CN116781126A - Phase modulation phase-shift array receiver and method - Google Patents
Phase modulation phase-shift array receiver and method Download PDFInfo
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Abstract
The embodiment of the application discloses a phase modulation phase shift array receiver and a method thereof, wherein the receiver comprises N receiver basic units, the receiving ends of the receiver basic units are electrically connected with the output ends of low-noise amplifiers, the output ends of the receiver basic units are electrically connected with a digital beam forming module, the receiver basic units receive signals amplified by the low-noise amplifiers, and the signals are subjected to amplitude and phase splitting to obtain amplitude information and phase information. Amplitude modulation and phase modulation information of signals received by all channels in the array receiver are respectively sampled and operated, so that beam forming is realized, and the receiving information from different directions can be easily extracted during word beam forming. And the analog-to-digital sampling frequency only needs to meet the Nyquist sampling law of the baseband signal, so that the requirement of the sampling rate of the analog-to-digital converter can be greatly reduced, and the time-to-digital converter only needs to obtain the amplitude information of the signal, so that the accuracy requirement of the time-to-digital converter can be greatly reduced, and the power consumption of the whole system is reduced.
Description
Technical Field
The application relates to the technical field of phased array reception, in particular to a phase modulation phase-shift array receiver and a phase modulation phase-shift array method.
Background
The phased array works by properly shifting (or delaying) the phase of the signals of the array elements of the array arranged according to a certain rule to obtain the deflection of the antenna beam. The device has the advantages that the electric scanning of the wave beam can be realized in the space range to be observed without mechanically rotating the antenna, and the device is very convenient and flexible. At the same time, the size of the matrix can be made larger to improve the space gain. For the phased array receiving system, the signal to noise ratio of the received signal also increases along with the increase of the array element number, so that the receiving detection of weak signals can be effectively realized.
In the conventional art, the commonly used receivers include a radio frequency phase-shifting phased array receiver and a local oscillator phase-shifting phased array receiver, and as shown in fig. 1, a phase shifter in the radio frequency phase-shifting phased array receiver is located on a radio frequency link. And synthesizing the signals of all the channels after phase shifting into one channel, and completing the wave beam forming of the phased array. The signals enter a mixer, are amplified by an intermediate frequency amplifier after mixing, and are converted to a digital baseband by an analog-to-digital converter to process information in the digital baseband. The mixer is simple in structure and good in expansibility, and all modules after the mixer can be shared, so that power consumption can be greatly saved. Meanwhile, because the wave beam forming is completed at the RF end, the strong interference from the non-signal direction can be spatially filtered, and the saturation of the mixer and the intermediate frequency circuit due to the strong interference is avoided. As shown in fig. 2, each channel of the local oscillator phase-shifting phased array receiver is composed of a low-noise amplifier, a mixer and a phase shifter on a local oscillator link, intermediate frequency signals of all channels after mixing are synthesized into one channel to complete beam forming, and then amplified by an intermediate frequency amplifier and converted into a digital baseband by an analog-to-digital converter to process information in the digital baseband. The structure is simple, the expansibility is strong, the intermediate frequency and the analog-to-digital converter can be shared, and the power consumption is low. Meanwhile, as the phase shifter is in the local oscillation link, the linearity and other performances of the phase shifter have small influence on the whole system, and therefore, compared with the radio frequency phase shifting, the phase shifter is easier to realize high performance.
However, the rf phase-shifting phased array receiver is difficult to realize high linearity and low loss, and the local oscillator phase-shifting phased array receiver is easy to saturate when the mixer faces strong interference because beam forming is completed at the intermediate frequency end. Meanwhile, they cannot receive different information from different directions, and high-speed ADCs with high power consumption are required to support large data rate transmission.
Content of the application
In view of the above, the present application provides a phase modulation phase shift array receiver to solve the problems in the prior art.
In a first aspect, an embodiment of the present application provides a phase modulation phase shift array receiver, including: the system comprises N receiver basic units, wherein the receiving ends of the receiver basic units are electrically connected with the output ends of low-noise amplifiers, the output ends of the receiver basic units are electrically connected with a digital beam forming module, the receiver basic units receive signals amplified by the low-noise amplifiers, the signals are subjected to amplitude and phase splitting to obtain amplitude information and phase information, and all channels in an array receiver are used for respectively sampling and operating amplitude modulation and phase modulation information of received signals according to the amplitude information and the phase information, so that beam forming is realized.
In one possible implementation manner, the receiver basic unit includes an amplitude information acquisition branch and a phase information acquisition branch, the amplitude information acquisition branch includes an envelope detection unit and an analog-to-digital converter, and the low-noise amplified signal is subjected to detection to obtain amplitude information of the signal through the analog-to-digital converter; the phase information acquisition branch circuit comprises a waveform conversion unit and a time-to-digital converter, wherein the low-noise amplified signal is converted into a digital signal through the waveform conversion unit, and the digital signal obtains the phase information of the signal through the time-to-digital converter.
