CN110109150B - High-precision array signal simulation device and method - Google Patents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
- G01S19/235—Calibration of receiver components
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
- G01S19/43—Determining position using carrier phase measurements, e.g. kinematic positioning; using long or short baseline interferometry
Abstract
The invention discloses a high-precision array signal simulation device and a method, comprising the following steps: the single-path intermediate frequency analog signal sent by the vector signal source is sent to the power divider after being subjected to down-conversion treatment, is divided into multiple paths of analog signals and is sent to the ADC; calculating the time delay difference of each array element receiving signal relative to a reference point; calculating the time delay difference of each array element receiving signal relative to the array element 1: calculating a time delay adjustment value; converting the delay adjustment value into a phase difference of the sampling clock: parameters of the DDS are generated by adjusting the sampling clock according to the phase difference, and the DDS generates a sampling clock with a corresponding phase; the sampling clock is converted into an analog signal through a DAC (digital-to-analog converter), the analog signal is sent to a corresponding ADC for sampling, and a digital array signal is obtained and is sent to a filter; the filter filters the signals according to the parameters, and then the signals are subjected to predistortion treatment, DAC conversion and up-conversion treatment to obtain radio frequency analog signals of each array element. The invention can realize high-precision simulation of each link, and the whole set of simulation device has simple structure, easy realization and low cost.
Description
Technical Field
The invention relates to the technical field of array signal processing, in particular to a high-precision array signal simulation device and method.
Background
The excellent characteristics of the antenna array anti-interference technology make the antenna array anti-interference technology widely applied to high-end GNSS (Global Navigation Satellite System) receivers. The darkroom is one of the important means of anti-interference antenna array test verification, but the construction cost is higher, the scene construction is complex and time-consuming, and higher signal incidence scene setting precision is difficult to obtain. Therefore, the wired test is an important means for improving the research and development efficiency of the anti-interference technology of the antenna array. The wired test requires analog array reception signals under wired conditions. The simulation of the array signal requires high accuracy control of the array delay.
The array signal simulation has high requirements on time delay control precision and is sensitive to errors, so that the array simulation is very difficult. Typical array delay variation ranges from about 0 to 0.6 nanoseconds, with delay control resolution and accuracy required to be within 0.001 nanoseconds. In addition, with the improvement of the interference suppression degree index, the resolution and the precision of the delay control also need to be further improved, and the filter characteristics of different channels are more sensitive, so that higher requirements are put on signal simulation.
The existing array signal simulation method mainly comprises three types, wherein the baseband signal phase and the carrier phase are adjusted through a baseband to realize time delay simulation; the other type adopts a phase shifter, and only phase difference is simulated; the third category employs programmable microwave delay lines. The common characteristics of the methods are that the hardware equipment is large in scale, the system structure is complex, the cost is high and the price is high. In addition, the first class cannot simulate an external irregular interference signal; the second type does not simulate time delay, so that the precision is poor, the method is only suitable for point frequency signals, and the high-precision test requirement of non-point frequency signals cannot be met; the third class has the contradiction between the time delay difference precision and the time delay difference range, and the cost for solving the contradiction is extremely expensive, and is not suitable for engineering popularization and use.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a high-precision array signal simulation device and a high-precision array signal simulation method which have low cost and simple structure and can accurately simulate an array receiving signal of a scene with any incidence angle and simulate the characteristics of a filter.
The technical scheme adopted by the invention is as follows:
a high precision array signal simulation apparatus comprising: the device comprises a vector signal source, a down converter, a power divider, a plurality of array element channels, a plurality of up converters, a time delay difference calculation module, a phase difference calculation module and a filter parameter calculation module;
the power divider is respectively connected with a plurality of array element channels, the delay difference calculation module is connected with the phase difference calculation module to be used for calculating the delay difference of a received signal and sending the delay difference to the phase difference calculation module, the phase difference calculation module is connected with the array element channels to be used for calculating the phase difference according to the delay difference and generating parameters to be sent to the array element channels, the filter parameter calculation module is connected with the array element channels to be used for sending filter parameters, the array element channels are respectively connected with corresponding up-converters to be used for carrying out delay difference processing, filtering processing and predistortion processing on data sent by the power divider and then sending the data to the up-converters, and the up-converters are used for outputting radio frequency analog signals of all the array elements after carrying out up-conversion processing on the signals sent by the array element channels.
