CN109782076B - Intermediate frequency signal frequency testing method for microwave communication equipment - Google Patents
Intermediate frequency signal frequency testing method for microwave communication equipment Download PDFInfo
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- CN109782076B CN109782076B CN201811624913.5A CN201811624913A CN109782076B CN 109782076 B CN109782076 B CN 109782076B CN 201811624913 A CN201811624913 A CN 201811624913A CN 109782076 B CN109782076 B CN 109782076B
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Abstract
The invention discloses a method for testing the frequency of an intermediate frequency signal of microwave communication equipment. The method has the advantages that the frequency of the interfered intermediate frequency signal is measured by adopting the voltage regulation comparator, the problem of measuring the frequency of the interfered intermediate frequency signal is solved, the intermediate frequency signal has the characteristic that the frequency changes along with the amplitude, the frequency acquisition error is reduced, the requirement on intermediate frequency signal acquisition equipment is lowered, the method has the characteristics of accurate measurement, simple test framework and the like, and the method is easy to realize.
Description
Technical Field
The invention relates to a method for testing the frequency of an intermediate frequency signal of microwave communication equipment, in particular to a frequency point adjusting device of the microwave communication equipment.
Background
As shown in fig. 1, in the frequency point adjusting process of the microwave communication equipment, the adjusting device sends a reference frequency signal to the microwave communication equipment, and the microwave communication equipment mixes the reference frequency with its own fundamental frequency signal to obtain an intermediate frequency signal. It is generally determined whether the fundamental frequency of the microwave communication equipment is the same as the reference frequency emitted by the regulating device, according to whether the frequency of the intermediate frequency signal is a certain value.
Currently, the intermediate frequency signal measuring methods include a single-step comparison counting measuring method, a high-speed analog acquisition and analysis method and the like, wherein the single-step comparison counting measuring method aims at a neat intermediate frequency signal, has a large frequency measuring error for the intermediate frequency signal with interference and unevenness, and the high-speed analog acquisition and analysis method requires a high-speed acquisition and data calculation hardware platform, so that the cost is high.
Disclosure of Invention
In view of the above, the present invention provides a method for testing the frequency of an intermediate frequency signal used in microwave communication equipment, which reduces the frequency acquisition error, reduces the requirements on the intermediate frequency signal acquisition equipment, has the characteristics of accurate measurement, simple test architecture, and the like, and is easy to implement.
A frequency test method of intermediate frequency signal used for microwave communication equipment, the regulating equipment launches the reference signal to the microwave communication equipment, the microwave communication equipment outputs the intermediate frequency signal after mixing the received reference signal with the microwave basic frequency signal of the regulating equipment, a voltage comparator is arranged in the regulating equipment, the voltage comparator is used for comparing the intermediate frequency signal output by the microwave communication equipment with the preset comparison reference signal, and the comparison result and the frequency value of the comparison result are obtained; the adjusting device adjusts a basic frequency of the microwave communication equipment or a comparison reference signal of the voltage comparator according to a difference value between the frequency value of the comparison result and the frequency value of the expected intermediate frequency signal, and finally the microwave communication equipment stably outputs the intermediate frequency signal with the frequency value equal to the reference signal frequency value transmitted by the adjusting device.
Preferably, a threshold value is set, and if the difference value is greater than the set threshold value, the basic frequency of the microwave communication equipment is adjusted; and if the difference is less than or equal to the set threshold, adjusting the comparison reference signal of the voltage comparator.
