A first-order Gaussian pulse power synthesis circuit
A technology of power synthesis circuit and Gaussian pulse, which is applied in the direction of pulse technology, pulse processing, electrical components, etc., can solve the problems of pulse synchronization debugging difficulty, reduce output pulse amplitude, and small amplitude, so as to improve stability and reduce time The effect of base jitter and trigger pulse amplitude is large
Active Publication Date: 2020-09-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[0004] Most of the radar signal sources in the well now are realized by the avalanche tube marx circuit, which uses continuous charging and instantaneous discharge to generate shock pulses. In the marx block, the number of stages of the avalanche tube is increased to increase the output amplitude, but it is affected by the characteristics of the avalanche tube. , after the number of avalanche tube series increases to a certain level, the amplitude increase will gradually slow until it approaches saturation. At the same time, too many series will bring great difficulty in debugging the pulse synchronization, and in order to ensure that the marx circuit block of the avalanche tube can work stably , generally adopts the method of undercapacitance, which greatly reduces the output pulse amplitude, especially when designing a sub-nanosecond pulse source, the output amplitude will be smaller
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[0024] like Figure 4 As shown, this is a three-port network. Input signals are added from ports 1 and 2, respectively matched by three quarter-wavelength microstrip lines, and finally the synthesized signal is output at port 3. The resistance added between the ports is to increase the isolation between the ports. The specific power superposition method is:
[0025] Define the basic Gaussian pulse shape as
[0026]
[0027] In the formula, U 0 is the pulse peak amplitude, α is the pulse time parameter, called the pulse shaping factor;
[0028] The first derivative of the basic Gaussian impulse is:
[0029]
[0030] In order for the pulse peak value to be U 0 , amended to
[0031]
[0032] In the formula is the maximum peak value of the pulse U 0 at the corresponding time;
[0033] When V 1 =V 2 =V even , that is, the input port 2 and 3 add the same phase signal, then the output signal When V 1 =-V 2 =V odd , that is, when the input port 1 and 2 add a...
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The invention discloses a first-order Gaussian pulse power synthesis circuit, which belongs to the field of electronic circuits, and is mainly used to increase the power of radar transmitters in wells and increase the radar detection distance without loss of resolution. The pulse sub-sources of two avalanche tube marx circuits are superimposed by the method of coherent synthesis, and the output high-amplitude pulse signal is matched with the transmitting antenna. In order to increase the detection distance or depth when the detection frequency is fixed, that is, the resolution is determined, the present invention has developed a first-order Gaussian pulse power synthesis circuit, which can greatly increase the pulse power, and the increase in amplitude can be improved to a certain extent. The signal-to-noise ratio of the transmitter. In this synthesis scheme, two first-order Gaussian pulses with a pulse width of 1.52ns, an amplitude of 1.1kv, and a pulse waveform that are basically the same are passed through a Wilkinson power combiner, and the output pulse amplitude is 1.53kv, and the pulse width waveform is basically unchanged. The power stacking efficiency is about 98%, and the amplitude stacking rate is 70%.
Description
technical field [0001] The invention belongs to the field of electronic circuits, and mainly aims to increase the power of radar transmitters in wells and increase the radar detection distance without loss of resolution. The pulse sub-sources of two avalanche tube marx circuits are superimposed by the method of coherent synthesis, and the output high-amplitude pulse signal is matched with the transmitting antenna. Background technique [0002] With the development of the economy, the demand for oil and gas resources in the world continues to increase, the exploration area for oil and gas resources is gradually expanding, the exploration depth is gradually deepening, the difficulty of exploration is gradually increasing, and the cost of trial and error is getting higher and higher. Therefore, oil and gas resources An accurate and efficient logging method is urgently needed in the field of exploration. The in-hole radar logging system is the product of applying radar technolo...
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IPC IPC(8): H03K5/133
CPCH03K5/133
Inventor 赵青徐文强马春光赵怿哲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA