CN102437821A - Device and method for linearization of synthetic aperture radar transmitter - Google Patents
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Abstract
The invention relates to a device and a method for linearization of a synthetic aperture radar transmitter. A digital predistortion device is arranged at the front end of the synthetic aperture radar transmitter system, digital signals to be transmitted are subjected to nonlinear disturbance in advance, and a distortion signal is generated; and the distortion signal is complementary with nonlinear characteristics of a power amplifier after passing through the power amplifier, so that a transmitting signal with amplified linearity is acquired. According to the device and the method, the nonlinear correction of the transmitting signal of a synthetic aperture radar can be realized, the linearity of the power amplifier of the radar transmitter is improved, the resolution performance of a synthetic aperture radar transmitter system is improved, and the synthetic aperture radar transmitter system with high linearity is realized.
Description
Technical Field
The invention relates to a linearization device and method adopting digital predistortion, in particular to a linearization device and method suitable for a synthetic aperture radar transmitter, and belongs to the linearization field of synthetic aperture radar transmitter systems.
Background
The synthetic aperture radar specifically comprises the following components: the relative motion between radar and target object is used to synthesize the real antenna aperture with small size into a radar with larger equivalent antenna aperture by data processing method, which features higher resolution. The synthetic aperture radar is mainly used in the fields of aviation measurement, aviation remote sensing, satellite marine observation, aerospace reconnaissance, radar guidance and the like.
The key to realizing the high resolution of the synthetic aperture radar is the pulse compression of radar echo signals, and the reduction of the linearity of a radar system can directly influence the pulse compression, so that the resolution is reduced. Because the synthetic aperture radar generally has wider system bandwidth, in order to ensure the resolution of a radar system, a high linearity requirement is provided for a power amplifier of a radar transmitter.
Therefore, it is necessary to provide a linearization apparatus and method for improving the linearity of the power amplifier of the radar transmitter.
Disclosure of Invention
The invention aims to provide a linearization device and a linearization method of a synthetic aperture radar transmitter, which can realize nonlinear correction of synthetic aperture radar transmitted signals, improve the linearity of a power amplifier of the radar transmitter, improve the resolution performance of a synthetic aperture radar system and realize a high-linearity synthetic aperture radar system.
In order to achieve the above object, the present invention provides a linearization device of a synthetic aperture radar transmitter, which is connected to a power amplifier of the synthetic aperture radar transmitter through a circuit, and the linearization device specifically includes a digital signal generator, a digital predistorter, a signal conversion module, a frequency conversion module, and a feedback module, which are connected through a circuit.
The digital signal generator generates a digital intermediate frequency broadband radar signal.
The digital predistorter is connected with the output end of the digital signal generator and is used for carrying out predistortion processing on the digital intermediate frequency broadband radar signal according to the set predistortion parameters; and comparing the real-time predistortion parameters with the received feedback digital intermediate-frequency signal output by the power amplifier, obtaining the real-time predistortion parameters of the digital predistorter through a predistortion adaptive algorithm, and updating the parameters of the digital predistorter.
The digital predistorter comprises a replication predistorter and a training predistorter which have the same structure.
A one-dimensional lookup table is arranged in the training predistorter, and predistortion parameters are respectively arranged in the one-dimensional lookup table corresponding to each table address.
The signal conversion module comprises a digital-to-analog converter and an analog-to-digital converter; the digital-to-analog converter is connected with the output end of the replica predistorter, and is used for performing digital-to-analog conversion on the digital intermediate frequency broadband radar signal subjected to predistortion processing to form and output an analog intermediate frequency broadband radar signal.
The frequency conversion module is connected between the output end of the digital-to-analog converter and the input end of the power amplifier and consists of a frequency mixer and a first filter; and a frequency mixer of the frequency conversion module converts the received analog intermediate frequency broadband radar signal into a radio frequency signal, and the radio frequency signal is filtered by a first filter and then transmitted to a power amplifier.
