CN104467927B - It is a kind of to be used to compensate the method and device for receiving channel phase - Google Patents
It is a kind of to be used to compensate the method and device for receiving channel phase Download PDFInfo
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Abstract
It is used to compensate the method and device for receiving channel phase the invention discloses a kind of.This method includes：It is determined that receiving phase information of the digital intermediate frequency detection signal on channel in synchronization, the proper phase for calculating non-referenced channel and reference channel is poor；The digital medium-frequency signal received to non-referenced channel is handled, and obtains the quadrature component and in-phase component of signal to be calibrated in non-referenced channel；Phase compensation operation is carried out to the signal to be calibrated in non-referenced channel according to the proper phase difference, obtains the non-referenced channel output signal Jing Guo phase compensation；First delay process is carried out to the digital intermediate frequency channel that reference channel receives, obtains the synchronization output signal to be alignd with the sequential of the output signal of non-referenced channel.The present invention is poor using the hardware phase between each receiving channel of automatic measurement in the case of less external equipment, so as to reduce the test environment and workload of phase difference measurement between receiving channel.
Description
Technical Field
The present invention relates to the field of radio communications technologies, and in particular, to a method and an apparatus for compensating a phase of a receiving channel.
Background
In the field of radio communications, monopulse radar technology and phased array radar technology are used in a large number of applications. In the processing process, accurate phase information of each path of received signals needs to be obtained. In fact, the situation that the circuits and the connection lengths of the receivers are not consistent exists, and even under the situation that the circuits and the connections are completely the same, the problem that the phases of signals received by the receivers are not consistent is caused by slight differences of parameters among devices of the same type.
In the prior art, manual phase measurement or external equipment auxiliary automatic measurement is generally adopted to measure the phase difference between receiving channels, and an analog phase shifter is adopted to carry out phase calibration. The processing mode of manual measurement or auxiliary automatic measurement of the phase difference between the receiving channels by external equipment requires more equipment, the test environment is complex, the workload is large, an analog phase shifter needs to be designed in a circuit, and the circuit is complex, low in precision and low in reliability.
Disclosure of Invention
The invention aims to overcome the defects of huge circuit and large workload caused by the fact that the measurement of inherent phase difference between channels is finished by external instrument equipment and the phase compensation is realized by a phase shifter in the prior art.
In view of the above technical problem, the present invention provides a method for compensating a phase of a receiving channel, comprising the steps of:
determining the phase information of the digital intermediate frequency detection signal on the receiving channel at the same moment, and calculating the inherent phase difference between the non-reference channel and the reference channel;
processing the digital intermediate frequency signal received by the non-reference channel to obtain an orthogonal component and an in-phase component of a signal to be calibrated in the non-reference channel;
performing phase compensation operation on a signal to be calibrated in a non-reference channel according to the inherent phase difference to obtain a non-reference channel output signal subjected to phase compensation;
and carrying out first time delay processing on the digital intermediate frequency signal received by the reference channel to obtain a synchronous output signal aligned with the time sequence of the output signal of the non-reference channel.
In one embodiment, the step of determining the phase information of the digital intermediate frequency detection signal on the receiving channel at the same time includes:
inputting radio frequency analog detection signals with same frequency and phase to a receiving channel;
the receiving channel carries out frequency conversion processing on the radio frequency analog detection signal and outputs an analog intermediate frequency detection signal;
carrying out digital sampling on the analog intermediate frequency detection signal by using a synchronous sampling clock to obtain a digital intermediate frequency detection signal;
the in-phase component and the orthogonal component in the digital intermediate frequency detection signal of the receiving channel are distinguished, and the phase information of the digital intermediate frequency detection signal of the receiving channel at the same moment is calculated.
In one embodiment, in the step of processing the digital intermediate frequency signal received by the non-reference channel:
carrying out second time delay processing on the digital intermediate frequency signal received by the non-reference channel to obtain an in-phase component of a signal to be calibrated in the non-reference channel;
and taking the digital intermediate frequency signal received by the non-reference channel as the orthogonal component of the signal to be calibrated.
