Decoding method of security command of safety command receiver

A security command and receiver technology, applied in the field of aerospace external testing, can solve problems such as shooting ranges, aircraft and personnel fatal injuries, and achieve the effect of ensuring digital confidentiality and avoiding misjudgment

Active Publication Date: 2016-02-24
10TH RES INST OF CETC
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

If a highly reliable decoding algorithm is not used in the decoding process of the safety command receiver, it will even cause fatal damage to the shooting range, aircraft and personnel

Method used

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  • Decoding method of security command of safety command receiver
  • Decoding method of security command of safety command receiver

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Experimental program
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Embodiment Construction

[0013] refer to figure 1 . In the following embodiments, the decoding method of "6 judgments and 4" security control instructions is realized by a digital circuit designed in a programmable gate array chip FPGA. In the digital circuit in the programmable gate array chip FPGA, according to the definition of the security control instruction frame format, two time windows of different lengths and a "6 judgment 4" counter are matched, and an N-bit shift register and a digital comparator are set. The two time windows are respectively cross-linked with the "6 judgment 4" counter, and a decoder is formed by connecting the N-bit shift register, digital comparator, two time windows and the common terminal of the "6 judgment 4" counter in series; In the coding process, the FPGA program first determines the total time of the two-level time window and the N value of the N-bit shift register according to the defined security control instruction frame format, where N is a natural number. ...

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Abstract

The invention provides a decoding method for safety control commands of a safety command receiver. By utilizing the method, the probability of false commands and missing commands in safety control commands can be effectively reduced, and highly reliable receiving of safety control commands can be achieved. The decoding method is realized through the following technical scheme. In the Field Programmable Gata Array (FPGA), two time windows of different lengths and a 'judging four out of six' counter are matched according to the defined frame format of safety control commands, and the total time for the two time windows and the n value of an n-bit shifting register are determined according to the safety control command frame format defined by the system. A decoder reads preset command codes, and sends demodulated numerical codes and bit synchronization pulses to the n-bit shifting register. After being changed to n-bit parallel data, the numerical codes are compared with the preset command codes, and when two command codes are the same, one decoded pulse is output. When the 'judging four out of six' counter' counts to '1' in accumulation counting, a short time window (2) is started simultaneously. When the 'judging four out of six' counter' counts to '4' in accumulation counting, one decoded pulse is output, and decoding of 'judging four out of six' safety control commands is achieved.

Description

technical field [0001] The invention belongs to the field of aerospace external testing, and relates to a processing method for performing security control decoding on security control commands demodulated by a security command receiver. Background technique [0002] The currently used safety command receiver was developed in the 1990s, and there are many problems, such as reliability. According to the characteristics of the safety command receiver, FPGA is used to complete functions such as subcarrier demodulation and command decoding. The safety command receiver receives The demodulation and command decoding are completed after the security control signal, and false commands cannot be mistakenly exploded. The traditional safety command receiver test system includes multiple special equipment and general-purpose instruments, not only the connection is complicated, the operation is cumbersome, it takes up a lot of space, the test time is relatively long, and it is more prone...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
Inventor 陈霞邓宏伟李召飞
Owner 10TH RES INST OF CETC
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