Mr. Bo Song Profile

Bo Song

at Beijing Institute of Space Mechanics & Electricity

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Proceedings Article | 21 March 2023 Paper

The digital design and implementation of space-borne laser power supply

Bo Song

Proceedings Volume 12595, 1259522 (2023) https://doi.org/10.1117/12.2668951

KEYWORDS: Control systems, Transmitters, Q switches, Q switched lasers, Field programmable gate arrays

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The traditional laser power supply is built and become of analog circuit, and the precision requirements of circuit design and automatic control are difficult to meet the aerospace level. Therefore, it becomes particularly important to realize the all-digital design of spaceborne laser power supply. On the basis of FPGA technology, we design a kind of Ethernet protocol, 422 level transmission form to realize the communication with the management controller, and provide laser timing signal, Q-switched signal, AD/DA control signal for the laser. In this way, the transmitter timing and parameter adjustment functions such as charging current, charging high voltage, LD discharge current, LD drive timing sequence, Q-switching drive high voltage and Q-switching drive timing sequence which required by the laser can be realized. In addition, when the charging high voltage, charging current and LD discharge current exceed the threshold, the transmitter can be turned off automatically to realize the automatic protection function. The test results show that the design of all digital spaceborne laser power supply meets the functional requirements.

Proceedings Article | 19 September 2013 Paper

The research of precision timing measurement in application of TDC_GP2 in laser ranging

Bo Song, Wei Zheng

Proceedings Volume 8905, 890523 (2013) https://doi.org/10.1117/12.2034752

KEYWORDS: Time metrology, Precision measurement, Oscillators, Ranging, Laser range finders, Field programmable gate arrays, Distance measurement, Temperature metrology, Clocks, Signal processing

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Laser ranging could measure the distance between laser range finder and detection target by calculate the flight time of laser. The laser of laser range finder adopt semiconductor pump laser of 1064nm, PerkinElmer C30659 APD was used in photoelectric detection circuit, STC89C52 MCU and the FPGA of XC3S400 were used as the core of control system. High precision time interval measurement is one of the most important techniques in laser ranging. In this paper, we adopt a high precision time interval measurement time to digital converter chip of ACAM corporation in Germany. TDC_GP2 is the next generation of Acam general-purpose TDCs, higher resolution and smaller package size make it ideal for cost sensitive industrial applications. We select the measurement range 2 of the TDC_GP2, and the maximum time resolution is 65ps. Digital TDCs use internal propagation delays of signals through gates to measure time intervals with very high precision. Through researching the working principle of TDC_GP2, hardware circuit diagram of TDC_GP2、measurement time diagram of TDC_GP2、the system software design of TDC_GP2, and applying in the different measuring distances and different time measurement temperatures, research shows that the precision of time measurement lies on the different measuring distances and different time measurement temperatures. In the end, we make some suggestions of improving the precision of time measurement.

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