阅读说明：本技术 一种卫星信号带外多余辐射谱密度测试数据处理方法 (Method for processing satellite signal out-of-band redundant radiation spectrum density test data ) 是由 皇甫松涛 谢军 刘鹤 崔永军 王妍 申洋赫 刘天雄 曹多梅 刘哲 张翼 于 2020-10-30 设计创作，主要内容包括：本发明公开了一种卫星信号带外多余辐射谱密度测试数据处理方法,包括：步骤1,确定计量设备和被标校设备,并将频率范围划分为信号带宽内区域和信号带宽外关注区域；步骤2,计算得到计量设备和被标校设备在信号带宽外关注区域的标校结果；步骤3,利用被标校设备开展带外多余辐射功率谱密度测试,并根据标校结果,得到带外多余辐射功率谱密度测试结果。本发明能够减少地面测试设备的差异对测试结果一致性的影响,给出准确的数据横纵向比对结果,解决了测试设备带来的底噪差异对测试结果影响的问题。(The invention discloses a method for processing satellite signal out-of-band redundant radiation spectral density test data, which comprises the following steps: step 1, determining a metering device and a calibrated device, and dividing a frequency range into a signal bandwidth inner area and a signal bandwidth outer interest area; step 2, calculating to obtain calibration results of the metering equipment and the calibrated equipment in the region of interest outside the signal bandwidth; and 3, carrying out-of-band redundant radiation power spectrum density test by using the calibrated equipment, and obtaining an out-of-band redundant radiation power spectrum density test result according to the calibration result. The invention can reduce the influence of the difference of ground test equipment on the consistency of the test result, give an accurate data transverse and longitudinal comparison result and solve the problem that the test result is influenced by the bottom noise difference brought by the test equipment.)

1. A satellite signal out-of-band redundant radiation spectral density test data processing method is characterized by comprising the following steps:

step 1, determining a metering device and a calibrated device, and dividing a frequency range into a signal bandwidth inner area and a signal bandwidth outer interest area;

step 2, calculating to obtain calibration results of the metering equipment and the calibrated equipment in the region of interest outside the signal bandwidth;

and 3, carrying out-of-band redundant radiation power spectrum density test by using the calibrated equipment, and obtaining an out-of-band redundant radiation power spectrum density test result according to the calibration result.

2. The method for processing the satellite signal out-of-band unnecessary radiation spectral density test data according to claim 1, wherein the step of calculating the calibration result of the metering device and the calibrated device in the region of interest outside the signal bandwidth comprises the following steps:

a substep 21 of measuring the peak value a of the measured satellite in the signal bandwidth by using the spectrometer under the measuring equipment_f1；

Substep 22, setting N equal interval frequency points f in the signal bandwidth₁、f₂、...、f_NIs recorded as a frequency point vectorCompleting self-calibration of the metering equipment;

substep 23, at frequency point f₁Respectively adding single carrier signals with constant amplitude by using a signal source, and adjusting the amplitude of the signal source after passing through a radio frequency cable under the metering equipment to maintain a peak point of a region in a signal bandwidth of a frequency spectrograph under the metering equipment_f1And reading the signal amplitude mean value wa of the region of interest outside the signal bandwidth₁；

Substep 24, at frequency point f₁The signal source is utilized to add single carrier signals with constant amplitude respectively, and the amplitude of the signal source is adjusted after the single carrier signals pass through a radio frequency cable under the calibrated equipment, so that the peak point of the region of the frequency spectrograph under the calibrated equipment in the signal bandwidth is maintained at a_f1And reading the signal amplitude mean value wb of the region of interest outside the signal bandwidth₁；

Substep 25, according to wa₁And wb₁To obtain a calibration result d₁(ii) a Wherein d is₁＝wa₁-wb₁；

Substep 26 of vector at frequency pointFrequency point f₂、...、f_NRepeating the substep 22 to the substep 24 to obtain N calibration result vectors

3. The method for processing the out-of-band unwanted radiation spectral density test data of the satellite signal according to claim 2, wherein the step of performing the out-of-band unwanted radiation spectral density test by using the calibrated device and obtaining the out-of-band unwanted radiation spectral density test result according to the calibration result comprises:

substep 31, using the calibrated device to perform out-of-band unnecessary radiation power spectrum density test, and obtaining the maximum value w of the out-of-bandwidth region of interest amplitude by measuring with a frequency spectrograph under the calibrated device_iAnd in the signal bandwidthPeak value a_f1Corresponding measurement frequency point f'_i；

Substep 32, obtaining the measurement frequency point f 'according to substep 31'_iDetermining the absolute value vector of the frequency point position difference

Substep 33, ifThen change r to a_f1-(w_i-d_j) And outputting the test result as the out-of-band unnecessary radiation power spectral density.