In one possible implementation, the sampling frequency of the analog-to-digital converter satisfies the nyquist sampling law of the baseband signal, and the time-to-digital converter needs to identify the phase information of each carrier, and the reference frequency of the time-to-digital converter is the carrier frequency.
In one possible implementation, a mixer is provided between the low-noise amplifier and the waveform conversion unit, and the mixer performs coherent detection on information output by the low-noise amplifier.
In one possible implementation manner, the mixer is connected to the local oscillation source, and the local oscillation source mixes the local oscillation signal and the input signal in the mixer to obtain an intermediate frequency signal with the phase and the amplitude of the input signal changing according to the same rule.
In a second aspect, an embodiment of the present application provides a method for receiving a phase modulation phase shift array, where the phase modulation phase shift array receiver according to any one of the possible implementation manners of the first aspect includes: the signals received by the antenna are respectively divided into two paths after being processed by the low-noise amplifier; one path of the signal is input into an envelope detection unit and then amplitude information of the signal is obtained through an analog-to-digital converter; the other path of the signals is input into the waveform conversion unit and then phase information of the signals is obtained through the time-to-digital converter.
In one possible implementation, the output amplitude information and phase information are input to a digital beamforming module for processing and then transmitted via digital baseband.
In the embodiment of the application, the amplitude modulation and phase modulation information of signals received by all channels in the array receiver are respectively sampled and operated to realize beam forming, and the receiving information from different directions can be easily extracted during word beam forming. And the analog-to-digital sampling frequency only needs to meet the Nyquist sampling law of the baseband signal, so that the requirement of the sampling rate of the analog-to-digital converter can be greatly reduced, and the time-to-digital converter only needs to obtain the amplitude information of the signal, so that the accuracy requirement of the time-to-digital converter can be greatly reduced, and the power consumption of the whole system is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a structure of a radio frequency phase-shifting phased array receiver;
fig. 2 is a schematic diagram of a local oscillator phase-shifting phased array receiver;
fig. 3 is a schematic structural diagram of a phase modulation phase shift array receiver according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a basic unit of a receiver according to an embodiment of the application;
fig. 5 is a schematic structural diagram of another basic unit of a receiver according to an embodiment of the present application.
Detailed Description
For a better understanding of the technical solution of the present application, the following detailed description of the embodiments of the present application refers to the accompanying drawings.
Referring to fig. 3, a phase modulation phase shift array receiver provided in an embodiment of the present application includes: the system comprises N receiver basic units, wherein the receiving ends of the receiver basic units are electrically connected with the output ends of low-noise amplifiers, the output ends of the receiver basic units are electrically connected with a digital beam forming module, the receiver basic units receive signals amplified by the low-noise amplifiers, the signals are subjected to amplitude and phase splitting to obtain amplitude information and phase information, and all channels in an array receiver are used for respectively sampling and operating amplitude modulation and phase modulation information of received signals according to the amplitude information and the phase information, so that beam forming is realized.
Referring to fig. 4, the receiver base unit in the present embodiment includes an amplitude information acquisition branch including an envelope detection unit and an analog-to-digital converter, and a phase information acquisition branch including a waveform conversion unit and a time-to-digital converter.
The signal received by the antenna is amplified by low noise and then divided into two paths, one path is used for extracting amplitude information contained in an envelope by an analog-to-digital converter ADC after envelope detection, and the other path is used for converting a sinusoidal signal into a square wave by a waveform conversion unit and then extracting phase information contained in the square wave signal by a time-to-digital converter. In this embodiment, the ADC sampling frequency only needs to satisfy the nyquist sampling law of the baseband signal. The time-to-digital converter TDC needs to identify the phase information of each carrier, so that its reference frequency is the carrier frequency.
The phase modulation phase shift array receiver can be formed by a plurality of the basic units. The phase information of each channel obtained by the time-to-digital converter comprises two parts of information, one part is phase shift information of signals received by each channel, and the relative position between the phase shift information and the receiving antenna and the signal direction is determined, and the phase shift information is known information. The other part is phase modulation information contained in each channel, and since the modulation information contained in the signal received by each channel is the same, the phase modulation information is the same among the channels. Therefore, the phase modulation information obtained by each channel can be directly extracted by using an algorithm in the digital beam forming module, and the phase modulation phase shifting function is realized. The amplitude information of each channel also contains two parts of information, one part is the phase shift of the signal received by each channel, and the phase shift is known information. The second part is the amplitude modulation information of the modulated signal received by each channel, which is consistent for each channel. Therefore, the amplitude modulation information of the received signal can be extracted by adopting the same algorithm as the phase information in the digital beam forming module. On the digital baseband, the received phase modulation information and amplitude modulation information can be restored to a complete modulation signal, so that modulation information contained in the modulation signal is demodulated.