The feedback module is connected with the output end of the power amplifier and consists of a coupler, a down converter and a second filter; and a coupler of the feedback module receives the feedback radio frequency signal output by the power amplifier, performs coupling attenuation on the feedback radio frequency signal, forms a feedback intermediate frequency signal through a down converter, and finally outputs the feedback intermediate frequency signal after being filtered by a second filter.
The analog-to-digital converter is connected between the output end of the feedback module and the feedback input end of the digital predistorter, receives the feedback intermediate frequency signal output by the feedback module, performs analog-to-digital conversion on the feedback intermediate frequency signal, and then transmits the feedback intermediate frequency signal to the feedback input end of the digital predistorter.
The invention provides a linearization method of a synthetic aperture radar transmitter, which specifically comprises the following steps:
step 3, the training predistorter obtains real-time predistortion parameter update of the current training predistorter through a self-adaptive LMS algorithm;
step 4, the training predistorter completes one-time self-adaptive updating, and the obtained real-time predistortion parameters of the current training predistorter and the updated one-dimensional query table are copied to the copying predistorter;
and 5, repeating the operations of the steps 1 to 4 until the outputs of the replication predistorter and the training predistorter are the same, namely the inputs of the replication predistorter and the training predistorter are also the same, thereby realizing the linearization process of the output of the power amplifier.
The step 2 specifically comprises the following steps: training predistorter based on feedback digital intermediate frequency signal output by power amplifier
Amplitude value ofCalculating to obtain the table address mapped in the one-dimensional lookup tableAnd
point in between
Upper, and point
Closer to(ii) a Wherein X =1, 2, … …, X; x represents the table length of the one-dimensional lookup table;
according to the current one-dimensional look-up table
、
Corresponding table entry value
、
The input signal can be obtained by linear interpolation
Corresponding pre-disturbance component：
；
According to the pre-disturbance component
And calculating an output signal of the pre-distortion processing of the training pre-distorter (22):
。
the step 3 specifically comprises the following steps:
；
wherein,
is an iteration step size and is a non-negative constant;
the method comprises the steps of training an input signal of a predistorter, namely a feedback digital intermediate frequency signal output by a power amplifier;
the method comprises the steps of outputting an expected response signal for a replica predistorter, namely a digital intermediate frequency broadband radar signal subjected to predistortion processing by the replica predistorter;
the signal is an output signal subjected to predistortion processing by a training predistorter;
then isAnd
the error value of (1);
for training the coefficient of the lookup table of the predistorter, namely the table entry value corresponding to the address of the one-dimensional lookup table obtained by the amplitude calculation of the input signal；I.e. the updated value of the real-time predistortion parameters of the currently trained predistorter.
The linearization device and method of the synthetic aperture radar transmitter can realize the nonlinear correction of synthetic aperture radar transmitting signals, so that the distortion of the radar transmitting signals is smaller, and the linearity of the power amplifier of the radar transmitter is improved, thereby improving the resolution performance of the synthetic aperture radar system and realizing the synthetic aperture radar system with high linearity. And the power amplifier change of the radar transmitter can be tracked in real time, so that the whole radar system can dynamically adapt to the external environment, temperature and performance change caused by power amplifier aging, and high linearity is always kept.
Drawings
FIG. 1 is a schematic block diagram of a linearization arrangement for a synthetic aperture radar transmitter in accordance with the invention;
fig. 2 is a circuit configuration diagram of a linearization apparatus of a synthetic aperture radar transmitter in the present invention;
FIG. 3 is a block diagram of the digital predistorter of the present invention;
fig. 4 is a block diagram of the update process of the predistortion parameters of the one-dimensional lookup table in the present invention.
Detailed Description
A preferred embodiment of the present invention will be described in detail below with reference to fig. 1 to 4.
