Mai Chaoyun

Bio: Mai Chaoyun is an academic researcher. The author has contributed to research in topics: Signal & Frequency modulation. The author has an hindex of 1, co-authored 1 publications receiving 5 citations.

Radar communication waveform design method based on sparse frequency

Abstract: The invention discloses a radar communication waveform design method based on sparse frequency. The method includes the steps that step1, a radar Tag system receives scattering radar echoes, and a power spectral density matching method is adopted for designing sparse frequency radar waveforms for the scattering radar echoes; step2, eigen decomposition is performed on the sequence of the sparse frequency radar waveforms to obtain an eigenvector group, and part of the eigenvector group is used for designing communication waveforms; step3, the communication waveform obtained in the step2 are embedded into the obtained sparse frequency radar waveforms, and obtained hybrid waveforms are sent to a radar receiver. Compared with linear frequency modulation waveforms, the sparse frequency waveforms can widen the occupied space of a frequency band of communication signals, and therefore a higher communication rate can be obtained; meanwhile, communication signal samples are mutually orthogonal and related with the sparse frequency waveforms to some degree, and therefore it can be guaranteed that the error rate and interception rate of the communication signals are low.

Frequency modulation scheme for fmcw radar

Abstract: A method for a radar transmitter is described herein. In accordance with one exemplary embodiment, the method includes generating an RF transmit signal composed of at least one sequence of sub-sequent chirp pulses, wherein pseudo-randomly selected chirp pulses are blanked, and radiating the RF transmit signal via at least one antenna as radar signal.

Broadband MIMO radar sparse spectrum waveform design method based on alternative iteration

Abstract: The invention belongs to the field of MIMO radar waveform design, and particularly relates to a broadband MIMO radar sparse spectrum waveform design method based on alternative iteration. The method comprises the steps of 1, using an anticipated spectrum matrix P as a to-be-optimized auxiliary variable, performing comprehensive consideration on minimizing a means square error between a transmitting waveform spectrum and an anticipated spectrum and using an integrating sidelobe level as a target function, establishing a combined optimization model in a manner that a transmitting waveform constant modulus and an anticipated spectrum amplitude satisfy an upper-limit restriction and a lower-limit restriction; 2, in an algorithm frame of alternative iteration, solving a third variable through fixing two variables in an iteration process; and 3, after algorithm convergence, terminating alternative iteration, and obtaining an MIMO radar sparse spectrum waveform. The broadband MIMO radar sparse spectrum waveform design method can effectively settle problems of working frequency band congestion and electromagnetic interference in the broadband MIMO radar. According to the method, the algorithm frame of alternative iteration is utilized; main calculation is realized through FFT; and high calculation efficiency is realized. According to the broadband MIMO radar sparse spectrum waveform design method, weight factors can be reasonably set according to an actual electromagnetic environment; and furthermore flexibility and adaptability of the waveform design method are improved.

Gravity wave parameter calculation method and device and terminal

Abstract: The invention provides a gravity wave parameter calculation method and device and a terminal, and relates to the technical field of gravity wave. The method comprises the following steps of: obtainingan original temperature profile on the basis of detection data obtained by detecting atmospheric temperature by a sounding rocket; fitting the detection data by adoption of a preset processing methodso as to obtain a background temperature profile, wherein the preset processing method comprises a moving average polynomial fitting method with a filter coefficient or a Kalman filter algorithm; solving a difference value between the original temperature profile and the background temperature profile so as to obtain a temperature disturbance profile; and calculating a gravity wave parameter on the basis of the temperature disturbance profile, wherein the gravity wave parameter comprises gravity wave spectrum power density. According to the method, the correctness of the gravity wave parameter can be effectively improved.

FFT-based (fast Fourier transform-based) planar array MIMO (multiple-input and multiple-output) radar waveform design method

Abstract: The invention belongs to the technical field of radars and discloses an FFT-based planar array MIMO radar waveform design method. The FFT-based planar array MIMO radar waveform design method comprises establishing a geometric model of an MIMO radar, evenly extracting a number of azimuth angles and pitch angles within the azimuth angle range and the pitch angle range of a two-dimensional uniform planar array, and for any azimuth angle and any azimuth, calculating a corresponding transmission steering vector; for every transmitted beam, structuring a corresponding azimuth angel range and a corresponding pitch angle range, through azimuth range and the pitch angle range, computing a covariance matrix on the X axis and a covariance matrix on the Y axis, and then through the covariance matrixes on the X axis and the Y axis, to obtain the covariance matrix corresponding to the transmitted beam; through all the covariance matrixes and all the transmission steering vectors, computing the pattern function of the MIMO radar. The FFT-based planar array MIMO radar waveform design method can achieve waveform design of the planar array MIMO radar and is low in computation burden.

Method and device for designing and optimizing multi-degree-of-freedom frequency-modulation signal

Abstract: Provided are a method and device for designing and optimizing a multi-degree-of-freedom frequency-modulation (FM) signal, and a computer storage medium. The method includes that: a time domain function of the multi-degree-of-freedom FM signal is determined; the constraint condition and the objective function of multi-degree-of-freedom FM signal optimization are established; an algorithm model of augmented Lagrangian genetic algorithm is determined based on the constraint condition and the objective function; characteristic parameters of the first iteration of the algorithm model are initialized, where the characteristic parameters of the first iteration at least include the Lagrange multiplier of the first iteration and the offset of the first iteration; initialization signal of the multi-degree-of-freedom FM signal is acquired, and initialization frequency control points of the initialization signal are determined based on the initialization signal.