CN112737710A - PCM-DPSK-FM safety control receiver index testing method - Google Patents
PCM-DPSK-FM safety control receiver index testing method Download PDFInfo
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Abstract
The invention relates to a PCM-DPSK-FM security control receiver index testing method, and belongs to the field of digital communication. The method comprises the following steps: s1, constructing square waves; s2, generating a Pulse Code Modulation (PCM) signal; s3, generating a data file required by subcarrier modulation; and S4, testing the indexes of the security control receiver. The invention fully utilizes the characteristic that PCM-DPSK-FM has subcarrier code rate which is integral multiple of the original code rate, and the waveform composed of subcarriers in one DPSK code element is always positive and negative alternated, and the carrier inversion can not occur in one DPSK code element, and the code element inversion can occur only between different DPSK code elements, thereby achieving the purpose that the accurate test of indexes can be realized only by using a standard instrument.
Description
Technical Field
The invention belongs to the field of digital communication, and relates to a PCM-DPSK-FM security control receiver index testing method.
Background
The traditional safety control system PCM-DPSK-FM uses a modulation structure of frequency modulation subcarrier and phase modulation processing, because a secondary modulation technology is adopted, a vector signal generator is used as a traditional safety control signal source, when an index is tested, the index is difficult to accurately test, a standard instrument is generally used for generating variable power calibration power, but because of the secondary modulation technology, the first modulation technology (phase modulation) is generally placed on a front-stage standard instrument, and the second modulation (subcarrier frequency modulation) is placed on another signal source at a rear stage. The method has the disadvantages that the signal connection between the front and the back instruments has the difference of signal synchronization and power matching, and the accuracy and the convenience of index testing are influenced. When the front stage and the rear stage are connected, analog waveforms connected with an external front stage can be used as a data source of the rear stage to realize frequency modulation of the rear stage, and IQ output can be generated through the front stage and then input into the rear stage to realize connection. However, certain differences exist in signal synchronization and power matching, so that the debugging is difficult, the use is inconvenient, and the test is inaccurate.
Disclosure of Invention
In view of the above, the present invention provides a method for testing PCM-DPSK-FM safety control receiver indexes.
In order to achieve the purpose, the invention provides the following technical scheme:
a PCM-DPSK-FM security control receiver index testing method comprises the following steps:
s1, constructing square waves;
s2, generating a Pulse Code Modulation (PCM) signal;
s3, generating a data file required by subcarrier modulation;
and S4, testing the indexes of the security control receiver.
Optionally, step S1 specifically includes: the square wave is formed by utilizing the characteristic that PCM-DPSK-FM has the subcarrier code rate which is integral multiple of the original code rate and the characteristic that subcarriers in the same code element have alternate positive and negative and are not in phase reversal.
Optionally, step S2 specifically includes: according to the integer multiple feature, the pulse code modulation PCM signal is generated by multiple from continuous '01' or '10', the number of continuous '01' or '10' is equal to the multiple value.
Optionally, step S3 specifically includes: the generated pulse code modulation PCM signal data composed of '10' or '01' is stored in a standard instrument as a data source for FM data modulation, and a data file required for subcarrier modulation is generated.
Optionally, step S4 specifically includes: and testing the indexes of the security control receiver according to the error rate of the test data and the instruction error rate.
The invention has the beneficial effects that: the invention can realize the data source required by the PCM-DPSK-FM safety control system through a standard instrument, and generate a file by first modulation according to the modulation characteristics of the PCM-DPSK-FM safety control system and place the file in the standard instrument, thereby omitting first modulation, and directly performing second modulation through the generated data source file, thereby reducing the complexity and unreliable factors of operation, simplifying and improving the reliability and stability of index test.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
fig. 1 is a flow chart of the test index of the security control receiver of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Please refer to fig. 1, a method for testing PCM-DPSK-FM safety control receiver indicators.
According to the conventional security control original binary data stream, assuming that the subcarrier frequency is 5 times of the original data, that is, inputting a security control original data value, it needs to correspond to 5 subcarriers with the same frequency and phase, each subcarrier uses a corresponding "01" or "10", assuming an original data value of '0', the corresponding subcarrier data is "01010101", the above 5 "01" represents 5 subcarriers with same frequency and phase, correspondingly, assuming an original data value of '1', the corresponding subcarrier data is "10101010", the above 5 "10" also represents 5 subcarriers with same frequency and phase, according to the rule, according to the distribution rule of the original data, the data file required for subcarrier modulation can be generated, and then stored in a standard instrument, such as vector signal generator N5182B, E44 4438C, E4433 and other models, when the FM modulation is performed, a modulation data source required to be used is used. When the corresponding multiple is changed, the number of the repetitions of one subcarrier needs to be changed from "01" or "10" corresponding to one original data source, and certainly, the original data is changed, and the data file needs to be distinguished accordingly. This file, in addition to being related to the original data, is only related to the subcarrier frequency as a multiple of the code rate of the original data. Independent of the original code rate, subcarrier frequency, modulation depth, etc. Through the file, the indexes of the traditional safety control can be accurately tested, including the error rate of test data, the error rate of instructions and the like.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (6)
1. A PCM-DPSK-FM security control receiver index test method is characterized by comprising the following steps: the method comprises the following steps:
s1, constructing square waves;
s2, generating a Pulse Code Modulation (PCM) signal;
s3, generating a data file required by subcarrier modulation;
and S4, testing the indexes of the security control receiver.
2. The PCM-DPSK-FM safety control receiver index testing method according to claim 1, characterized in that: the step S1 specifically includes: the square wave is formed by utilizing the characteristic that PCM-DPSK-FM has the subcarrier code rate which is integral multiple of the original code rate and the characteristic that subcarriers in the same code element have alternate positive and negative and are not in phase reversal.
3. The PCM-DPSK-FM safety control receiver index testing method according to claim 1, characterized in that: the step S2 specifically includes: according to the integer multiple feature, the pulse code modulation PCM signal is generated by multiple from continuous '01' or '10', the number of continuous '01' or '10' is equal to the multiple value.
4. The PCM-DPSK-FM safety control receiver index testing method according to claim 1, characterized in that: the step S3 specifically includes: the generated pulse code modulation PCM signal data composed of '10' or '01' is stored in a standard instrument as a data source for FM data modulation, and a data file required for subcarrier modulation is generated.
5. The PCM-DPSK-FM safety control receiver index testing method according to claim 1, characterized in that: the step S4 specifically includes: and generating a corresponding data file through a security control receiver, comparing the data file with the data file of claim 4, and testing the error rate and the instruction error rate index of the data.
6. The PCM-DPSK-FM safety control receiver index testing method according to claim 1, characterized in that: the standard instruments are vector signal generators with models N5182B, E4438C, E4433.
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