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Pulse compression method based on offset quadrature amplitude modulation OFDM signals

A technology of offset quadrature amplitude and pulse compression, applied in the field of radar, can solve the problems of waste, high-range sidelobe spectrum resources, etc., and achieve the effect of solving the high-range sidelobe problem

Active Publication Date: 2019-07-19
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the present invention proposes a pulse compression method based on offset quadrature amplitude modulation OFDM signals, which effectively solves the problem of high-distance sidelobes in traditional matched filtering methods in practical applications and the problem of setting cyclic prefixes for OFDM signals. The problem of wasting spectrum resources

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  • Pulse compression method based on offset quadrature amplitude modulation OFDM signals
  • Pulse compression method based on offset quadrature amplitude modulation OFDM signals
  • Pulse compression method based on offset quadrature amplitude modulation OFDM signals

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Embodiment Construction

[0032] In order to describe content of the present invention conveniently, at first the following terms are explained:

[0033] Term 1: Pulse Compression

[0034] Pulse compression is the process of emitting a wide pulse and processing the echo to obtain a narrow pulse.

[0035] In order to facilitate those skilled in the art to understand the technical content of the present invention, the content of the present invention will be further explained below in conjunction with the accompanying drawings.

[0036] Such as figure 1 Shown is the scheme flowchart of the present invention, a kind of pulse compression method based on offset quadrature amplitude modulation OFDM signal of the present invention, comprises the following steps:

[0037] S1. The radar transmitter transmits OQAM-OFDM signals;

[0038] The baseband equivalent transmit signal at the transmitter of the radar system can be written as:

[0039]

[0040] Among them, K is the number of subcarriers, M is the nu...

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Abstract

The invention discloses a pulse compression method based on offset quadrature amplitude modulation (OFDM) signals, the pulse compression method is applied to the technical field of radars, and aims tosolve the problems of high side lobe of pulse compression distance based on LFM signals and spectrum resource waste caused by setting CP in pulse compression based on CP-OFDM signals in the prior art. Firstly, a radar echo model based on OQAM-OFDM signals is established, then target echo signals are demodulated, the specific process of pulse compression is derived based on an interference approximation method, and non-distance sidelobe pulse compression is achieved.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to a radar pulse compression technology. Background technique [0002] OFDM signal has attracted the attention and research of many scholars due to its advantages of strong anti-interference ability and high spectrum utilization rate, and has been successfully applied in SAR imaging, target detection and tracking and other fields. Pulse compression is the core step of target detection, and pulse compression methods based on OFDM signals have been extensively studied. Generally, OFDM signals need to set a cyclic prefix (CP) to resist inter-symbol interference caused by multipath effects, resulting in waste of spectrum resources. In addition, the OFDM signal uses a rectangular window filter, which will cause serious out-of-band leakage and cause unavoidable inter-subcarrier interference. As an alternative signal of OFDM signal, offset quadrature amplitude modulation OFDM (OQAM-OFDM) ...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04B14/04G01S13/90G01S13/66
CPCG01S13/66G01S13/90H04B14/048H04L27/2601
Inventor 张天贤时巧徐龙潇葛萌萌崔国龙孔令讲杨晓波
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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