Multi-symbol quasi-orthogonal OCDM radar communication integrated signal modulation method

Abstract

The invention discloses a multi-symbol quasi-orthogonal OCDM radar communication integrated signal modulation method, which comprises the steps of determining parameters according to application requirements, and obtaining a symbol expression of an OCDM integrated baseband signal; changing the frequency modulation slope in the symbol of the OCDM integrated baseband signal to obtain an orthogonal OCDM symbol expression which is in a quasi-orthogonal relationship with the symbol of the OCDM integrated baseband signal; and performing time-sharing selection on the symbols of the OCDM integrated baseband signal and the orthogonal OCDM to obtain a frame of OCDM baseband signal expression containing M symbols, and determining a radar communication integrated signal. According to the method, the coding sequence modulated by each OCDM symbol has excellent aperiodic self-correlation and cross-correlation characteristics, and the problem that the influence of a radar communication integrated fuzzy function on communication modulation information is sensitive is solved.

Description

technical field [0001] The invention belongs to radar communication technology, in particular to a multi-symbol quasi-orthogonal OCDM radar communication integrated signal modulation method. Background technique [0002] With the rapid development of information technology, radar and communication, as important applications of electronic information technology, develop far faster than imagined. From electronic countermeasures to civilian communication technology, the application of related technologies is very common, and the changes it brings to people's lives are also obvious. However, with the development of technology, higher requirements are put forward for the integration and function diversification of the system. The collection of electronic equipment with functions such as detection, communication and electronic countermeasures on one platform has redundant resources, large system size, and mutual electromagnetic interference. The proposal of radar communication in...

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Problems solved by technology

Later, scholars studied the applicability of the OCDM scheme for joint communication and radar, the document "De Oliveira L G, Alabd M B, Nuss B, et al.An OCDM Radar-Communication System[C].202014th European Conference on Antennas and Propagation (EuCAP),Denmark :IEEE,2020:1-5."Introduced the software radio implementation of the system and compared it with the peer-to-peer OFDM system. The resolution effect is still limited, and further research is needed to improve the resolution

[0005] In the above literature, the quadrature chirp multiplexing signal used contains one OCDM symbol in one pulse, and in this waveform design, the uncertainty of communication modulation and the variability over time are not considered for the integration of radar communication signals. The influence of the ambiguity function will lead to the deterioration of the integrated signal ambiguity map, and the detection performance of the radar will be affected

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