In one embodiment, the performing the phase compensation operation includes the steps of:
respectively calculating compensation coefficients of a quadrature component and an in-phase component of a signal to be compensated based on the inherent phase difference;
respectively calculating compensation values of the orthogonal component and the in-phase component of the signal to be compensated according to the compensation coefficients;
and summing the compensation values of the orthogonal component and the in-phase component of the signal to be compensated.
In one embodiment, the first delay process is delayed by two clock cycles to offset a delay caused by performing a phase compensation operation on a signal to be calibrated in a non-reference channel, and the second delay process is delayed by one clock cycle.
According to an aspect of the present invention, there is provided an apparatus for compensating for a phase of a reception channel, comprising:
the phase difference detection unit is used for determining the phase information of the digital intermediate frequency detection signals on the receiving channel at the same moment and calculating the inherent phase difference between the non-reference channel and the reference channel;
a storage unit connected to the phase difference detection unit, for storing the inherent phase difference;
the phase compensation unit is connected with the storage unit and comprises a non-reference channel processing module, a phase compensation processing module and a reference channel processing module; wherein,
the non-reference channel processing module is used for processing the digital intermediate frequency signal received by the non-reference channel to obtain the orthogonal component and the in-phase component of the signal to be calibrated in the non-reference channel,
the phase compensation processing module is used for carrying out phase compensation operation on the signal to be calibrated in the non-reference channel according to the inherent phase difference to obtain a non-reference channel output signal subjected to phase compensation,
the reference channel processing module is used for carrying out first time delay processing on the digital intermediate frequency channel received by the reference channel to obtain a synchronous output signal aligned with the time sequence of the output signal of the non-reference channel.
In one embodiment, the phase compensation unit further comprises a pre-processing unit respectively connected to the phase difference detection unit and the phase compensation unit;
the preprocessing module unit comprises a plurality of AD sampling modules and is used for receiving analog intermediate frequency signals from a receiving channel, and the AD sampling modules use synchronous sampling clocks to sample the analog intermediate frequency signals to obtain digital intermediate frequency signals.
In one embodiment, the phase difference detection unit includes a discrimination module, a phase calculation module, and a phase difference calculation module, wherein,
the distinguishing module is used for distinguishing an in-phase component and a quadrature component in a digital intermediate frequency detection signal of a receiving channel,
the phase calculation module is used for calculating the phase information of the digital intermediate frequency detection signal of the receiving channel at the same moment according to the in-phase component and the quadrature component,
and the phase difference calculating module is used for calculating the inherent phase difference between the non-reference channel and the reference channel according to the phase information.
In one embodiment, the phase compensation processing module comprises a compensation coefficient calculation sub-module, a compensation value calculation sub-module and a summation processing sub-module, wherein
The compensation coefficient calculation submodule is used for respectively calculating the compensation coefficients of the orthogonal component and the in-phase component of the signal to be compensated based on the inherent phase difference;
the compensation value calculation submodule is used for respectively calculating the compensation values of the orthogonal component and the in-phase component of the signal to be compensated according to the compensation coefficient;
and the summation processing submodule is used for summing the compensation values of the orthogonal component and the in-phase component of the signal to be compensated.
In an embodiment, the non-reference channel processing module is further configured to perform a second delay processing on the digital intermediate frequency signal received by the non-reference channel, so as to obtain an in-phase component of the signal to be calibrated in the non-reference channel.
In one embodiment, the first delay process is delayed by two clock cycles to offset a delay caused by performing a phase compensation operation on a signal to be calibrated in a non-reference channel, and the second delay process is delayed by one clock cycle.
The invention has the advantages that the hardware phase difference among the receiving channels can be automatically measured under the condition of using less external equipment, thereby reducing the testing environment and workload of the phase difference measurement among the receiving channels; and the influence phase difference among all receiving channels is compensated under the condition of not increasing phase shifters, so that the number of phase shifter circuits is reduced, the precision is higher, and the reliability is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus for compensating a phase of a receiving channel according to a first embodiment of the present invention;
fig. 2 is a flowchart of steps of a method for compensating a phase of a receiving channel according to a second embodiment of the present invention;
fig. 3 is a schematic diagram of phase difference detection according to the second embodiment of the present invention;
fig. 4 is a schematic diagram of phase compensation according to the second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.
