors

Beijing, China

Kaiyu Liu