Fig. 1 is a schematic block diagram of a linearization apparatus of a synthetic aperture radar transmitter according to the present invention. The linearization device is characterized in that a digital predistorter is arranged between a digital signal generator and a power amplifier to perform pre-disturbance on an input signal, so that a pre-distorted signal processed by the digital predistorter has a characteristic curve opposite to the nonlinear characteristic of the power amplifier, and the pre-distorted signal is subjected to nonlinear amplification by the power amplifier to obtain an output signal linearly amplified with the input signal.
As shown in fig. 2, the linearizing apparatus of the synthetic aperture radar transmitter provided by the present invention is electrically connected to a power amplifier 5 of the synthetic aperture radar transmitter, and specifically includes a digital signal generator 1, a digital predistorter 2, a signal conversion module 3, a frequency conversion module 4, and a feedback module 6, which are electrically connected. In this embodiment, the power amplifier 5 of the synthetic aperture radar transmitter adopts a power amplifier of the type tga2517 of the triquant company.
Wherein the digital signal generator 1 generates a digital intermediate frequency broadband radar signal as an input signal for the whole linearizing apparatus.
The digital predistorter 2 is connected with the output end of the digital signal generator 1, and performs predistortion processing on the digital intermediate frequency broadband radar signal according to set predistortion parameters, the digital predistorter 2 is a nonlinear device, and the set predistortion parameters have inverse characteristics with the power amplifier 5 and are used for compensating and offsetting the nonlinear distortion of the power amplifier 5.
In this embodiment, the digital signal generator 1 and the digital predistorter 2 are integrated together and implemented by an FPGA (Field Programmable gate Array), and the FPGA can be implemented by using an EP2S90F1020 model.
The digital predistorter 2 comprises a replication predistorter 21 and a training predistorter 22 which have the same structure. A one-dimensional lookup table 23 is arranged in the training predistorter 22, and different predistortion parameters are arranged in the one-dimensional lookup table 23 corresponding to each table address x. In this embodiment, the table length of the one-dimensional lookup table 23 is 1024, that is, the table address x =1, 2, … …, 1024.
The signal conversion module 3 includes a digital-to-analog (D/a) converter 31 (e.g., implemented by a model of Ti DAC 5682Z) and an analog-to-digital (a/D) converter 32 (e.g., implemented by a model of Ti ADS61B 49).
The D/a converter 31 is connected to the output end of the replica predistorter 21, and performs digital-to-analog conversion on the digital intermediate frequency broadband radar signal subjected to the predistortion processing to form and output an analog intermediate frequency broadband radar signal.
The frequency conversion module 4 (for example, implemented by HMC220MS 8) is connected between the output of the D/a converter 31 and the input of the power amplifier 5, and is composed of a mixer and a first filter (not shown); the frequency mixer of the frequency conversion module 4 converts the received analog intermediate frequency broadband radar signal into a radio frequency signal, and the radio frequency signal is filtered by the first filter and then transmitted to the power amplifier 5.
The power amplifier 5 amplifies the received radio frequency signal and transmits the amplified radio frequency signal to the outside through an antenna. Since the input signal has been subjected to the inverse nonlinear processing by the digital predistorter 2 with respect to the power amplifier 5, after the nonlinear amplification by the power amplifier 5, the radio frequency signal finally transmitted through the antenna is linearly amplified (as shown in fig. 1) compared with the input signal generated by the digital signal generator 1.
The feedback module 6 is connected with the output end of the power amplifier 5 and consists of a coupler, a down converter and a second filter (not shown in the figure); and a coupler of the feedback module 6 receives the feedback radio frequency signal output by the power amplifier 5, performs coupling attenuation on the feedback radio frequency signal, forms a feedback intermediate frequency signal through a down converter, and finally outputs the feedback intermediate frequency signal after being filtered by a second filter.
The a/D converter 32 is connected between the output end of the feedback module 6 and the feedback input end of the digital predistorter 2, receives the feedback intermediate frequency signal output by the feedback module 6, performs analog-to-digital conversion on the feedback intermediate frequency signal, and transmits the feedback intermediate frequency signal to the feedback input end of the digital predistorter 2.