In the existing data processing process of single pulse and phased array radar, accurate phase information of received signals needs to be obtained, and therefore the requirement of phase consistency of a plurality of receiving channels is brought. In the prior art, phase calibration measurement is generally performed by means of external instruments, and phase compensation is performed by means of phase shifters. This requires a large number of external devices to measure the phase difference between the channels and a large number of phase shifters to compensate for the phase difference between the individual receive channels. This results in a very bulky circuit for the measuring and compensating device and a low accuracy of the compensation.
The invention can automatically complete phase calibration and can realize phase compensation without using circuits such as a phase shifter and the like. The invention mainly comprises two stages of phase detection and phase calibration. In the phase detection stage, inphase radio frequency signals with specified frequency are input into each receiving channel, intermediate frequency signals are obtained through frequency conversion of the receiving channels, digital intermediate frequency signals are generated after AD sampling is carried out, and the inherent phase difference between each path of signals and reference channel signals is calculated and stored. In the phase compensation stage, the reference channel signal is delayed, and the other signals of the non-reference channel are phase-shifted, so that various paths of signals which are consistent in phase and synchronous are finally obtained.
Specifically, in the embodiment of the present invention, an analog intermediate frequency of 70MHz and a sampling clock of 40MHz are selected for AD sampling, in-phase components and quadrature components of digital signals of a receiving channel are alternately acquired, and the sampled signals are processed. This allows for automatic measurement of hardware phase differences between receive channels with less external equipment and compensation of the affected phase delays between receive channels without adding phase shifters.
The method and apparatus for compensating the phase of the receiving channel according to the present invention will be described in detail with reference to specific embodiments.
Example one
The present embodiment provides an apparatus for compensating a phase of a reception channel.
As shown in the figure1, the device comprises a preprocessing unit which receives analog intermediate frequency signals IF from a receiving channel 1 to a receiving channel n1To IFn. A plurality of AD sampling modules consistent with the number of channels are arranged in the preprocessing unit. The AD samplers use synchronous sampling clocks to alternately sample received analog intermediate frequency signals to obtain digital intermediate frequency signals.
In the phase detection stage, a certain same-frequency and same-phase analog radio frequency detection signal is input to each receiving channel, and each receiving channel performs frequency conversion processing on the analog radio frequency detection signal and outputs an analog intermediate frequency detection signal. The preprocessing unit samples the analog intermediate frequency detection signal to obtain a digital intermediate frequency detection signal.
The phase difference detection unit is connected with the preprocessing unit. The phase difference detection unit receives each path of digital intermediate frequency signal, determines phase information of the digital intermediate frequency detection signal on each path of receiving channel at the same time, and calculates the inherent phase difference between the non-reference channel and the reference channel.
As shown in fig. 1, the phase difference detection unit further includes a distinguishing module, a phase calculation module, and a phase difference calculation module. The distinguishing module is used for solving the In-phase component In and the orthogonal component Q of the digital intermediate frequency detection signal of each receiving channeln。
In this embodiment, the AD sampler and the differentiating module are used In combination to extract the In-phase component In and the quadrature component Q of the digital intermediate frequency detection signaln. For example, the nth AD sampler receives the digital intermediate frequency signal IFnAnd sampling, wherein the distinguishing module performs alternate processing on the sampling result by taking one clock cycle as a time unit. As an example, the distinguishing module takes the sampled signal in the first clock cycle as the digital intermediate frequency signal IFnQuadrature component Q ofnTaking the sampled signal in the second clock cycle as a digital intermediate frequency signal IFnIn is the same phase component of (a).