Further, the array element channel comprises an ADC, a DDS, a first DAC, a second DAC, a filter and a predistorter, the power divider is respectively connected with a plurality of ADCs and used for converting a single-path microwave signal into a plurality of paths of microwave signals and sending the paths of microwave signals to the corresponding ADCs, the phase difference calculation module is connected with the first DDS and used for calculating a phase difference according to a time delay difference and generating parameters and sending the parameters to the DDS, the DDS is connected with the corresponding ADCs through the first DAC and used for generating sampling clocks of corresponding phases, and the sampling clocks are converted into analog signals through the first DAC and then sent to the ADCs for sampling, and the ADCs are used for obtaining digital array signals with accurate time delay differences;
the filter parameter calculation module is connected with the filter and used for sending filter parameters, the input end of the filter is connected with the output end of the ADC and used for filtering the digital array signals output by the ADC according to the filter parameters, the output end of the filter is connected with the predistorter, the output end of the predistorter is connected with the second DAC, and the output end of the second DAC is connected with the up-converter.
The high-precision array signal simulation method comprises the following steps:
s1, a single-path intermediate frequency analog signal sent by a vector signal source is sent to a power distributor after being subjected to down-conversion treatment;
s2, the power divider divides a single-channel analog signal into multiple channels of analog signals and sends the multiple channels of analog signals to the multiple ADCs respectively;
s3, a time delay difference calculation module calculates the time delay difference of each array element received signal relative to a reference point;
s4, a delay difference calculation module calculates delay differences of the array element receiving signals relative to the array element 1;
s5, uniformly superposing forward offset T on each time delay difference by the time delay difference calculation module 0 Obtaining delay line delay adjustment values and sending the delay line delay adjustment values to a phase difference calculation module;
s6, the phase difference calculation module converts the time delay adjustment value into a phase difference of a sampling clock:
s7, the phase difference calculation module adjusts parameters of the sampling clock to generate a DDS according to the phase difference, and the DDS generates a sampling clock with a corresponding phase;
s8, converting the sampling clock into an analog signal through a first DAC, sending the analog signal to a corresponding ADC for sampling to obtain a digital array signal and outputting the digital array signal to a filter;
s9, measuring gain patterns and frequency response patterns of the receiving antenna in different directions in advance and the incidence direction of current simulation, inputting the gain patterns and the frequency response patterns into a filter parameter calculation module, extracting corresponding filter parameters, sending the corresponding filter parameters to a filter, and filtering digital array signals output by an ADC (analog to digital converter);
s10, sending the filtered signals into a predistorter for predistortion treatment;
s11, converting the signal after the predistortion treatment into an analog signal through a second DAC, and performing up-conversion treatment to obtain radio frequency analog signals of each array element.
Further, the calculation formula in the step S3 is as follows
wherein ,
for signal j incidence angle vector, ">
τ is the direction vector corresponding to the angle of incidence ij Is the delay difference between the incidence of the jth signal to the ith element and the incidence to the reference point.
Further, the calculation formula in the step S4 is as follows
Further, the calculation formula in the step S5 is as follows
wherein ,
is the forward offset.
Further, the conversion formula in the step S6 is as follows
wherein ,fs Is the sampling rate.
Further, the predistortion processing parameters in the step S10 are obtained by measuring the characteristics of the up-conversion channel.
The invention has the beneficial effects that:
the invention adopts a mode of digitally controlling phase difference to realize simulation of time delay difference, has good adaptability, is suitable for any array type (linear array type, plane array type, three-dimensional array type and the like), any signal frequency and any signal number, can accurately simulate any number of microwave signals to be simultaneously incident to the receiving signals of any antenna array type from any different angles, increases filter characteristic simulation and predistortion treatment, can realize high-precision simulation of each link, and has simple structure, easy realization and low cost.