Preferably, the specific implementation manner is as follows:
step one, sending a set microwave reference frequency signal to microwave communication equipment by adjusting equipment, mixing the received microwave reference frequency signal with the microwave basic frequency of the microwave communication equipment, outputting an intermediate frequency signal, and sending the intermediate frequency signal to the adjusting equipment;
step two, the voltage comparator compares the intermediate frequency signal sent by the microwave communication equipment with the set comparison reference signal to obtain a comparison result and a frequency value F of the comparison result0；
Step three, adjusting the frequency value F of the obtained comparison result by the equipment0And the desired intermediate frequency signal frequency value f0Making a comparison if | F0-f0If the value is greater than delta f, the adjusting equipment sends a frequency adjusting instruction to the microwave communication equipment to control the microwave basic frequency of the microwave communication equipment to increase by one stepping unit; then returning to the first step; if | F0-f0If the | is less than or equal to the delta f, executing the step four; wherein, Δ f is a set threshold value, and the value is obtained according to experimental summary;
step four, equivalently reducing the comparison reference signal of the voltage comparator, then returning to the step one until the comparison reference signal is reduced to 0, and stopping; recording each comparison reference signal as A0，A1，...，AnAnd A is0＞A1＞...＞An(ii) a Recording the intermediate frequency value F corresponding to the comparison result obtained by the voltage comparator under each comparison reference signal0，F1，...，Fn(ii) a If in the process A is presenti-AjIs > Δ A, and AiTo AjIf the intermediate frequency values corresponding to the comparison results obtained by the comparator under each comparison reference signal are equal, executing the step five; otherwise, the adjusting equipment sends a frequency adjusting instruction to the microwave communication equipment, controls the microwave basic frequency of the microwave communication equipment to increase by one stepping unit, and returns to the first step; wherein i, j belongs to 0,1,., n, and i-j is more than or equal to 2; Δ a is a set threshold;
step five, judging whether the intermediate frequency value obtained in the step four is equal to f or not0If the two are equal, the test is finished; if not, the adjusting equipment sends a frequency adjusting instruction to the microwave communication equipment to control the microwave basic frequency of the microwave communication equipment to increaseAdding a step unit and returning to the step one.
Preferably, the specific implementation manner of step two is as follows:
a voltage comparator in the regulating equipment receives the intermediate frequency signal and is used as a first input end of the voltage comparator for input; the second input end of the voltage comparator is a set comparison reference signal; the two are compared by voltage and then output a digital signal which is transmitted to a controller which is arranged in the regulating equipment and connected with the voltage comparator; the controller calculates the output digital signal to obtain the intermediate frequency value F corresponding to the current digital signal0。
Has the advantages that:
1. the invention adopts the voltage regulation comparator to test the frequency of the intermediate frequency signal, solves the problem of measuring the frequency of the interfered intermediate frequency signal, and the intermediate frequency signal has the characteristic that the frequency changes along with the amplitude.
2. The invention adjusts the basic frequency of the microwave communication equipment or the comparison reference signal of the voltage comparator according to the judgment result on the basis of adopting the voltage comparator, namely, the invention adopts the mode of combining coarse adjustment and fine adjustment, thereby improving the efficiency of the frequency test of the intermediate frequency signal.
Drawings
Fig. 1 is a schematic diagram of the present invention for measuring a disturbed intermediate frequency signal.
Fig. 2 is a flow chart of the present invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings and two embodiments.
A method for testing the frequency of intermediate frequency signals of microwave communication equipment includes such steps as receiving and measuring the intermediate frequency signals output by the microwave communication equipment by a regulator, comparing them with a reference value, sending frequency regulation instruction to the microwave communication equipment, regulating the basic frequency of the equipment and outputting the intermediate frequency signals, and measuring and feeding back the intermediate frequency signals by the regulator.
The frequency value of the intermediate frequency signal output by the microwave communication equipment after being adjusted to the reference frequency point is f0Then the amplitude of the intermediate frequency signal is maximum at this time and is marked as a0. Wherein f is0、a0Are all known values. And starting the frequency point adjustment of the microwave communication equipment.
Step one, sending a set microwave reference frequency signal to microwave communication equipment by adjusting equipment, mixing the received microwave reference frequency signal with the microwave basic frequency of the microwave communication equipment, outputting an intermediate frequency signal, and sending the intermediate frequency signal to the adjusting equipment.
And step two, a voltage comparator in the regulating equipment receives the intermediate frequency signal and is used as a first input end of the voltage comparator for input. The second input end of the voltage comparator is a set comparison reference signal. The two are compared by voltage to output a digital signal, and the digital signal is transmitted to the regulating equipment and the controller connected with the voltage comparator. The controller calculates the output digital signal to obtain the frequency value F corresponding to the digital signal0. It should be noted that the frequency value corresponding to the digital signal is the frequency value of the intermediate frequency signal.
Step three, the controller obtains the intermediate frequency value F0And a set intermediate frequency signal frequency value f0Making a comparison if | F0-f0If | is greater than Δ f, the frequency of the current intermediate frequency signal is considered to be far less than f0And the adjusting equipment sends a frequency adjusting instruction to the microwave communication equipment to control the microwave basic frequency of the microwave communication equipment to increase by one stepping unit. And then returning to the step one. If | F0-f0If | ≦ Δ f, perform step four. Where Δ f is a frequency difference, which is summarized experimentally.
It should be noted that, the adjusting device first sends the frequency adjusting instruction to the microwave communication equipment, that is, the frequency adjusting instruction starts to be adjusted from the initial point and is adjusted in the direction of increasing the frequency, if the adjusted frequency does not reach the adjusting requirement, the frequency adjusting instruction continues to be sent, the frequency of the microwave communication equipment is required to be increased by one step unit, and in this cycle, when the frequency adjusting instruction reaches the maximum adjusting frequency point, the adjusting process is considered to be abnormal, and the adjustment is stopped.
And step four, respectively reducing the comparison reference signal of the voltage comparator in an equivalent manner, then returning to the step one until the comparison reference signal is reduced to 0, and stopping. In this process, each comparison reference signal is A0，A1，...，AnAnd A is0＞A1＞...＞An(ii) a Recording the intermediate frequency value F corresponding to the digital signal obtained by the voltage comparator under each comparison reference signal0，F1，...，Fn. If in the process, there is an interval Ai-AjIs > Δ A, and AiTo AjIf the intermediate frequency values corresponding to the digital signals obtained by the comparator under each comparison reference signal are equal, the fifth step is executed. Wherein i, j belongs to 0,1,., n, and i-j is more than or equal to 2; Δ a is the comparative reference signal difference, which is obtained from experimental summaries.
If the intermediate frequency values corresponding to the digital signals obtained by the comparator under each comparison reference signal in a certain comparison reference signal interval range are not equal, the current intermediate frequency signal frequency is considered to be still less than f0And sending a frequency adjusting instruction to the microwave communication equipment by the adjusting equipment, controlling the microwave basic frequency of the microwave communication equipment to increase by one stepping unit, and returning to the step one.
Step five, judging whether the intermediate frequency value obtained in the step four is equal to f or not0If they are equal, the frequency value is the measured output value of the measured intermediate frequency signal. If not, the adjusting equipment sends a frequency adjusting instruction to the microwave communication equipment, controls the microwave basic frequency of the microwave communication equipment to increase by one stepping unit, and returns to the step one.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A frequency test method of intermediate frequency signal used for microwave communication equipment, the regulating equipment launches the reference signal to the microwave communication equipment, the microwave communication equipment outputs the intermediate frequency signal after mixing the received reference signal with the microwave basic frequency signal of self, characterized by that, set up a voltage comparator in the regulating equipment, utilize the voltage comparator to compare the intermediate frequency signal that the microwave communication equipment outputs with the comparison reference signal that is set up in advance, obtain the frequency value of the comparison result and the comparison result; the adjusting device adjusts a basic frequency of the microwave communication equipment or a comparison reference signal of the voltage comparator according to a difference value between the frequency value of the comparison result and the expected intermediate frequency signal frequency value, and finally the microwave communication equipment stably outputs the intermediate frequency signal with the frequency value equal to the reference signal frequency value transmitted by the adjusting device;
the specific mode of the adjusting equipment is as follows: setting a threshold value, and if the difference value is greater than the set threshold value, adjusting the basic frequency of the microwave communication equipment; if the difference is smaller than or equal to a set threshold, adjusting a comparison reference signal of the voltage comparator;
the specific implementation mode is as follows:
step one, sending a set microwave reference frequency signal to microwave communication equipment by adjusting equipment, mixing the received microwave reference frequency signal with the microwave basic frequency of the microwave communication equipment, outputting an intermediate frequency signal, and sending the intermediate frequency signal to the adjusting equipment;
step two, the voltage comparator compares the intermediate frequency signal sent by the microwave communication equipment with the set comparison reference signal to obtain a comparison result and an intermediate frequency value F of the comparison result0；
Step three, adjusting the intermediate frequency value F of the obtained comparison result by the equipment0And the desired intermediate frequency signal frequency value f0Making a comparison if | F0-f0If | > delta f, the adjusting equipment sends a frequency adjusting instruction to the microwave communication equipment to control the microwave basic frequency of the microwave communication equipment to increase a step sheetA bit; then returning to the first step; if | F0-f0If the | is less than or equal to the delta f, executing the step four; wherein, Δ f is a set threshold value, and the value is obtained according to experimental summary;
step four, equivalently reducing the comparison reference signal of the voltage comparator, then returning to the step one until the comparison reference signal is reduced to 0, and stopping; recording each comparison reference signal as A0，A1，...，AnAnd A is0＞A1＞...＞An(ii) a Recording the intermediate frequency value F corresponding to the comparison result obtained by the voltage comparator under each comparison reference signal0，F1，...，Fn(ii) a If in the process A is presenti-AjIs > Δ A, and AiTo AjIf the intermediate frequency values corresponding to the comparison results obtained by the comparator under each comparison reference signal are equal, executing the step five; otherwise, the adjusting equipment sends a frequency adjusting instruction to the microwave communication equipment, controls the microwave basic frequency of the microwave communication equipment to increase by one stepping unit, and returns to the first step; wherein i, j belongs to 0,1,., n, and i-j is more than or equal to 2; Δ a is a set threshold;
step five, judging whether the intermediate frequency value obtained in the step four is equal to f or not0If the two are equal, the test is finished; if not, the adjusting equipment sends a frequency adjusting instruction to the microwave communication equipment, controls the microwave basic frequency of the microwave communication equipment to increase by one stepping unit, and returns to the step one.
2. The method for testing the frequency of the intermediate frequency signal according to claim 1, wherein the specific implementation manner of the second step is as follows:
a voltage comparator in the regulating equipment receives the intermediate frequency signal and is used as a first input end of the voltage comparator for input; the second input end of the voltage comparator is a set comparison reference signal; the two are compared by voltage and then output a digital signal which is transmitted to a controller which is arranged in the regulating equipment and connected with the voltage comparator; the controller calculates the output digital signal to obtain the intermediate frequency value F corresponding to the current digital signal0。
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| CN202815212U (en) * | 2012-10-19 | 2013-03-20 | 成都远望科技有限责任公司 | Magnetron radar frequency tracking device |
| CN103618569B (en) * | 2013-11-25 | 2016-03-02 | 中国电子科技集团公司第四十一研究所 | A kind of intermediate frequency process system of vector network analyzer and intermediate frequency process method |
| CN104316760B (en) * | 2014-10-10 | 2017-07-11 | 中国电子科技集团公司第四十一研究所 | A kind of dominant frequency signal determinating circuit and decision method for being applied to microwave frequency counter |
| CN106200751B (en) * | 2016-08-15 | 2018-02-16 | 中国电子科技集团公司第四十一研究所 | A kind of intermediate-freuqncy signal Power auto-adjustment circuit and method |
| CN106443177A (en) * | 2016-08-15 | 2017-02-22 | 中国电子科技集团公司第四十研究所 | Wide bandwidth frequency agile signal measurement instrument and measurement method |
| CN107064628B (en) * | 2017-04-13 | 2019-08-16 | 中国电子科技集团公司第二十四研究所 | High Precise Frequency Measurement System and method |
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