As shown in fig. 3 and 4, the digital predistorter 2 is configured to generate a feedback digital intermediate frequency signal according to the output of the power amplifier 5
And the digital intermediate frequency broadband radar signal after the predistortion processing
And comparing, obtaining real-time predistortion parameters of the digital predistorter 2 through a predistortion adaptive algorithm, and updating the parameters of the digital predistorter 2.
The linearization method of the synthetic aperture radar transmitter according to the invention is described in detail below. Firstly based on the input signal of the training predistorter 22, i.e. the feedback digital intermediate frequency signal outputted by the power amplifier 5
The predistortion parameters in the one-dimensional lookup table 23 are updated. Based on the input signal of the training predistorter 22
Amplitude value of
And obtains the corresponding predistortion parameters in the one-dimensional lookup table 23. If the amplitude value of the input signal
Mapping at a table address
And
point in between
Upper, and point
Closer to
Then can be provided withIs the table address to be updated, the corresponding table entry value
Is the predistortion parameter to be updated. According to the current one-dimensional look-up table 23
、
Corresponding table entry value
、
The input signal can be obtained by linear interpolationCorresponding pre-disturbance component：
According to the pre-disturbance component
And calculating an output signal of the pre-distortion processing of the training pre-distorter (22):
。
as shown in fig. 3, based on the pre-disturbance component
The real-time predistortion parameter update value of the current training predistorter 22 is obtained by an adaptive LMS (least mean square error) algorithm, and the specific steps are as follows:
；
wherein,
the iteration step is a non-negative constant and influences the convergence rate and stability of the adaptive LMS algorithm (generally 0 <, in the case of the adaptive LMS algorithm)＜1）；
Is an input signal for training the predistorter 22, i.e. a feedback digital intermediate frequency signal output by the power amplifier 5;
a desired response signal output by the replica predistorter 21, that is, a digital intermediate frequency broadband radar signal subjected to predistortion processing by the replica predistorter 21;is an output signal pre-distorted by the training pre-distorter 22;
then is
And
the error value of (1);
for training the coefficient of the lookup table of the predistorter, namely the table entry value corresponding to the address of the one-dimensional lookup table obtained by the amplitude calculation of the input signal
；
I.e. the updated value of the real-time predistortion parameters of the currently trained predistorter.
After completing an adaptive updating process in the training predistorter 22, copying the obtained real-time predistortion parameters of the current training predistorter 22 and the updated one-dimensional look-up table 23 to the replica predistorter 21, and copying the input signal of the replica predistorter
Pre-distortion processing is carried out to obtain
(ii) a And then again based on the feedback signal
The predistortion parameter update of the one-dimensional lookup table 23 is performed on the training predistorter 22, and the real-time predistortion parameters of the current training predistorter 22 are obtained.
By analogy, the adaptive algorithm of training, updating and copying is repeatedly performed until the outputs of the copy predistorter 21 and the training predistorter 22 are approximately the same, that is, the outputs are approximately the same
=
At this time, the error
=0, then the inputs of the copy predistorter 21 and the training predistorter 22 will also be identical, i.e. there is
Thereby realizing a linearization process of the output of the power amplifier 5.
The linearization device and method of the synthetic aperture radar transmitter can realize the nonlinear correction of synthetic aperture radar transmitting signals, so that the distortion of the radar transmitting signals is smaller, and the linearity of the power amplifier of the radar transmitter is improved, thereby improving the resolution performance of the synthetic aperture radar system and realizing the synthetic aperture radar system with high linearity. And the power amplifier change of the radar transmitter can be tracked in real time, so that the whole radar system can dynamically adapt to the external environment, temperature and performance change caused by power amplifier aging, and high linearity is always kept.