The phase calculation module is used for calculating the In-phase component In and the quadrature component Q according to the phasenCalculating each received channelPhase information theta of digital intermediate frequency detection signals of tracks at the same moment1To thetan. Preferably, the phase is solved using CORDIC (Coordinate rotation digital Computer) algorithm, and the phase information may be solved by other algorithms such as table lookup, or by DSP, ARM, etc. processor.
The phase difference calculation module is used for calculating phase difference according to the phase information theta1To thetanThe inherent phase difference of the non-reference channel and the reference channel is calculated. In this embodiment, the 1 st channel is selected as the reference channel, and the 2 nd to nth channels are selected as the non-reference channels. The phase difference calculation module calculates the phase difference phi between the 2 nd path signal and the 1 st path signal2＝θ2-θ1I.e., the inherent phase difference in hardware between channel 2 and channel 1. Similarly, the phase difference Φ between the n-th signal and the 1-th signal is calculatedn＝θn-θ1I.e., the inherent phase difference in hardware between the nth channel and the 1 st channel. Preferably, in order to ensure the accuracy of the calculation, the average value may be calculated multiple times as the final result.
For a wideband receiver, when receiving radio frequency signals of different frequencies, the inherent phase difference of the receiver varies with the change of the frequency. The inherent phase difference obtained by the phase difference calculation module is the inherent phase difference corresponding to each frequency point.
The apparatus of the present embodiment further comprises a storage unit, connected to the phase difference detection unit, for storing the inherent phase difference Φ between the non-reference channel and the reference channel2To phin. Not limited thereto, the memory cell may also store sin ΦnAnd cos ΦnThese parameters, which are related to the intrinsic phase difference, are used in the subsequent phase compensation process. In practical application, the information stored in the storage unit includes the frequency of each frequency point and the corresponding phase difference.
It should be noted that, as the system operation time increases, the working performance of each receiver in the radar data processing process tends to deteriorate gradually, and the value of the inherent phase difference detected by the phase difference detection unit is not constant. Therefore, in the embodiment, the phase difference detection unit and the storage unit are used in cooperation, so that the change of the inherent phase difference can be timely monitored in different operation stages for the same receiving system, and an accurate result is provided for a subsequent phase compensation stage.
It is easy to understand that the phase difference detection unit and the storage unit are used in cooperation, and a flexible detection mode can be provided for different receiver systems, so that a wider application range is provided for the embodiment.
As shown in fig. 1 again, the apparatus of this embodiment further includes a phase compensation unit, which is connected to the storage unit and the preprocessing unit, and is configured to perform phase compensation operations such as phase shifting and delaying on the signal to be calibrated actually received in each channel according to the inherent phase difference, so as to obtain a digital intermediate frequency signal unrelated to the hardware phase delay of the receiving channel.
In the phase compensation stage, each receiving channel receives actual common-frequency radio frequency signals, and each receiving channel performs frequency conversion processing on the radio frequency signals and outputs analog intermediate-frequency signals. In the preprocessing unit, a plurality of AD sampling modules with synchronous sampling clocks are used for respectively and alternately sampling each path of analog intermediate frequency signals to obtain actually received digital intermediate frequency signals, and then the signals are input into the phase compensation unit.
Because the inherent phase delay of each path of receiving channel hardware is different, the phase information in the actually received digital intermediate frequency signal output by the preprocessing unit is different, and the phase compensation unit can perform accurate phase compensation operation according to the inherent phase difference value in the storage unit.
Specifically, the phase compensation unit includes a non-reference channel processing module, a phase compensation processing module, and a reference channel processing module. In this embodiment, the 1 st channel is selected as the reference channel, and the 2 nd to nth channels are selected as the non-reference channels.
The non-reference channel processing module is used for processing the digital intermediate frequency signal received by the non-reference channel to obtain an orthogonal component and an in-phase component of a signal to be calibrated in the non-reference channel.
And the phase compensation processing module is connected with the non-reference channel processing module and is used for carrying out phase compensation operation on the signal to be calibrated in the non-reference channel according to the inherent phase difference to obtain a non-reference channel output signal subjected to phase compensation.
