Signal design method of OFDM (orthogonal frequency division multiplexing) radar communication integrated airborne platform system

Abstract

The invention discloses a radar communication integrated signal design method which mainly solves the problems of an increased system size, a reduced resource utilization rate and the like due to separation of a radar system from a communication system in the traditional electronic equipment system. The method comprises the steps of: 1, setting a signal parameter of the OFDM (orthogonal frequencydivision multiplexing) radar communication integrated system, 2, calculating a sub-carrier spacing final value by using the signal parameter, 3, calculating a sub-carrier number by using the sub-carrier spacing final value, 4, determining a pilot interval by using the sub-carrier number to form a pilot interval sequence, 6, putting a communication symbol sequence in an interval of the pilot interval sequence to form a frequency domain sequence, 7, transforming the frequency domain sequence to form a time domain sequence, and 8, adding a cyclic prefix for the time domain sequence to form an OFDM time domain integrated signal. An integrated concept is applied to the radar communication system; the size of the system is reduced; the resource utilization rate is increased; and the method can be used for radar communication integrated airborne platform system.

Description

technical field [0001] The invention belongs to the technical field of signal design, in particular to a signal design method, which can be used in an OFDM radar communication integrated system. Background technique [0002] The traditional electronic equipment system only has the function of the radar system or the function of the communication system alone, and the functions that can be realized are relatively single. When it is required to realize two functions at the same time, the system will be bulky, and different resources such as frequency and time will be occupied, resulting in a decrease in resource utilization. In recent years, an electronic equipment system that combines radar technology and communication technology has emerged. The integrated radar communication system can solve the above problems well, and this type of system has received more and more attention. [0003] The integration of radar and communication refers to the electronic equipment that has b...

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Problems solved by technology

[0004] One is to use radar and communication functions in a time-sharing manner. This implementation method allocates the two functions through time, which has the disadvantage of low utilization of time resources.

[0005] The second is to divide the frequency bands and use them for radar and communication functions respectively. This implementation method is wasteful in terms of spectrum utilization.

[0007] 1. When the integrated system is under the condition of high-speed movement relative to the target, the channel environment is a fast-changing channel, and the bit error rate of communication data rises, resulting in an error between the restored reference signal and the original reference signal;

[0008] 2. The processing effect of subsequent pulse compression is poor, which cannot meet the needs of the integrated system

[0009] 3. Due to the sensitivity of the OFDM signal to speed, when the pure OFDM method is adopted, the performance of the integrated signal will drop sharply, which will affect the reconstruction of subsequent reference signals and radar signal processing

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