First-order Gaussian pulse power combination circuit

Abstract

The invention discloses a first-order Gaussian pulse power combination circuit and belongs to the field of an electronic circuit. The circuit is mainly used for improving power of a radar transmitterin a well, and improving radar detection distance under the condition that resolution is not damaged. Through utilization of a coherent combination method, power superposition is carried out on pulsesub-sources of two avalanche transistor marx circuits, high amplitude pulse signals are output and are in matching connection with transmitting antennas. In order to improve the detection distance ordepth under the condition of a fixed detection frequency, namely, determined resolution, the invention develops the first-order Gaussian pulse power combination circuit. According to the circuit, thepulse power can be greatly improved, and a signal to noise ratio of the transmitter is improved to a certain degree due to improvement of amplitude. According to the combination scheme, after two waysof first-order Gaussian pulses with a pulse width of 1.52ns, amplitude of 1.1kv and a basically consistent pulse wave form pass a Wilkinson power combiner, the amplitude of the output pulses is 1.53kv, and the pulse width and the waveform are basically unchanged. Power superposition efficiency is about 98%. Amplitude superposition 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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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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