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A dual-channel two-stage frequency conversion wideband receiver and its automatic gain control method

A wideband receiver, dual-channel technology, applied in electrical components, transmission systems, etc., can solve the problem of losing the original amplitude information of the received signal, and achieve the effect of high sensitivity and large dynamic range

Inactive Publication Date: 2016-10-19
CHINA ELECTRONIS TECH INSTR CO LTD
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  • Claims
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Problems solved by technology

The existing two-stage frequency conversion receiver generally adopts the scheme of limiting and amplifying in the signal receiving channel to meet the requirements of high sensitivity and large dynamic range of the receiver. The disadvantage of this scheme is that the original amplitude information of the received signal is lost. In the environment where the signal density is increasing and the signal parameters are changing, to improve the accuracy of signal recognition, the amplitude information of the signal is essential, which requires the two-stage frequency conversion receiver should work in the linear region

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  • A dual-channel two-stage frequency conversion wideband receiver and its automatic gain control method
  • A dual-channel two-stage frequency conversion wideband receiver and its automatic gain control method
  • A dual-channel two-stage frequency conversion wideband receiver and its automatic gain control method

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Embodiment Construction

[0035] combined with Figures 2 to 5 The specific embodiments of the present invention are further described:

[0036] A dual-channel two-stage frequency conversion wideband receiver, comprising a receiving channel, an analog-to-digital converter and an attenuation judgment control circuit, the receiving channel is divided into a channel A receiving channel and a channel B receiving channel, and the channel A receiving channel and the channel B receiving channel have the same structure All include a pre-signal processing section, a first-level variable frequency band, and a second-level variable frequency band. There are through channels and attenuation channels.

[0037] The output end of the first-level variable frequency band of channel A is connected with the logarithmic detector of channel A, the logarithmic detector of channel A is connected to the attenuation judgment control circuit, and the output end of channel B of the first-level variable frequency band of the rec...

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Abstract

The invention discloses a double-channel two-stage frequency conversion wideband receiver and an automatic gain control method thereof. The dual-channel two-stage frequency conversion broadband receiver includes a receiving channel, an analog-to-digital converter and an attenuation judgment control circuit. The receiving channel is divided into an A-channel receiving channel and a B-channel receiving channel. Both the A-channel receiving channel and the B-channel receiving channel have the same structure. Front signal processing section, primary frequency conversion section and secondary frequency conversion section. The dual-channel two-stage frequency conversion broadband receiver has an automatic gain control function, which can ensure that the receiver always works in the linear region, and at the same time retains the original amplitude information of the received signal. The automatic gain control method provided by the present invention can pre-judge the size of the signal to be received according to the current pulse signal amplitude, preset the working status of the first attenuator and the second attenuator according to the judgment result, and avoid repeatedly switching the working channel of the attenuator , so that the receiver has been working in the linear region.

Description

technical field [0001] The invention relates to a dual-channel two-stage frequency conversion wideband receiver and an automatic gain control method thereof. Background technique [0002] With the emergence of low probability of intercept (LPI) radars and frequency agile radars, modern radars have new features against the signal environment: a large number of radiation sources, a large distribution density, serious signal overlap, and variable signal parameters. The receiver must have the characteristics of wide processing bandwidth, high sensitivity, and large dynamic range. The existing two-stage frequency conversion receiver generally adopts the scheme of limiting amplitude amplification in the signal receiving channel to meet the requirements of high sensitivity and large dynamic range of the receiver. The disadvantage of this scheme is that the original amplitude information of the received signal is lost. In the environment of increasing signal density and variable si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/16
Inventor 郝绍杰王钊何鹏张峰
Owner CHINA ELECTRONIS TECH INSTR CO LTD
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