The reference channel processing module is used for carrying out first time delay processing on the digital intermediate frequency channel received by the reference channel to obtain a synchronous output signal aligned with the time sequence of the output signal of the non-reference channel.
It should be noted that, the AD sampler in the preprocessing module and the reference channel processing module are used cooperatively to obtain the in-phase component I of the signal to be calibrated in the non-reference signaln' sum quadrature component Qn'. For example, the nth AD sampler receives the digital intermediate frequency signal IFnAnd sampling, wherein the non-reference channel processing module performs alternate processing on the sampling result by taking one clock period as a time unit. In one example, the non-reference channel processing module takes the sampled signal in the first clock cycle as the digital intermediate frequency signal IF to be calibratednQuadrature component Q ofn' taking the sampled signal in the second clock cycle as the digital intermediate frequency signal IF to be calibratednIn' of the two-phase signal. That is to say, the non-reference channel processing module performs the second delay processing on each path of digital intermediate frequency signal to obtain the in-phase component I of the signal to be calibrated in the non-reference channeln' and using each digital IF signal as the quadrature component Q of the signal to be calibratedn' and outputting the signal to a phase compensation processing module. Preferably, the second delay process is a delay of one clock cycle.
As shown in fig. 1, the phase compensation processing module includes a compensation coefficient calculation sub-module, a compensation value calculation sub-module, and a summation processing sub-module. Wherein the compensation coefficient calculation submodule is used for calculating the inherent phase difference information phi based on the memory unitnRespectively calculating the compensation coefficient sin phi of the orthogonal component of each path of signal to be compensatednAnd is in phase withCompensation coefficient of component cos Φn. In practical applications, the sin Φ may be generated using DDSnAnd cos ΦnAlternatively, sin Φ can be obtained by other algorithms, e.g., table lookupnAnd cos ΦnOr by means of a processor such as a DSP or ARM. Alternatively, as described above, if the memory cell stores sin ΦnAnd cos ΦnThese parameters related to the inherent phase difference, the compensation coefficient calculation sub-module can directly read sin phinAnd cos ΦnThe value of (A) is used as the compensation coefficient of the orthogonal component and the in-phase component of each path of signal to be compensated.
And the compensation value calculation submodule is used for respectively calculating the compensation values of the orthogonal component and the in-phase component of the signal to be compensated according to the compensation coefficient. For the nth signal to be compensated, the compensation value of the orthogonal component is sin phinAnd Qn' multiplication product, compensation value of in-phase component is cos phinAnd In' product of multiplication.
The summation processing submodule is used for carrying out summation processing on the compensation values of the orthogonal component and the in-phase component of the signal to be compensated and outputting the nth path signal SIN phi completing phase compensationnQn’+COSφnIn'. In this way, the 2 nd output signal OUT2 to the nth output signal OUTn have the same amplitude and frequency as the digital intermediate frequency signal input by the phase compensation unit, and the precise compensation is completed according to the phase difference caused by each receiving channel hardware.
In this embodiment, since the 1 st channel is the reference channel, the reference channel processing module does not need to perform phase compensation on the 1 st signal, and only needs to perform the first delay processing on the 1 st signal to compensate for the time required by the phase compensation on other non-reference channels, so as to obtain the synchronous output signal OUT1 which is aligned with the timing sequence of other channels and has no phase change. Preferably, the first delay process is delayed by two clock cycles.
In this way, the phases of the output signals OUT1 through OUTN are consistent and are synchronized in terms of timing, regardless of the hardware phase delay in each of the receiving channels.
In practical applications, if the value of the intrinsic phase difference detected by the phase difference detection unit changes, the phase compensation unit may automatically perform adaptive adjustment so that the operation of phase compensation matches the change of the intrinsic phase difference, thereby completing phase compensation with high accuracy.
Moreover, for different receiver systems, the phase compensation unit can provide a flexible compensation mode, so that a wider application range is provided for the embodiment.
Therefore, the device provided by the embodiment can automatically measure the hardware phase difference among the receiving channels under the condition of using less external equipment, thereby reducing the testing environment and workload of phase difference measurement among the receiving channels; and the influence phase difference among all receiving channels is compensated under the condition of not increasing phase shifters, so that the number of phase shifter circuits is reduced, the precision is higher, and the reliability is improved.
