Complementary waveform construction method and module, cognitive radar system and waveform transmitting method

A construction method and waveform technology, applied in radio wave measurement systems, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve the problems that complementary waveform construction methods cannot provide enough, and achieve flexible Doppler tolerance. Effect

Active Publication Date: 2020-09-22
HARBIN INST OF TECH AT WEIHAI
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  • Description
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  • Application Information

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Problems solved by technology

[0007] Aiming at the problem that the existing complementary waveform construction methods cannot provide sufficient and flexible Doppler tolerance, the present invention pro

Method used

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  • Complementary waveform construction method and module, cognitive radar system and waveform transmitting method
  • Complementary waveform construction method and module, cognitive radar system and waveform transmitting method
  • Complementary waveform construction method and module, cognitive radar system and waveform transmitting method

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Effect test

Embodiment 1

[0136] Embodiment 1: The cognitive radar system of this embodiment controls the diversity transmission of the waveform, and its waveform transmission method, such as Image 6 Shown, including:

[0137] The first step, the initial cognitive link:

[0138] The transmitter transmits regular (no pulse-to-pulse waveform agility) bursts. Conventional waveforms have good detection capabilities for targets that have a large speed difference with background clutter, and poor detection capabilities for static and low-speed weak targets.

[0139] The second step, wave design link:

[0140] The receiver of the radar receives the signal, the signal processing module of the radar performs target detection according to the received signal and the conventional radar waveform of the transmission, and the data processing module performs target tracking on the detected target to obtain the target speed, according to the speed information of the high-speed target in the scene , Use Doppler's robust comp...

Embodiment 2

[0144] All the links in Embodiment 1 are not all necessary, and their order is not unique, but is arranged according to needs / actual conditions. If effective tracking of each target has been established, the speed of the high-speed target can be directly provided by the tracker. The first step of embodiment 1 can be omitted, and embodiment 2 is provided, which specifically includes:

[0145] The first step is to obtain the speed of each target from the radar data processing module. The Doppler robust complementary waveform building module determines the position of the spectrum zero point according to the target speed, and determines the spectrum zero point order according to the distribution range or uncertainty of the target speed. Select the window function according to the requirements, construct a Doppler robust complementary waveform, and store it in the waveform library;

[0146] In the second step, the radar transmitter extracts the constructed Doppler robust complementary ...

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Abstract

The invention discloses a complementary waveform construction method and module, a cognitive radar system and a waveform emission method, solves the problem that an existing complementary waveform construction method cannot provide enough and flexible Doppler tolerance, and belongs to the technical field of radar emission. The waveform construction method comprises the steps of determining input parameters according to requirements, and constructing a constant vector and a constant matrix; under given high-order Doppler frequency spectrum zero constraint and energy constraint, constructing a constraint optimization problem by taking maximization of similarity between a received pulse weight and a given window function as an optimization target; solving to obtain a transmitting sequence vector and a receiving pulse weight vector, and further constructing a transmitting pulse string and a receiving reference signal to complete complementary waveform construction. According to the method,a complementary waveform construction module is obtained by using a computer, a cognitive radar system is formed by combining the radar and the waveform, and the waveform transmitting method can intelligently select to transmit a common pulse string and a Doppler-tolerant complementary waveform pulse string to realize target detection.

Description

Technical field [0001] The invention relates to a Doppler robust complementary waveform construction method for weak target detection, a construction module, a cognitive radar system and a waveform transmission method. The invention belongs to the technical field of radar target detection, radar waveform design and diversity. Background technique [0002] Low, slow, and small targets in severe clutter environments, such as small drones flying illegally in cities, pose a severe challenge to the existing active radar and air surveillance systems. "Low" means that there are a lot of signal-related interference from undulating terrain, buildings, other targets and multipath effects in the environment, that is, clutter; "slow" makes traditional moving target indication / detection (MTI / MTD), Clutter suppression techniques such as Pulse Doppler (PD) are difficult to achieve good results; "small" causes the target to have weak echoes and are easily submerged by clutter. [0003] Modern rad...

Claims

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Application Information

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IPC IPC(8): G01S13/58G01S7/292G01S7/41G01S13/66
CPCG01S13/581G01S7/292G01S13/66G01S7/418Y02T10/40Y02A90/10
Inventor 周志权吴中杰赵占锋杨申
Owner HARBIN INST OF TECH AT WEIHAI
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