In addition, because the digital predistorter and the digital signal generator are integrated together and are realized by the FPGA, the parameter updating of the digital predistorter is carried out at the interval time of the digital signal generator transmitting the digital pulse, thereby effectively reducing the requirement on the processing speed of the FPGA.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A linearization device of a synthetic aperture radar transmitter is connected with a power amplifier (5) of the synthetic aperture radar transmitter through a circuit, and is characterized by comprising a digital signal generator (1), a digital predistorter (2), a signal conversion module (3), a frequency conversion module (4) and a feedback module (6) which are connected through the circuit;
the digital signal generator (1) generates a digital intermediate frequency broadband radar signal;
the digital predistorter (2) is connected with the output end of the digital signal generator (1) and is used for carrying out predistortion treatment on the digital intermediate frequency broadband radar signal according to the set predistortion parameters; and comparing the real-time predistortion parameters with the received feedback digital intermediate frequency signal output by the power amplifier (5), obtaining the real-time predistortion parameters of the digital predistorter (2) through a predistortion adaptive algorithm, and updating the parameters of the digital predistorter (2).
2. The linearization apparatus of a synthetic aperture radar transmitter according to claim 1, wherein the digital predistorter (2) comprises a replica predistorter (21) and a training predistorter (22) having the same structure.
3. The synthetic aperture radar transmitter linearizing apparatus as claimed in claim 2, wherein said training predistorter (22) is configured with a one-dimensional look-up table (23); the one-dimensional lookup table (23) is provided with predistortion parameters corresponding to each table address.
4. The linearization apparatus of a synthetic aperture radar transmitter of claim 2, wherein the signal conversion module (3) comprises a digital-to-analog converter (31) and an analog-to-digital converter (32);
the digital-to-analog converter (31) is connected with the output end of the copy predistorter (21) and is used for performing digital-to-analog conversion on the digital intermediate frequency broadband radar signals subjected to predistortion processing to form and output analog intermediate frequency broadband radar signals.
5. Linearization arrangement for a synthetic aperture radar transmitter according to claim 4, characterized in that the frequency conversion block (4) is connected between the output of the digital-to-analog converter (31) and the input of the power amplifier (5) and is composed of a mixer and a first filter;
and a mixer of the frequency conversion module (4) converts the received analog intermediate frequency broadband radar signal into a radio frequency signal, and the radio frequency signal is filtered by a first filter and then transmitted to a power amplifier (5).
6. Linearization arrangement for a synthetic aperture radar transmitter according to claim 5, characterized in that the feedback block (6) is connected to the output of the power amplifier (5) and is composed of a coupler, a down converter and a second filter;
and a coupler of the feedback module (6) receives the feedback radio frequency signal output by the power amplifier (5), performs coupling attenuation on the feedback radio frequency signal, forms a feedback intermediate frequency signal through a down converter, and finally outputs the feedback intermediate frequency signal after being filtered by a second filter.
7. The linearization apparatus of a synthetic aperture radar transmitter according to claim 6, wherein the analog-to-digital converter (32) is connected between the output of the feedback module (6) and the feedback input of the digital predistorter (2), and receives the feedback intermediate frequency signal output by the feedback module (6), and performs analog-to-digital conversion to the feedback digital intermediate frequency signal, and then transmits the feedback intermediate frequency signal to the feedback input of the digital predistorter (2).
8. A method of linearizing a synthetic aperture radar transmitter, comprising the steps of:
step 1, the copy predistorter (21) inputs signals to the copy predistorter according to predistortion parameters
I.e. the digital intermediate frequency broadband radar signal is obtained by pre-distortion treatment
；
Step 2, the training predistorter (22) receives the feedback digital intermediate frequency signal output by the power amplifier (5)
According to its magnitude value
Acquiring a corresponding predistortion parameter in a one-dimensional lookup table (23);
step 3, the training predistorter (22) obtains real-time predistortion parameter update of the current training predistorter (22) through a self-adaptive LMS algorithm;
step 4, the training predistorter (22) completes one-time self-adaptive updating, and the obtained real-time predistortion parameters of the current training predistorter (22) and the updated one-dimensional lookup table (23) are copied to the copying predistorter (21);
and 5, repeating the steps 1 to 4 until the outputs of the replication predistorter (21) and the training predistorter (22) are the same, namely the inputs of the replication predistorter (21) and the training predistorter (22) are also the same, thereby realizing the linearization process of the output of the power amplifier (5).
