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Sensors 2018, 18(10), 3386; https://doi.org/10.3390/s18103386

Multi-Target Detection Method Based on Variable Carrier Frequency Chirp Sequence

1,2,3
,
1,2,*
and
1,2,3
1
Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China
2
Institutes for Robotics and Intelligent Manufacturing, Chinese Academy of Sciences, Shenyang 110016, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Received: 1 September 2018 / Revised: 26 September 2018 / Accepted: 5 October 2018 / Published: 10 October 2018
(This article belongs to the Special Issue Perception Sensors for Road Applications)
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Abstract

Continuous waveform (CW) radar is widely used in intelligent transportation systems, vehicle assisted driving, and other fields because of its simple structure, low cost and high integration. There are several waveforms which have been developed in the last years. The chirp sequence waveform has the ability to extract the range and velocity parameters of multiple targets. However, conventional chirp sequence waveforms suffer from the Doppler ambiguity problem. This paper proposes a new waveform that follows the practical application requirements, high precision requirements, and low system complexity requirements. The new waveform consists of two chirp sequences, which are intertwined to each other. Each chirp signal has the same frequency modulation, the same bandwidth and the same chirp duration. The carrier frequencies are different and there is a frequency shift which is large enough to ensure that the Doppler frequencies for the same moving target are different. According to the sign and numerical relationship of the Doppler frequencies (possibly frequency aliasing), the Doppler frequency ambiguity problem is solved in eight cases. Theoretical analysis and simulation results verify that the new radar waveform is capable of measuring range and radial velocity simultaneously and unambiguously, with high accuracy and resolution even in multi-target situations. View Full-Text
Keywords: multi-target detection; continuous wave radar systems; variable carrier frequency chirp sequence; Doppler ambiguity multi-target detection; continuous wave radar systems; variable carrier frequency chirp sequence; Doppler ambiguity
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Wang, W.; Du, J.; Gao, J. Multi-Target Detection Method Based on Variable Carrier Frequency Chirp Sequence. Sensors 2018, 18, 3386.

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