4. The method according to claim 1, wherein the method for processing the spectral density test data of the extra-band unnecessary radiation of the satellite signal,

the measuring equipment detects, satisfies the equipment that the measuring accuracy required for passing through the measurement, includes: a signal source, a radio frequency cable and a spectrometer;

the calibrated device is used for failing to pass the metering detection and comprises: radio frequency cables, attenuators, and spectrometers.

5. The method for processing the test data of the out-of-band unnecessary radiation power spectral density of the satellite signal according to claim 1, wherein the results of the test of the out-of-band unnecessary radiation power spectral density with comparability can be obtained by repeating the steps 1 to 3 when the out-of-band unnecessary radiation power spectral density of the same satellite or the same satellite is tested at different stages.

Technical Field

The invention belongs to the technical field of satellite radio frequency signals, and particularly relates to a method for processing satellite signal out-of-band redundant radiation spectrum density test data.

Background

Due to the non-ideal characteristics of the filter, the non-linear intermodulation characteristics of the radio frequency transmission medium and other factors, redundant frequency spectrum components exist outside the designed signal bandwidth in the satellite radio frequency signal transmitting system, and the satellite radio frequency signal transmitting system is called as out-of-band redundant radiation of the satellite radio frequency signal. In a transmitting and receiving shared system, especially under the condition of asymmetric power, such as a communication satellite, a navigation satellite and the like, the influence of an out-of-band redundant radiation product on a receiving system cannot be ignored; in addition, the extra radiation product outside the band will also affect other radio subsystems, which is not good for the work of international radio frequency applications. Therefore, the out-of-band unnecessary radiation power spectral density of the satellite radio frequency signal is one of the key indexes of the satellite, and some invention patents at home and abroad are specially described for a method and a device for evaluating the influence of the out-of-band signal on a radio system.

However, the noise of the electronic equipment of the ground test system is always doped in the useful signal inevitably, the amplitude of the out-of-band unwanted radiation product is often low, and the noise of the equipment is found to interfere with and even submerge the out-of-band unwanted radiation signal in the test process, as shown in fig. 1. Therefore, the test equipment differences participating in the satellite test, especially the bottom noise differences brought by a frequency spectrograph, a cable and an attenuator, influence the consistency of test data results, and the transverse comparison of the same satellite and the longitudinal comparison of the same satellite at different stages cannot be carried out.

Disclosure of Invention

The technical problem of the invention is solved: the method for processing the satellite signal out-of-band redundant radiation spectrum density test data is capable of reducing the influence of the difference of ground test equipment on the consistency of test results, giving an accurate data transverse and longitudinal comparison result and solving the problem that the test result is influenced by the background noise difference caused by the test equipment.

In order to solve the technical problem, the invention discloses a method for processing satellite signal out-of-band redundant radiation spectrum density test data, which comprises the following steps:

step 1, determining a metering device and a calibrated device, and dividing a frequency range into a signal bandwidth inner area and a signal bandwidth outer interest area;

step 2, calculating to obtain calibration results of the metering equipment and the calibrated equipment in the region of interest outside the signal bandwidth;

and 3, carrying out-of-band redundant radiation power spectrum density test by using the calibrated equipment, and obtaining an out-of-band redundant radiation power spectrum density test result according to the calibration result.

In the method for processing the satellite signal out-of-band redundant radiation spectrum density test data, the calibration result of the metering device and the calibrated device in the region of interest outside the signal bandwidth is obtained by calculation, and the method comprises the following steps:

a substep 21 of measuring the peak value a of the measured satellite in the signal bandwidth by using the spectrometer under the measuring equipment_f1；

Substep 22, setting N equal interval frequency points f in the signal bandwidth₁、f₂、...、f_NIs recorded as a frequency point vectorCompleting self-calibration of the metering equipment;

substep 23, at frequency point f₁Respectively adding single carrier signals with constant amplitude by using a signal source, and adjusting the amplitude of the signal source after passing through a radio frequency cable under the metering equipment to maintain a peak point of a region in a signal bandwidth of a frequency spectrograph under the metering equipment_f1And reading the signal amplitude mean value wa of the region of interest outside the signal bandwidth₁；

Substep 24, at frequency point f₁The signal source is utilized to add single carrier signals with constant amplitude respectively, and the amplitude of the signal source is adjusted after the single carrier signals pass through a radio frequency cable under the calibrated equipment, so that the peak point of the region of the frequency spectrograph under the calibrated equipment in the signal bandwidth is maintained at a_f1And reading the signal amplitude mean value wb of the region of interest outside the signal bandwidth₁；

Substep 25, according to wa₁And wb₁To obtain a calibration result d₁(ii) a Wherein d is₁＝wa₁-wb₁；

Substep 26 of vector at frequency pointFrequency point f₂、...、f_NRepeating the substep 22 to the substep 24 to obtain N calibration result vectors

In the above method for processing data of testing out-of-band unwanted radiation power spectral density of satellite signals, the method uses calibrated equipment to perform out-of-band unwanted radiation power spectral density test, and obtains a test result of out-of-band unwanted radiation power spectral density according to the calibration result, and includes:

substep 31, using the calibrated device to perform out-of-band unnecessary radiation power spectrum density test, and obtaining the maximum value w of the out-of-bandwidth region of interest amplitude by measuring with a frequency spectrograph under the calibrated device_iAnd the peak value a of the region within the signal bandwidth_f1Corresponding measurement frequency point f'_i；

Substep 32, obtaining the measurement frequency point f 'according to substep 31'_iDetermining the absolute value vector of the frequency point position difference

Substep 33, ifThen change r to a_f1-(w_i-d_j) And outputting the test result as the out-of-band unnecessary radiation power spectral density.

In the above method for processing the out-of-band unnecessary radiation spectral density test data of the satellite signal,

the measuring equipment detects, satisfies the equipment that the measuring accuracy required for passing through the measurement, includes: a signal source, a radio frequency cable and a spectrometer;

the calibrated device is used for failing to pass the metering detection and comprises: radio frequency cables, attenuators, and spectrometers.

In the method for processing the test data of the out-of-band redundant radiation power spectral density of the satellite signal, the out-of-band redundant radiation power spectral density of the same satellite or the same satellite at different stages is tested, and the step 1 to the step 3 are repeated to obtain a comparable out-of-band redundant radiation power spectral density test result.

The invention has the following advantages:

(1) the invention discloses a method for processing satellite signal out-of-band redundant radiation spectral density test data, which is characterized in that all test errors are normalized to the measurement errors of the same metering equipment, so that when multiple sets of equipment carry out a multi-satellite out-of-band redundant radiation power spectral density test in parallel, the influence of ground equipment differences, especially background noise differences, on a test result can be reduced, thus data multi-satellite consistency comparison can be effectively carried out, and a successful envelope line is established.

(2) The invention discloses a method for processing satellite signal out-of-band redundant radiation spectral density test data, which can eliminate the influence of ground equipment difference on a test result when multiple sets of equipment participate in the same satellite out-of-band redundant radiation spectral density test, thereby effectively carrying out the consistency comparison of different stages of satellite data, such as the comparison of a thermal test and normal temperature and pressure data, and accurately analyzing whether the satellite state changes.

Drawings

FIG. 1 is a schematic diagram illustrating the effect of differences in a ground test system on test data according to an embodiment of the present invention;

FIG. 2 is a flowchart illustrating steps of a method for processing data of out-of-band unwanted radiation spectral density test of satellite signals according to an embodiment of the present invention;

FIG. 3 is a block diagram of a calibration processing scheme according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a calibration process in an embodiment of the invention;

FIG. 5 is a diagram illustrating a connection of a test system according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 2, in this embodiment, the method for processing out-of-band unwanted radiation spectral density test data of a satellite signal includes:

step 1, determining a metering device and a calibrated device, and dividing a frequency range into a signal bandwidth inner area and a signal bandwidth outer interest area.

In this embodiment, the metering device is a device that passes through metering detection and meets the requirement of test accuracy, and includes: signal source, radio frequency cable and spectrometer. The calibrated device is used for failing to pass the metering detection and comprises: radio frequency cables, attenuators, and spectrometers.

