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A communication radar joint processing method

A joint processing and radar technology, applied to radio wave measurement systems, instruments, etc., can solve the problems of poor robustness of CLEAN algorithm, missing and wrong detection of CFAR detectors, etc., to improve accuracy, improve multi-target detection rate, The effect of strong application value

Active Publication Date: 2021-11-05
SOUTHWEST JIAOTONG UNIV
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  • Application Information

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Problems solved by technology

[0010] In order to solve the technical problems of the existing JCR system based on the full-duplex assumption, such as the missing and wrong detection of the CFAR detector and the poor robustness of the CLEAN algorithm due to the high pulse pressure sidelobe value when the above target detection scheme is adopted, The invention provides a communication radar joint processing method

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  • A communication radar joint processing method
  • A communication radar joint processing method
  • A communication radar joint processing method

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Experimental program
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Effect test

Embodiment 1

[0078] The application object of Embodiment 1 of the present invention is the JCR system based on the IEEE802.11ad protocol, and the transmitted bi-phase coded radar signal uses the preamble in the IEEE 802.11ad SC PHY frame as a binary code sequence.

[0079] The IEEE 802.11ad SC PHY preamble contains two parts, STF and CEF (such as image 3 shown), where the STF consists of 16 sets of repeated Golay unilateral sequences namely Ga128 and the suffix -Ga128, and the CEF field consists of two sets of Golay complementary sequence pairs namely Gu512, Gv512 and the suffix -Gb128.

[0080] Each set of Golay complementary sequence pairs consists of Ga and Gb. Since the amplitude and phase of the autocorrelation of the complementary sequence are completely opposite at the non-zero shift, the sidelobe level will be completely canceled and the peak value will be doubled when the autocorrelation process is performed on the overall sequence pair, so the autocorrelation function of the com...

example 1

[0099] Example 1 simulation analysis:

[0100] according to Figure 5 , 6 It can be seen from the comparison results that compared with the output result of the matched pulse pressure filter using the original transmission sequence, by replacing the STF in the filter coefficient with an m-sequence of equal length, the main-side lobe ratio of the pulse pressure can be increased by 10dB. From Figure 7-Figure 11 It can be seen that after the original pulse pressure output has been processed by five rounds of algorithms, the five targets (with different RCS) set at different distances of [420, 425, 435, 520, 550] m are correctly detected one by one out, and the ideal echo signals corresponding to each target in each iteration are also directly cleared in the original echo. On the other hand, the multi-target detection method of the present invention combines and improves the two-dimensional FGOS-CACFA algorithm, which greatly improves the detection efficiency and accuracy of a...

Embodiment 2

[0102]Embodiment 1 of the present invention is aimed at the JCR system based on IEEE802.11ad, but it can also be applied to other JCR systems based on IEEE802.11 series communication protocols. For example, when the JCR system based on the IEEE 802.11ax protocol adopts this solution, the mismatch filter design can be performed for the Legacy preamble and the HE preamble in the HE-PPDU field, and the L-STF field corresponds to the matched filter coefficient. Replaced by m-sequences of equal length. On the other hand, considering that the HE-STF and HE-LTF fields are newly added training fields of the protocol, it is also necessary to select the pseudo-random sequence according to the actual autocorrelation performance of each partial sequence. Similarly, the system also adopts a target detection scheme based on the CLEAN algorithm at the receiving end, that is, the two-dimensional FGOS-CACFAR algorithm proposed by the present invention is used to detect the echo signal, and the...

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Abstract

The invention discloses a communication radar joint processing method, which comprises the following steps: firstly, the transmitting end makes the data field part of the communication frame empty, and uses the preamble code as the phase coding sequence to design the pulse radar signal. The receiving end segments the echo signal in the distance dimension, and designs the pulse pressure filter coefficient corresponding to each segment of echo data according to the characteristics of the transmitted signal coding sequence, and suppresses the pulse pressure side lobe by segmenting the pulse pressure; then The CLEAN algorithm is improved, and combined with the proposed two-dimensional FGOS-CA CFAR algorithm, the targets can be extracted and detected one by one from the pulse pressure echo. The invention effectively solves the pulse pressure sidelobe problem caused by the poor aperiodic autocorrelation performance of the transmission sequence, improves the robustness of the system, and at the same time, the calculation complexity of the scheme is not significantly increased compared with the traditional radar signal processing algorithm , and can be used for a variety of preamble sequences, and has universal applicability.

Description

technical field [0001] The invention belongs to the technical field of communication radar integration, and in particular relates to a communication radar joint processing method. Background technique [0002] The Joint Communication-Radar (Joint Communication-Radar) system realizes the integration of radar and communication functions through hardware multiplexing and waveform sharing. Traditional radar signal processing technology is used for target detection and parameter estimation. [0003] At present, the JCR system is mainly used in commercial WLAN frequency bands. Different from traditional narrowband radar signals, the JCR system based on the IEEE.802.11 protocol framework has a high data transmission rate and Advantages such as high distance resolution. Literature [P. Kumari, J. Choi, N. González-Prelcic and R. W. Heath, "IEEE 802.11ad-Based Radar: An Approach to Joint Vehicular Communication-Radar System," in IEEE Transactions on Vehicular Technology, vol. 67, no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
CPCG01S7/411
Inventor 吴浩鞠宏浩方旭明龙彦何蓉
Owner SOUTHWEST JIAOTONG UNIV