Example two
The present embodiment provides a method for compensating the phase of a receiving channel, and fig. 2 is a flowchart illustrating the steps of the method.
As shown in fig. 2, in the phase detection stage, the phase information of the digital intermediate frequency detection signals on each receiving channel at the same time is determined, and the inherent phase difference between the non-reference channel and the reference channel is calculated (step S210). Then, in the phase compensation stage, the digital intermediate frequency signal received by the non-reference channel is processed to obtain the orthogonal component and the in-phase component of the signal to be calibrated in the non-reference channel (step S220), and then, the signal to be calibrated in the non-reference channel is subjected to the phase compensation operation according to the inherent phase difference to obtain the phase-compensated output signal of the non-reference channel (step S230). Finally, the first delay processing is performed on the digital intermediate frequency channel received by the reference channel to obtain a synchronous output signal aligned with the timing of the output signal of the non-reference channel (step S240).
Fig. 3 and 4 are schematic diagrams of the phase detection phase and the phase compensation phase, respectively.
Specifically, as shown in fig. 3, in step S210, the same-frequency and same-phase RF analog detection signals RF are input to each receiving channel, and the receiving channel performs frequency conversion processing on the RF analog detection signals RF and outputs analog intermediate frequency detection signals IF1 to IFn. And carrying out digital sampling on each path of analog intermediate frequency detection signal by using a synchronous sampling clock to obtain a digital intermediate frequency detection signal. Next, In-phase component In and quadrature component Q In the digital intermediate frequency detection signal of each receiving channel are distinguishednThen, the inherent phase difference of the non-reference channel and the reference channel is calculated.
In particular, the extraction of the In-phase component In and the quadrature component Q of the digital intermediate frequency detection signal by the cooperative use of AD sampling and discrimination operationsn. For example, the nth AD sampler receives the digital intermediate frequency signal IFnAnd sampling, and performing alternate processing on the sampling result by taking one clock cycle as a time unit to realize distinguishing operation. As an example, the sampling signal in the first clock cycle is taken as the digital intermediate frequency signal IFnQuadrature component Q ofnTaking the sampled signal in the second clock cycle as a digital intermediate frequency signal IFnIn is the same phase component of (a).
In the example of fig. 3, the 1 st channel is selected as the reference channel, the 2 nd to nth channels are selected as the non-reference channels, and the CORDIC algorithm is used to calculate the phase information θ of the digital intermediate frequency detection signals of each receiving channel at the same time1To thetanThen calculating the phase difference phi between the 2 nd path signal and the 1 st path signal2＝θ2-θ1I.e., the inherent phase difference in hardware between channel 2 and channel 1. Similarly, the phase difference Φ between the n-th signal and the 1-th signal is calculatedn＝θn-θ1I.e., the inherent phase difference in hardware between the nth channel and the 1 st channel.
In this way, the inherent phase difference between the hardware of the reference channel and the hardware of the non-reference channel can be obtained and stored in step S210. As described above, the inherent phase difference corresponds to each frequency bin. When the operating frequency of the channel changes, the inherent phase difference changes.
A specific flow during the phase compensation phase is shown in fig. 4. In step S220, each receiving channel receives the actual RF signal RF with the same frequency, and each receiving channel performs frequency conversion on the RF signal to output analog IF1 'to IFn'. Then, carrying out second time delay processing on the digital intermediate frequency signal received by the non-reference channel to obtain an in-phase component I of the signal to be calibrated in the channels from 2 nd channel to n th channeln' and using each digital IF signal as the quadrature component Q of the signal to be calibratedn'. Preferably, the second delay process is a delay of one clock cycle.
It should be noted that, In this step, the In-phase component In' and the quadrature component Q of the signal to be calibrated are extracted by the cooperation of the AD sampling and the second delay processingn'. Similar to step S210, the sampling result is processed alternately in a unit of time of one clock cycle to extract the in-phase component and the quadrature component of the signal to be calibrated.
