Jagged Doppler frequency shift selection method for DDMA waveform

Abstract

The invention belongs to the technical field of radar, and discloses a jagged Doppler frequency shift selection method for DDMA waveform. The method comprises the following steps: determining the number of discrete points in a non-fuzzy Doppler scope and the Doppler frequency shift resolution; calculating the number of clutter Doppler points and the number of times of search, and constructing a Doppler frequency shift matrix; for each element of the Doppler frequency shift matrix, taking the coordinate thereof as the Doppler frequency shift number of a corresponding transmission channel, constructing a corresponding Doppler spectral vector after determining that the transmission channel is in the non-fuzzy Doppler scope, getting a synthetic Doppler spectral vector, and setting the element as the length of a non-overlapping clutter range in the synthetic Doppler spectral vector; and searching the maximum element in the Doppler frequency shift matrix, and calculating the optimal Doppler frequency shift corresponding to each transmission channel according to the coordinate of the maximum element. Through the method, the requirement on high-pulse repetition frequency of DDMA waveform is reduced, and the blind speed problem of a target during application of DDMA waveform is relieved effectively.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to a method for selecting a staggered Doppler frequency offset of a DDMA waveform. Background technique [0002] Multiple-Input Multiple-Output (MIMO) radar is a brand-new radar system, which has many advantages over traditional phased array radar: it is easier to detect weak and small targets, less likely to be intercepted, and higher speed The resolution has lower requirements for the front-end of the system on frequency stability, phase noise and other indicators. Due to its unique performance advantages, MIMO radar has attracted widespread attention. [0003] High-performance signal design is the key to the realization of MIMO radar. MIMO radar uses multiple antennas to transmit a group of signals at the same time, and there is unavoidable mutual ambiguity among the signal components in the echo signal. In order to effectively separate the echoes of different transmitted signal...

AI Technical Summary

Problems solved by technology

[0005] In the case of a large number of transmitting array elements or a large Doppler bandwidth, in order to avoid ambiguity in the received signal, the use of DDMA waveforms requires the radar system to use a high pulse repetition frequency. However, an excessively high pulse repetition frequency is in some radar application scenarios is difficult to achieve

In the case that the pulse repetition frequency cannot be too high, the frequency offset of the DDMA waveform can only be reduced, but this will cause Doppler ambiguity of the high-speed target, resulting in blind speed

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