BPSK spread spectrum receiving system
A receiving system and spread spectrum technology, applied in the transmission system, digital transmission system, modulated carrier system, etc., can solve the problems of time instability, safety hazards, lost targets, etc.
Inactive Publication Date: 2017-01-25
DFINE TECH
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Problems solved by technology
[0004] When two or more transmitting units transmit spread-spectrum signals, and the time is not fixed, there is a problem of overlap between the signals of multiple transmitted signals arriving at the receiver. Most of the receivers for multi-signal reception on the market currently use small The signal is lost, and only the large signal is despread. This method has the problem of losing the target, which directly leads to some transmitting units not being recognized, and there is a great security risk
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[0022] The intermediate frequency output by the primary frequency conversion receiver is sampled by the A / D transfer device, and the output digital signal is processed by the FPGA chip. The FPGA chip includes a data delay unit, an amplitude AGC unit, a frequency mixing filter unit and an amplitude calculation and averaging unit. Limiting and amplifying the collected signal, the amplitude AGC unit multiplies the data output by the delay unit by the amplitude to calculate the reciprocal of the amplitude of the average unit output, and inputs the output of the second mixing and filtering unit to the BPSK correlator. The other way goes to the second amplitude calculation average unit, the BPSK correlator outputs the first amplitude, the second amplitude calculation average unit outputs the second amplitude to the comparator, the first amplitude is greater than the second amplitude, the comparator outputs 1, and the first amplitude is less than For the second amplitude, the comparat...
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The invention relates to a BPSK spread spectrum receiving system that solves the problem that the resolution of existing BPSK spread spectrum system is low. A single conversion receiver outputs medium frequency and a A / D converter performs sampling. FPGA chip performs digital signal processing for the output digital signal. The FPGA chip comprises data delay, amplitude AGC, mixing and filtering and average amplitude calculation units. The FPGA chip amplifies the signals collected to a certain degree; the amplitude AGC unit multiplies the data output by the delay unit by the reciprocal of the amplitude output by the average amplitude calculation unit. One output channel of the mixed filter input into the second mixing and filtering unit goes to BPSK correlator, and another channel goes to the second average amplitude calculation unit. Output of BPSK correlator and the second average amplitude calculation unit goes to the comparator.
Description
[0001] Technical field: [0002] The invention relates to a BPSK spread spectrum receiving system in which received signals overlap. [0003] Background technique: [0004] When two or more transmitting units transmit spread-spectrum signals, and the time is not fixed, there is a problem of overlap between the signals of multiple transmitted signals arriving at the receiver. Most of the receivers for multi-signal reception on the market currently use small The signal is lost, and only the large signal is despread. This method has the problem of losing the target, which directly leads to some transmitting units not being recognized, and there is a great security risk. [0005] Invention content: [0006] The purpose of the present invention is to provide a BPSK spread spectrum receiving system in which the overlapping resolution of two received signals is 1us, and the amplitude of the two received signals can differ by 20dB. [0007] The present invention is achieved like this...
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IPC IPC(8): H04L27/227
CPCH04L27/2278
Inventor 张敏黄亮
Owner DFINE TECH