And 2, calculating to obtain calibration results of the metering equipment and the calibrated equipment in the region of interest outside the signal bandwidth.

In this embodiment, step 2 may specifically include: a substep 21 of measuring the peak value a of the measured satellite in the signal bandwidth by using the spectrometer under the measuring equipment_f1. Substep 22, setting N equal interval frequency points f in the signal bandwidth₁、f₂、...、f_NIs recorded as a frequency point vectorAnd finishing the self-calibration of the metering equipment. Substep 23, at frequency point f₁Respectively adding single carrier signals with constant amplitude by using a signal source, and adjusting the amplitude of the signal source after passing through a radio frequency cable under the metering equipment to maintain a peak point of a region in a signal bandwidth of a frequency spectrograph under the metering equipment_f1And reading the signal amplitude mean value wa of the region of interest outside the signal bandwidth₁. Substep 24, at frequency point f₁The signal source is utilized to add single carrier signals with constant amplitude respectively, and the amplitude of the signal source is adjusted after the single carrier signals pass through a radio frequency cable under the calibrated equipment, so that the peak point of the region of the frequency spectrograph under the calibrated equipment in the signal bandwidth is maintained at a_f1And reading the signal amplitude mean value wb of the region of interest outside the signal bandwidth₁. Substep 25, according to wa₁And wb₁To obtain a calibration result d₁(ii) a Wherein d is₁＝wa₁-wb₁. Substep 26 of vector at frequency pointFrequency point f₂、...、f_NRepeating the substep 22 to the substep 24 to obtain N calibration result vectors

And 3, carrying out-of-band redundant radiation power spectrum density test by using the calibrated equipment, and obtaining an out-of-band redundant radiation power spectrum density test result according to the calibration result.

In this embodiment, step 3 may specifically include: substep 31, using the calibrated device to perform out-of-band unnecessary radiation power spectrum density test, and obtaining the maximum value w of the out-of-bandwidth region of interest amplitude by measuring with a frequency spectrograph under the calibrated device_iAnd the peak value a of the region within the signal bandwidth_f1Corresponding measurement frequency point f'_i. Substep 32, obtaining the measurement frequency point f 'according to substep 31'_iDetermining the absolute value vector of the frequency point position differenceSubstep 33, ifThen change r to a_f1-(w_i-d_j) And outputting the test result as the out-of-band unnecessary radiation power spectral density.

And 3, repeating the steps 1 to 3 to test the out-of-band redundant radiation power spectral density of the same satellite or different stages of the same satellite, so as to obtain a comparable out-of-band redundant radiation power spectral density test result.

On the basis of the above-described embodiments, the following description is made with reference to an example.

The method is applied to the test of the out-of-band redundant radiation power spectral density of the satellite radio frequency signal. The central frequency point f of the measured signal of a certain batch of satellites is 1.6GHz, and the bandwidth of the signal is 20MHz (f-10 MHz-f +10 MHz). The out-of-band concern area is divided into an upper sideband and a lower sideband, the frequency range of the upper sideband is f +35 MHz-f +40MHz, the frequency range of the lower sideband is f-35 MHz-f-15 MHz, the difference between the peak value of the area in the signal bandwidth and the maximum value of the amplitude of the out-of-bandwidth concern area needs to be measured and used as the test result of the out-of-band redundant radiation power spectral density of the satellite radio frequency signal, and meanwhile, the consistency comparison of the test result among the satellites in batch production and in each stage of the same satellite needs to be carried out. The implementation mode is as follows:

1) a metering device is prepared.

A metrology apparatus, comprising: signal source, radio frequency cable and spectrometer. In the embodiment, Keysight E8267D is used as a signal source, Keysight N9030A is used as a spectrometer, and a phase-stabilizing cable matched with Keysight N5244A is used as a radio frequency cable.

2) And preparing the calibrated equipment.

Calibrated device, comprising: radio frequency cables, attenuators, and spectrometers. In the embodiment, a Rayleigh signal TNC-N10 m coaxial cable is used as a radio frequency cable, Weinschel 58-40-33 is used as an attenuator, and Agilent E4440A is used as a frequency spectrograph.

