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Double-channel radar echo simulator and method and system for generating double-channel radar echo signal

A technology of radar echo simulation and radar echo, which is applied in radio wave measurement system, radio wave reflection/re-radiation, instruments, etc.

Active Publication Date: 2013-01-09
NAT SPACE SCI CENT CAS
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  • Claims
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Problems solved by technology

[0005] However, the existing radar echo simulator can only generate one echo signal

Method used

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  • Double-channel radar echo simulator and method and system for generating double-channel radar echo signal
  • Double-channel radar echo simulator and method and system for generating double-channel radar echo signal
  • Double-channel radar echo simulator and method and system for generating double-channel radar echo signal

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Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with specific drawings and embodiments.

[0023] The system for generating a dual-channel radar echo signal provided by an embodiment of the present invention includes: a host computer and a dual-channel radar echo simulator.

[0024] figure 1 A schematic diagram of the system framework of the dual-channel radar echo simulator is shown. The dual-channel radar echo simulator includes: power supply (not shown), frequency synthesizer, FPGA control circuit, first DDS (first direct digital frequency synthesizer), second DDS (second direct digital frequency synthesizer) device), the first up-converter, the second up-converter and the power division network.

[0025] The power supply converts 220V AC voltage into DC voltage, which is used to provide +12V / 1A, +15V / 3A, +5V / 3A, -5V / 1A DC, and control frequency synthesizer, first DDS, second DDS, FPGA The circuit, the first up-converter and the second up-con...

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Abstract

The invention discloses a double-channel radar echo simulator as well as a method and a system for generating a double-channel radar echo signal. In the double-channel radar echo simulator, a frequency integrator is used for supplying a clock signal; a field programmable gate array (FPGA) control circuit transmits a control signal to a first digital display scope (DDS) and a second DDS; the first DDS and the second DDS respectively receive the control signal transmitted by the FPGA control circuit and respectively output a first middle-frequency signal and a second middle-frequency signal to a first upper frequency converter and a second upper frequency converter; the first upper frequency converter performs upper frequency conversion on the first middle-frequency signal to obtain a first radio frequency signal; the second upper frequency converter performs upper frequency conversion on the second middle-frequency signal to obtain a second radio frequency signal; and a power distributing network receives the first radio frequency signal and the second radio frequency signal and decomposes the first radio frequency and the second radio frequency signal. By setting two signal processing paths, different delayed interference specific absorption rate (SAR) echo signals are generated according to the variation of a distance between a radar and a measured target.

Description

technical field [0001] The invention relates to the field of radar echo simulation, in particular to a dual-channel radar echo simulator, and also relates to a method and a system for generating dual-channel radar echo signals. Background technique [0002] Radar detects targets using the reflection of electromagnetic waves off surfaces. The distance of the target is judged according to the time delay of the target echo signal, and the azimuth of the target is determined according to the beam pointing. The resolution of early radars was very low, and the resolution unit was usually larger than the size of the target, and the target could only be regarded as a point target. The advent of imaging radar expanded the original radar concept. The radar has the ability to identify and image moving targets and regional targets, and shows increasing potential in microwave remote sensing. Compared with traditional optical imaging, radar has the advantages of all-day and all-weather...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40G01S13/90
Inventor 顾翔杨启伦张云华
Owner NAT SPACE SCI CENT CAS
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