9. The method of linearizing a synthetic aperture radar transmitter in accordance with claim 8, wherein step 2 comprises the steps of:
training predistorter (22) based on feedback digital intermediate frequency signal output by power amplifier (5)
Amplitude value ofTo obtain the table address mapped in the one-dimensional lookup table (23)
And
point in between
Upper, and point
Closer to
(ii) a Wherein X =1, 2, … …, X; x represents the table length of the one-dimensional lookup table (23);
according to the current one-dimensional look-up table (23)、
Corresponding table entry value
、
The input signal can be obtained by linear interpolationCorresponding pre-disturbance component
：
；
According to the pre-disturbance component
And calculating an output signal of the pre-distortion processing of the training pre-distorter (22):
。
10. the method of linearizing a synthetic aperture radar transmitter in accordance with claim 8, wherein step 3 comprises the steps of:
；
wherein,
is an iteration step size and is a non-negative constant;
the input signal of the pre-distorter (22) is trained, namely the feedback digital intermediate frequency signal output by the power amplifier (5);for reproducing the output of the predistorter (21)The expected response signal, namely the digital intermediate frequency broadband radar signal subjected to the predistortion processing of the replica predistorter (21);
is an output signal which is subjected to predistortion processing by a training predistorter (22);
then is
And
the error value of (1);
for training the coefficient of the lookup table of the predistorter, namely the table entry value corresponding to the address of the one-dimensional lookup table obtained by the amplitude calculation of the input signal
；I.e. the updated values of the real-time predistortion parameters of the currently trained predistorter (22).
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| CN103454618A (en) * | 2013-09-07 | 2013-12-18 | 西安电子科技大学 | System and method for transmitting terahertz radar signal based on digital pre-distortion |
| CN103616672A (en) * | 2013-12-02 | 2014-03-05 | 中国电子科技集团公司第二十九研究所 | Broadband radar space target characteristic signal simulator |
| CN104678379A (en) * | 2014-12-26 | 2015-06-03 | 中国科学院声学研究所 | Signal processing method and signal processing device |
| CN103809159B (en) * | 2012-11-07 | 2017-05-24 | 现代摩比斯株式会社 | Apparatus and method for signal linearizing of radar system |
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| CN103809159B (en) * | 2012-11-07 | 2017-05-24 | 现代摩比斯株式会社 | Apparatus and method for signal linearizing of radar system |
| CN103454618A (en) * | 2013-09-07 | 2013-12-18 | 西安电子科技大学 | System and method for transmitting terahertz radar signal based on digital pre-distortion |
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| CN103616672A (en) * | 2013-12-02 | 2014-03-05 | 中国电子科技集团公司第二十九研究所 | Broadband radar space target characteristic signal simulator |
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| CN104678379A (en) * | 2014-12-26 | 2015-06-03 | 中国科学院声学研究所 | Signal processing method and signal processing device |
| CN107332574A (en) * | 2017-08-11 | 2017-11-07 | 北京北广科技股份有限公司 | A kind of high-power Loran-C pulse emitter and its waveform modulated method |
| CN109150213A (en) * | 2018-09-26 | 2019-01-04 | 西安烽火电子科技有限责任公司 | A kind of digital pre-distortion system |
| CN109150213B (en) * | 2018-09-26 | 2020-11-10 | 西安烽火电子科技有限责任公司 | Digital predistortion system |
| CN111366903A (en) * | 2020-04-03 | 2020-07-03 | 河南华兴通信技术有限公司 | Radar channel transmission calibration system |
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Application publication date: 20120502 |