Next, in step S230, based on the inherent phase difference Φ that has been stored2To phinRespectively calculating orthogonal components Q of signals to be compensatedn' and in-phase component In' of the equation. In the example of FIG. 4, sin Φ is generated using DDSnAnd cos ΦnObtaining the compensation coefficient sin phi of the orthogonal component of each path of signal to be compensatednCompensation coefficient cos Φ of in-phase componentn. Then, respectively calculating compensation values of the orthogonal component and the in-phase component of the signal to be compensated according to the compensation coefficients, summing the compensation values of the orthogonal component and the in-phase component of the signal to be compensated, and outputting the nth signal OUTN (sin phi) with completed phase compensationnQn’+cosφnIn’。
In the example of fig. 4, since the 1 st channel is the reference channel, it is not necessary to perform phase compensation on the 1 st signal in step S240, and only the 1 st signal needs to be subjected to the first delay processing to compensate for the time required for performing phase compensation on other non-reference channels, and the synchronization signal OUT1 with timing aligned with other channels and without phase change is output. Preferably, the first delay process is delayed by two clock cycles.
In this way, the phases of the output signals OUT1 through OUTN are consistent and are synchronized in terms of timing, regardless of the hardware phase delay in each of the receiving channels.
The method provided by the embodiment can automatically detect the phase difference caused by hardware of each receiving channel and perform phase compensation on each path of received signals. In the embodiment, when the phase compensation operation is performed, the first path of signal is delayed, the other paths of signals are shifted in phase, and the signals with consistent and synchronous phases are obtained through reasonable matching of delay and phase shift.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. A method for compensating for the phase of a receive channel, comprising the steps of:
calculating the inherent phase difference of the non-reference channel and the reference channel for multiple times to obtain the average value of the inherent phase difference of the non-reference channel and the reference channel; wherein the calculating the inherent phase difference of the non-reference channel and the reference channel comprises: inputting radio frequency analog detection signals with same frequency and phase to a receiving channel; the receiving channel carries out frequency conversion processing on the radio frequency analog detection signal and outputs an analog intermediate frequency detection signal; carrying out digital sampling on the analog intermediate frequency detection signal by using a synchronous sampling clock to obtain a digital intermediate frequency detection signal; determining the phase information of the digital intermediate frequency detection signals on the receiving channel at the same moment, and calculating the inherent phase difference between the non-reference channel and the reference channel according to the phase information of the digital intermediate frequency detection signals on the receiving channel at the same moment;
processing the digital intermediate frequency signal received by the non-reference channel to obtain an orthogonal component and an in-phase component of a signal to be calibrated in the non-reference channel;
performing phase compensation operation on a signal to be calibrated in a non-reference channel according to the inherent phase difference average value to obtain a non-reference channel output signal subjected to phase compensation;
and carrying out first time delay processing on the digital intermediate frequency signal received by the reference channel to obtain a synchronous output signal aligned with the time sequence of the output signal of the non-reference channel.
2. The method of claim 1, wherein the step of determining the phase information of the digital intermediate frequency detection signal on the receiving channel at the same time comprises:
the in-phase component and the orthogonal component in the digital intermediate frequency detection signal of the receiving channel are distinguished, and the phase information of the digital intermediate frequency detection signal of the receiving channel at the same moment is calculated.
3. The method of claim 2, wherein in the step of processing the digital intermediate frequency signal received by the non-reference channel:
carrying out second time delay processing on the digital intermediate frequency signal received by the non-reference channel to obtain an in-phase component of a signal to be calibrated in the non-reference channel;
and taking the digital intermediate frequency signal received by the non-reference channel as the orthogonal component of the signal to be calibrated.
4. The method of claim 3, wherein said performing phase compensation operations comprises the steps of:
respectively calculating compensation coefficients of a quadrature component and an in-phase component of a signal to be compensated based on the inherent phase difference average value;
respectively calculating compensation values of the orthogonal component and the in-phase component of the signal to be compensated according to the compensation coefficients;
and summing the compensation values of the orthogonal component and the in-phase component of the signal to be compensated.