Drawings
FIG. 1 is a flow chart of a high-precision array signal simulation method of the present invention;
FIG. 2 is a schematic diagram of a high-precision array signal simulation device according to the present invention.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
The invention discloses a high-precision array signal simulation device as shown in fig. 2, which comprises: the device comprises a vector signal source, a down converter, a power divider, a plurality of ADCs, a plurality of DDSs, a plurality of DACs, a plurality of filters, a plurality of predistorters, an up converter, a time difference calculation module, a phase difference calculation module and a filter parameter calculation module;
the vector signal source is connected with the down converter for carrying out down conversion treatment on intermediate frequency analog signals, the down converter is connected with the power distributor, the power distributor is respectively connected with the ADCs for converting a single-path microwave signal into a plurality of paths of microwave signals and sending the paths of microwave signals to the corresponding ADCs, the delay difference calculation module is connected with the phase difference calculation module for calculating the delay difference of a received signal and sending the delay difference to the phase difference calculation module, the phase difference calculation module is respectively connected with the DDS for generating a phase difference calculated according to the delay difference and generating parameters and sending the parameters to the DDS, the DDS is connected with the corresponding ADCs through the DACs for generating sampling clocks of corresponding phases, the sampling clocks are converted into analog signals through the DACs and then sent to the ADCs for sampling, and the ADCs are used for obtaining digital array signals with accurate delay differences;
the filter parameter calculation module is connected with the filter and used for sending filter parameters, the input end of the filter is connected with the output end of the ADC and used for filtering the digital array signals output by the ADC according to the filter parameters, the output end of the filter is connected with the predistorter, the output end of the predistorter is connected with the DAC, and the output end of the DAC is connected with the up-converter and used for outputting radio frequency analog signals of each array element after up-conversion processing.
Fig. 1 shows a high-precision array signal simulation method using the device, which comprises the following steps:
s1, a single-path intermediate frequency analog signal sent by a vector signal source is sent to a power distributor after being subjected to down-conversion treatment;
s2, the power divider divides a single-path analog signal into multiple paths of analog signals and sends the multiple paths of analog signals to a plurality of analog-to-digital converters (ADCs);
s3, a delay difference calculation module calculates the delay difference of each array element received signal relative to a reference point, wherein a calculation formula is as follows
wherein ,
for signal j incidence angle vector, ">
Is the direction vector corresponding to the incident angle. τ ij The time delay difference between the j-th signal incident to the i-th array element and the reference point;
s4, a delay difference calculation module calculates the delay difference of each array element receiving signal relative to the array element 1, wherein a calculation formula is as follows
S5, uniformly superposing forward offset T on each time delay difference by the time delay difference calculation module 0 Obtaining the delay adjustment value of each delay line,
wherein ,/>
As the forward offset, the delay differences calculated according to the step S4 usually have negative numbers, so that all the delay differences need to be superimposed by the forward offset uniformly, and the delay of each channel is greater than 0;
s6, the phase difference calculation module converts the time delay adjustment value into the phase difference of the sampling clock, and the conversion formula is that
wherein ,fs Is the sampling rate;
s7, the phase difference calculation module adjusts parameters of a sampling clock to generate a DDS (direct digital frequency synthesizer) according to the phase difference, and the DDS generates a sampling clock with a corresponding phase;
s8, the sampling clock is converted into an analog signal through a first DAC (digital-to-analog converter), and the analog signal is sent to a corresponding ADC for sampling, so that a digital array signal is obtained and is output to a filter;
s9, measuring gain patterns and frequency response patterns of the receiving antenna in different directions in advance and the incidence direction of current simulation, inputting the gain patterns and the frequency response patterns into a filter parameter calculation module, extracting corresponding filter parameters, sending the corresponding filter parameters to a filter, and filtering digital array signals output by an ADC (analog to digital converter);
s10, sending the filtered signal into a predistorter for predistortion treatment, wherein predistortion treatment parameters are obtained by measuring the characteristics of an up-conversion channel, and the obtaining method is a conventional method;
s11, converting the signal after the predistortion treatment into an analog signal through a second DAC, and performing up-conversion treatment to obtain radio frequency analog signals of each array element.
In summary, the invention adopts a mode of digitally controlling phase difference to realize simulation of time delay difference, has good adaptability, is suitable for any array type (linear array type, plane array type, three-dimensional array type and the like), any signal frequency and any signal number, can accurately simulate any number of microwave signals to be simultaneously incident to any antenna array type receiving signals from any different angles, increases filter characteristic simulation and predistortion treatment, can realize high-precision simulation of each link, and has simple structure, easy realization and low cost.