Referring to fig. 5, a signal received by an antenna is amplified by low noise amplification and then divided into two paths, one path is subjected to envelope detection, amplitude information contained in an envelope is extracted by an ADC, the other path is subjected to coherent detection by a mixer, then a mixed product is subjected to waveform conversion, a sinusoidal signal is converted into a square wave, and phase information contained in the square wave signal is extracted by a time-to-digital converter. In this embodiment, the local oscillation signal and the input signal are mixed in the mixer to obtain an intermediate frequency signal with the same regular variation as the signal phase, thereby further reducing the sampling frequency of the TDC.
The application also provides an embodiment of a phase modulation phase shift array receiving method corresponding to the phase modulation phase shift array receiver provided by the embodiment.
In this embodiment, the phase modulation phase shift array receiver in the above embodiment is adopted, and the signal received by the antenna is divided into two paths after being processed by the low-noise amplifier; one path of the signal is input into an envelope detection unit and then amplitude information of the signal is obtained through an analog-to-digital converter; the other path of the signals is input into the waveform conversion unit and then phase information of the signals is obtained through the time-to-digital converter. The output amplitude information and phase information are input into a digital wave beam forming module for processing and then transmitted through a digital baseband.
In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relation of association objects, and indicates that there may be three kinds of relations, for example, a and/or B, and may indicate that a alone exists, a and B together, and B alone exists. Wherein A, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of the following" and the like means any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural.
The foregoing is merely exemplary embodiments of the present application, and any person skilled in the art may easily conceive of changes or substitutions within the technical scope of the present application, which should be covered by the present application. The protection scope of the present application shall be subject to the protection scope of the claims.
Claims (7)
1. A phase modulation phase shift array receiver, comprising: the system comprises N receiver basic units, wherein the receiving ends of the receiver basic units are electrically connected with the output ends of low-noise amplifiers, the output ends of the receiver basic units are electrically connected with a digital beam forming module, the receiver basic units receive signals amplified by the low-noise amplifiers, the signals are subjected to amplitude and phase splitting to obtain amplitude information and phase information, and all channels in an array receiver are used for respectively sampling and operating amplitude modulation and phase modulation information of received signals according to the amplitude information and the phase information, so that beam forming is realized.
2. The phase modulation phase shift array receiver according to claim 1, wherein the receiver base unit includes an amplitude information acquisition branch and a phase information acquisition branch, the amplitude information acquisition branch includes an envelope detection unit and an analog-to-digital converter, and the low-noise amplified signal is subjected to detection to obtain amplitude information of the signal through the analog-to-digital converter; the phase information acquisition branch circuit comprises a waveform conversion unit and a time-to-digital converter, wherein the low-noise amplified signal is converted into a digital signal through the waveform conversion unit, and the digital signal obtains the phase information of the signal through the time-to-digital converter.
3. The phase modulation phase shift array receiver of claim 2, wherein the analog-to-digital converter sampling frequency satisfies nyquist sampling law of the baseband signal, and the time-to-digital converter needs to identify phase information of each carrier, and the reference frequency of the time-to-digital converter is a carrier frequency.
4. A phase modulation phase shift array receiver as claimed in claim 2 or 3, wherein a mixer is provided between the low-noise amplifier and the waveform conversion unit, the mixer performing coherent detection of information output from the low-noise amplifier.
5. The receiver of claim 4, wherein the mixer is connected to a local oscillator, and the local oscillator mixes with the input signal in the mixer using the local oscillator signal to obtain an intermediate frequency signal having a phase and an amplitude that vary with the same rule as the input signal.
6. A phase modulation phase shift array receiving method, characterized in that the phase modulation phase shift array receiver according to any one of claims 1 to 5 is used, comprising: the signals received by the antenna are respectively divided into two paths after being processed by the low-noise amplifier; one path of the signal is input into an envelope detection unit and then amplitude information of the signal is obtained through an analog-to-digital converter; the other path of the signals is input into the waveform conversion unit and then phase information of the signals is obtained through the time-to-digital converter.
7. The method of claim 6, wherein the output amplitude information and phase information are input to a digital beamforming module for processing and transmitted via a digital baseband.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310479211.7A CN116781126A (en) | 2023-04-28 | 2023-04-28 | Phase modulation phase-shift array receiver and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310479211.7A CN116781126A (en) | 2023-04-28 | 2023-04-28 | Phase modulation phase-shift array receiver and method |
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