3) Considering that the in-band power of the signal is much higher than the noise of the electronic device of the test system, and therefore the test system has a limited influence on the peak power of the in-band signal (measured within 0.5 dB), the test system is connected according to fig. 5, and the measurement is performed on the tested piece 1, so that: peak amplitude point a of the signal bandwidth_f1Frequency position f 'corresponding to amplitude peak value'_iAnd maximum value w of amplitude of attention region outside bandwidth_i. Wherein, the resolution bandwidth RBW of the spectrometer E4440A is set to 100KHz, and the video bandwidth VBW is set to 3 KHz.

4) To convert satellite signalsThe area in the bandwidth is divided into 20 frequency points with equal intervals, and the frequency point vector isThe metering system is connected according to the metering step part of the attached figure 3;

5) in the metering apparatus, at f by signal source E8267D₁Generating a single carrier signal at a frequency point, reading the peak point amplitude by using a Keysight N9030A high-performance spectrometer after passing through a phase-stabilizing cable, setting a resolution bandwidth RBW of N9030A as 100KHz, and setting a video bandwidth VBW as 3 KHz; the Amplitude (AMP) of the signal source E8267D was adjusted such that the N9030A peak point amplitude value read as a_f1Reading the frequency parts N9030A of the upper sideband and the lower sideband of the out-of-band attention area to measure amplitude values to obtain an amplitude mean value wa of the calibration area₁。

6) The calibration system is connected in part according to the calibration procedure of FIG. 3, at f via a signal source E8267D₁A signal source is used for adding a single carrier signal at a frequency point, after passing through a radio frequency cable and an attenuator, the amplitude of a peak point is read by using a frequency spectrograph Agilent E4440A, the E4440A resolution bandwidth RBW is set to be 100KHz, and the video bandwidth VBW is set to be 3 KHz; the Amplitude (AMP) of the signal source E8267D is adjusted such that the E4440A peak point amplitude value reads a_f1Reading the upper sideband and lower sideband frequency parts E4440A of the out-of-band attention area to measure amplitude values to obtain an amplitude mean value wb of a calibration area₁。

7) Calibrating the area amplitude mean value wb by a calibration step₁And measuring step for calibrating area amplitude mean value wa₁Obtaining the calibration result d₁＝wa₁-wb₁。

8) At f by signal source E8267D₂...f₂₀Generating single carrier signals at frequency points, and repeating the steps 6) to 7) to obtain 20 calibration result vectors

9) Using the frequency location measurement f 'of the occurrence of regional peaks within the bandwidth of the signal of step 3)'_iConstructing a vector

10) If it isThen using the measured value a of the amplitude peak of the region in the signal bandwidth of step 3)_f1And the measured value w of the maximum amplitude point of the out-of-bandwidth concern region_i，r＝a_f1-(w_i-d_j) Namely the processing result of the power spectral density of the extra radiation outside the satellite band.

11) And (3) testing the out-of-band redundant radiation power spectral density of the same satellite or different stages of the same satellite, and repeating the steps 1) to 10), so as to obtain a comparable test result, wherein the effects before and after the treatment are shown in the following table 1:

TABLE 1 comparison of Effect before and after treatment

It should be noted that the out-of-band unwanted radiation power spectral density difference of the same satellite at different stages is 0.5dB, and the out-of-band unwanted radiation power spectral density difference between different satellites is regarded as being consistent within 3 dB.

In summary, the invention discloses a method for processing satellite signal out-of-band redundant radiation spectral density test data, which is a method for correcting a satellite radio frequency signal out-of-band redundant radiation power spectral density measurement result by taking the difference between the amplitude average values of a calibration system and a measurement system in relation to a satellite radio frequency signal out-of-band concerned area (calibration area) as a calibration result, so as to unify all test errors to the same measurement error of the measurement system with higher index. Therefore, when a plurality of sets of equipment parallelly carry out a multi-satellite out-of-band redundant radiation power spectrum density test, the influence of ground equipment difference, particularly the influence of background noise difference on a test result can be reduced, so that data consistency comparison can be effectively carried out, and a successful envelope line is established; meanwhile, the consistency comparison of different stages of data of the satellite, such as the comparison of a thermal test and normal temperature and pressure data, can be effectively carried out, and whether the state of the satellite changes or not can be accurately analyzed.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.

Those skilled in the art will appreciate that the invention may be practiced without these specific details.