Signal processing system architecture applied to airborne laser radar
An airborne lidar and signal processing technology, used in radio wave measurement systems, measurement devices, instruments, etc.
Inactive Publication Date: 2017-03-15
TIANJIN UNIV
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Problems solved by technology
[0009] Solve the problem of large dynamic range weak light signal extraction of airborne lidar in offshore detection
A high-speed signal processing system architecture applied in airborne lidar is proposed to effectively solve the problem of extracting weak light signals with a large dynamic range
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[0026] In the present invention, in order to obtain the waveform accurately, the airborne laser radar selects a laser with a narrower pulse width, so a photomultiplier tube (PMT) with extremely high sensitivity, extremely low noise and extremely fast response speed is selected as the detection device for 532nm laser detection. The device can meet the system requirements. The PMT detector has a dynamic range of 10 3 ~10 4 , for the laser echo signal 10 6 ~10 7 Considering the design cost comprehensively, two PMT detectors are selected to splice and measure the echo signals by coordinating with the optical attenuation sheet. That is, shallow sea PMT detectors are responsible for 1-10 4 The detection work of the dynamic range, that is, the deep-sea PMT detector is responsible for 10 3 ~10 7 Dynamic range detection works.
[0027] For full waveform analysis, a high-speed analog-to-digital converter (ADC) is selected to sample the waveform. The speed of the laser in water i...
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The present invention discloses a signal processing system architecture applied to an airborne laser radar. The signal processing system architecture includes FPGAs (field programmable gate array), PMT (photomultiplier) detectors and trans-impedance amplifiers; each PMT detector converts detected laser echo signals into current signals; photocurrent is converted into analog voltage signals through the corresponding trans-impedance amplifier; the analog voltage signals outputted by the corresponding trans-impedance amplifier are divided into an A path of analog voltage signals, a B path of analog voltage signals and a C path of analog voltage signals; a high-gain amplifier, a middle-gain amplifier and a low-gain amplifier amplify the A path of analog voltage signals, the B path of analog voltage signals and the C path of analog voltage signals respectively; the amplified analog voltage signals are converted into digital signal through ADCs (analog to digital converters), namely, submarine ADCs output signals; and the corresponding FPGA receives the output signals from the submarine ADCs, sea surface data of a sea and land line scanning altitude measurement system and electrical local oscillation signals so as to realize control of a corresponding gate control circuit and the measurement of seabed distances. According to the PMT detector and multi-path ADC parallel processing-combined signal processing architecture, partial amplification and graphic splicing of signal waveforms are realized according to the needs of echo peak signal processing, and system precision can be improved.
Description
technical field [0001] In the airborne laser radar, the signal processing system architecture proposed by the present invention can effectively solve the problem of extracting weak light signals with a large dynamic range in the offshore detection process. Background technique [0002] Airborne laser sounding technology is an advanced sounding method that integrates cutting-edge technologies such as laser, global positioning and navigation, automatic control, aviation, and computers. It uses an aircraft as a platform to launch lasers from the air to detect water depth by scanning measurement. This technology is one of the most promising methods for rapid and efficient bathymetry in shallow seas, islands, reefs, and waters where ships cannot reach safely. It has high precision, wide coverage, high density of measuring points, short measurement period, low consumption, and easy management. , high mobility and other characteristics. Airborne lidar has the characteristics of hi...
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Login to View More IPC IPC(8): G01S7/48G01C7/00
CPCG01S7/4802G01C7/00
Inventor 赵毅强刘沈丰薛文佳周国清束庆冉夏显召
Owner TIANJIN UNIV