5. The method of claim 3 or 4, wherein the first delay process is a delay of two clock cycles to offset a delay caused by performing a phase compensation operation on the signal to be calibrated in the non-reference channel, and the second delay process is a delay of one clock cycle.
6. An apparatus for compensating for a phase of a receive channel, comprising:
a phase difference detection unit for determining phase information of the digital intermediate frequency detection signal on the receiving channel at the same time, and calculating the inherent phase difference between the non-reference channel and the reference channel according to the phase information of the digital intermediate frequency detection signal on the receiving channel at the same time; calculating the inherent phase difference of the non-reference channel and the reference channel for multiple times to obtain the average value of the inherent phase difference of the non-reference channel and the reference channel; wherein the digital intermediate frequency detection signal on the receiving channel is obtained by: inputting radio frequency analog detection signals with same frequency and phase to a receiving channel; the receiving channel carries out frequency conversion processing on the radio frequency analog detection signal and outputs an analog intermediate frequency detection signal; carrying out digital sampling on the analog intermediate frequency detection signal by using a synchronous sampling clock to obtain a digital intermediate frequency detection signal;
a storage unit connected to the phase difference detection unit, for storing the average value of the inherent phase difference;
the phase compensation unit is connected with the storage unit and comprises a non-reference channel processing module, a phase compensation processing module and a reference channel processing module; wherein,
the non-reference channel processing module is used for processing the digital intermediate frequency signal received by the non-reference channel to obtain the orthogonal component and the in-phase component of the signal to be calibrated in the non-reference channel,
the phase compensation processing module is used for carrying out phase compensation operation on a signal to be calibrated in a non-reference channel according to the inherent phase difference average value to obtain a non-reference channel output signal subjected to phase compensation,
the reference channel processing module is used for carrying out first time delay processing on the digital intermediate frequency channel received by the reference channel to obtain a synchronous output signal aligned with the time sequence of the output signal of the non-reference channel.
7. The apparatus of claim 6, further comprising a pre-processing unit respectively connected to the phase difference detection unit and the phase compensation unit;
the preprocessing unit comprises a plurality of AD sampling modules and is used for receiving analog intermediate frequency signals from a receiving channel, and the AD sampling modules use synchronous sampling clocks to sample the analog intermediate frequency signals to obtain digital intermediate frequency signals.
8. The apparatus according to claim 6 or 7, wherein the phase difference detection unit comprises a discrimination module, a phase calculation module, and a phase difference calculation module, wherein,
the distinguishing module is used for distinguishing an in-phase component and a quadrature component in a digital intermediate frequency detection signal of a receiving channel,
the phase calculation module is used for calculating the phase information of the digital intermediate frequency detection signal of the receiving channel at the same moment according to the in-phase component and the quadrature component,
and the phase difference calculating module is used for calculating the inherent phase difference between the non-reference channel and the reference channel according to the phase information.
9. The apparatus of claim 8, wherein the phase compensation processing module comprises a compensation coefficient calculation sub-module, a compensation value calculation sub-module, and a summation processing sub-module, wherein
The compensation coefficient calculation submodule is used for respectively calculating the compensation coefficients of the orthogonal component and the in-phase component of the signal to be compensated based on the inherent phase difference average value;
the compensation value calculation submodule is used for respectively calculating the compensation values of the orthogonal component and the in-phase component of the signal to be compensated according to the compensation coefficient;
and the summation processing submodule is used for summing the compensation values of the orthogonal component and the in-phase component of the signal to be compensated.
10. The apparatus of claim 9, wherein the non-reference channel processing module is further configured to perform a second delay process on the digital intermediate frequency signal received by the non-reference channel to obtain an in-phase component of the signal to be calibrated in the non-reference channel.
11. The apparatus of claim 10, wherein the first delay process is a delay of two clock cycles to offset a delay caused by performing a phase compensation operation on the signal to be calibrated in the non-reference channel, and the second delay process is a delay of one clock cycle.
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