Abstract
A multiple-input multiple-output (MIMO) method that shares the same frequency band can efficiently increase radar performance. An essential element of a MIMO radar is the orthogonality of the waveform. Typically, orthogonality is obtained by spreading different signals into divided domains such as in time-domain multiplexing, frequency-domain multiplexing, and code domain multiplexing. This paper proposes a method of spreading the interference signals outside the range bins of interest for pulse doppler radars. This is achieved by changing the pulse repetition frequency under certain constraints, and an additional gain can be obtained by doppler processing. This method is very effective for improving the angular accuracy of the MIMO radar for a small number of air targets, although it may have limitations in use for many targets or in high clutter environments.
Highlights
Waveform for Improving TrackingAs the application field of radar systems has expanded, the number of radar sensors operating at the same frequency has been continuously increasing
Because the delay of the reflective signal is specified by the target position and cannot be synchronized from the receiver in radar systems, transmit waveforms should be orthogonal for all time delays, which is almost impossible
This paper proposes a method for dividing range bins using different pulse repetition frequencies (PRFs) for pulse doppler radars
Summary
As the application field of radar systems has expanded, the number of radar sensors operating at the same frequency has been continuously increasing. The proposed method uses different PRFs and intrapulse modulation codes while retaining the MIMO beamforming condition; the pulse-to-pulse coherency from different transmitters is not maintained, and cross-correlations cannot obtain interpulse integration gain. This method is useful for improving the accuracy when there are a small number of aerial targets, and has limitations that are difficult to use in cluttered environments because it spreads the power of other transmit signals to the irrelevant range bins.
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