The foregoing is only illustrative of the present invention and is not to be construed as limiting the scope of the invention, and all equivalent changes made by the description of the invention and the accompanying drawings, or direct or indirect application in the relevant art, are intended to be included within the scope of the invention.
Claims (6)
1. The high-precision array signal simulation method is operated in a high-precision array signal simulation device, the high-precision array signal simulation device comprises a vector signal source, a down converter, a power distributor, a plurality of array element channels, a plurality of up converters, a time delay difference calculation module, a phase difference calculation module and a filter parameter calculation module, wherein the vector signal source is connected with the down converter, the down converter is connected with the power distributor, the power distributor is respectively connected with a plurality of array element channels, the time delay difference calculation module is connected with the phase difference calculation module, the phase difference calculation module is connected with the array element channels, the array element channels are respectively connected with the corresponding up converters, the array element channels comprise an ADC (analog to digital converter), a DDS (digital to analog converter), a first DAC (digital to analog converter), a second DAC (digital to digital converter), a filter and a predistorter, the phase difference calculation module is connected with the DDS, the filter parameter calculation module is connected with the filter, the input end of the filter is connected with the output end of the ADC, the output end of the filter is connected with the predistorter, the output end of the predistorter is connected with the output end of the second DAC, and the output end of the predistorter is connected with the output end of the predistorter, and the output end of the output device is characterized by the output end.
S1, a single-path intermediate frequency analog signal sent by a vector signal source is sent to a power distributor after being subjected to down-conversion treatment;
s2, the power divider divides a single-channel analog signal into multiple channels of analog signals and sends the multiple channels of analog signals to the multiple ADCs respectively;
s3, a time delay difference calculation module calculates the time delay difference of each array element received signal relative to a reference point;
s4, a delay difference calculation module calculates delay differences of the array element receiving signals relative to the array element 1;
s5, uniformly superposing forward offset T on each time delay difference by the time delay difference calculation module 0 Obtaining delay line delay adjustment values and sending the delay line delay adjustment values to a phase difference calculation module;
s6, the phase difference calculation module converts the time delay adjustment value into a phase difference of a sampling clock:
s7, the phase difference calculation module adjusts parameters of the sampling clock to generate a DDS according to the phase difference, and the DDS generates a sampling clock with a corresponding phase;
s8, converting the sampling clock into an analog signal through a first DAC, sending the analog signal to a corresponding ADC for sampling to obtain a digital array signal and outputting the digital array signal to a filter;
s9, measuring gain patterns and frequency response patterns of the receiving antenna in different directions in advance and the incidence direction of current simulation, inputting the gain patterns and the frequency response patterns into a filter parameter calculation module, extracting corresponding filter parameters, sending the corresponding filter parameters to a filter, and filtering digital array signals output by an ADC (analog to digital converter);
s10, sending the filtered signals into a predistorter for predistortion treatment;
s11, converting the signal after the predistortion treatment into an analog signal through a second DAC, and performing up-conversion treatment to obtain radio frequency analog signals of each array element.
2. The high-precision array signal simulation method according to claim 1, wherein: the calculation formula in the step S3 is as follows:
3. the high-precision array signal simulation method according to claim 2, wherein: the calculation formula in the step S4 is as follows
wherein ,
for the delay difference of each array element relative to array element 1, < >>
Is a delay difference matrix of each array element relative to the array element 1.
4. A high-precision array signal simulation method according to claim 3, wherein: the calculation formula in the step S5 is as follows
wherein ,
in the case of a positive-going offset,Lfor the delay adjustment value, +.>
The value matrix is adjusted for time delay.
5. The high-precision array signal simulation method according to claim 4, wherein: the conversion formula in the step S6 is as follows
wherein ,
for sampling rate +.>
For the phase difference of the sampling clock, +.>
Is a phase difference matrix of the sampling clock.
6. The high-precision array signal simulation method according to claim 1, wherein: the predistortion processing parameters are obtained in step S10 by measuring the characteristics of the up-conversion channel.
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