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Sound surface wave program control correlator

A surface acoustic wave and correlator technology, applied to electrical components, impedance networks, etc.

Active Publication Date: 2004-12-15
北京中科飞鸿科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] However, the conventional surface acoustic wave correlator can only match one kind of coded spread-spectrum signal due to its fixed code, and it can’t do anything when the code of the spread-spectrum signal changes

Method used

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  • Sound surface wave program control correlator
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Embodiment Construction

[0020] The surface acoustic wave program-controlled correlator of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] Reference attached figure 2 , a surface acoustic wave program-controlled correlator is composed of a surface acoustic wave tapped delay line, a controller, a signal synthesizer and a matcher. The input end of the surface acoustic wave tapped delay line is used to input the spread spectrum signal, and its output end is provided with multiple groups of taps with interdigitated fingers, and each group of taps is connected to the controller; the controller is used to input the local reference code, and generate corresponding encoded signals output to the taps of the surface acoustic wave tapped delay line, thereby encoding the interdigits of the taps in the surface acoustic wave tapped delay line; the signal synthesizer is connected with the controller, and the expansion ...

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Abstract

This invention discloses a sound surface-wave program control correlator including a sound surface wave tap delay line, a controller and a signal synthesizer, among which, the input of the said delay line inputs frequency spread signals, its output is designed with multiple sets of taps with interdigits and each set is connected with the controller which inputs the local reference codes and generates coherent code signals to be output to the said tap so as to code the tap interdigits. The said signal synthesizer is connected with the controller, the said frequency spread signal generates phase modulation signals on the interdigits and output to the signal synthesizer via the controller so as to generate and output code type, same to the coding coherent peak of the frequency spread signals.

Description

technical field [0001] The invention relates to a surface acoustic wave program-controlled correlator in acoustic technology. technical background [0002] The surface acoustic wave correlator is used to perform fast matched filter processing on the direct sequence spread spectrum signal. The conventional surface acoustic wave correlator is as attached figure 1 As shown, it is composed of an input transducer 1 and an output transducer on a piezoelectric substrate, wherein the interdigits at different positions of the output transducer have two different connection modes of 2 and 3, corresponding to the digital signal 1 respectively and 0. Therefore, a set of codes is formed by different connection modes of the fingers. When the coding of the spread spectrum signal is exactly the same as that of the surface acoustic wave correlator, the correlation convolution operation of the coding can be completed. [0003] However, the conventional surface acoustic wave correlator can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/64
Inventor 李继良黄歆
Owner 北京中科飞鸿科技股份有限公司
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