CN112763987B - Secondary radar full-dynamic receiving system based on dynamic range splitting - Google Patents
Secondary radar full-dynamic receiving system based on dynamic range splitting Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
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- Radar, Positioning & Navigation (AREA)
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- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a secondary radar full-dynamic receiving system based on dynamic range splitting, which comprises two ADC modules, a frequency mixing module, a signal selecting module and an amplitude correcting module, wherein the two ADC modules are used for sampling signals of a first radio frequency channel and a second radio frequency channel to obtain a first sampling signal and a second sampling signal, and sending the first sampling signal and the second sampling signal to the frequency mixing module; the frequency mixing module is used for respectively obtaining a first baseband IQ signal and a second baseband IQ signal; the signal selection module is used for detecting the amplitude of the first baseband IQ signal and the second baseband IQ signal, selecting the first baseband IQ signal to output when the amplitude of the first baseband IQ signal is larger than or equal to a first threshold amplitude and the amplitude of the second baseband IQ signal is smaller than a second threshold amplitude, and selecting the second baseband IQ signal to output when the amplitude of the second baseband IQ signal is larger than or equal to the second threshold amplitude. The invention can realize real-time full-dynamic receiving and recover signal phase without distortion.
Description
Technical Field
The invention relates to the technical field of secondary radars, in particular to a secondary radar full-dynamic receiving system based on dynamic range splitting.
Background
The minimum signal receiving power of the receiver of the traditional secondary radar is-85 dBm, and the dynamic range of the receiver is-15 dBm to-85 dBm as the receiving power span of the receiver is 70 dB. The receiving power range of the traditional ADC device is +1dBm to-50 dBm, the receiving power span is about 50dB, and dynamic receiving is not satisfied.
Currently, secondary radars mainly achieve full dynamic reception through AGC (automatic gain control) or intermediate frequency logarithmic amplifiers. However, AGC performs positive feedback control according to the received signal strength, and under the action of AGC, a radar receives signals of a close range target and a far range target in a time-sharing manner, so that the signals of the far range target are lost when the signals of the close range target are received. The intermediate frequency logarithmic amplifier has the defects of high cost, signal phase damage and the like.
Disclosure of Invention
The invention aims to provide a secondary radar full-dynamic receiving system based on dynamic range splitting, which can realize real-time full-dynamic receiving and recover signal phases without distortion.
In order to solve the technical problems, the invention adopts a technical scheme that: the utility model provides a full dynamic receiving system of secondary radar based on dynamic range split, including first ADC module, second ADC module, frequency mixing module, signal selection module and amplitude correction module, first ADC module passes through the antenna of first radio frequency channel connection secondary radar, second ADC module passes through the antenna of second radio frequency channel connection secondary radar, the gain of first radio frequency channel is first numerical value, the gain of second radio frequency channel is the second numerical value, the receiving power range of first ADC module is between the lower limit value and the third numerical value of receiver dynamic range, the receiving power range of second ADC module is between the upper limit value of third numerical value and receiver dynamic range, first numerical value is greater than the second numerical value, the third numerical value is the negative number, and the absolute value of third numerical value is 1 less than first numerical value;
the first ADC module is used for sampling the signal of the first radio frequency channel to obtain a first sampling signal and sending the first sampling signal to the mixing module; the second ADC module is used for sampling the signal of the second radio frequency channel to obtain a second sampling signal and sending the second sampling signal to the mixing module;
the frequency mixing module is used for performing down-conversion and AM demodulation processing on the first sampling signal and the second sampling signal to respectively obtain a first baseband IQ signal and a second baseband IQ signal, and sending the first baseband IQ signal and the second baseband IQ signal to the signal selecting module;
the signal selection module is used for detecting whether the amplitude of the first baseband IQ signal is larger than a first threshold amplitude and whether the amplitude of the second baseband IQ signal is larger than a second threshold amplitude, selecting the first baseband IQ signal to output to the amplitude correction module when the amplitude of the first baseband IQ signal is larger than or equal to the first threshold amplitude and the amplitude of the second baseband IQ signal is smaller than the second threshold amplitude, and selecting the second baseband IQ signal to output to the amplitude correction module when the amplitude of the second baseband IQ signal is larger than or equal to the second threshold amplitude;
the amplitude correction module is used for multiplying a preset correction coefficient by the first baseband IQ signal and outputting the multiplied value, or multiplying a preset correction coefficient, a correction multiple and the second baseband IQ signal and outputting the multiplied value, wherein the correction multiple is the amplitude corresponding to the difference value between the first numerical value and the second numerical value.
Preferably, the signal selection module is further configured to select the first baseband IQ signal to output to the amplitude modification module when the amplitude of the first baseband IQ signal is greater than or equal to a first threshold amplitude and the amplitude of the second baseband IQ signal is greater than or equal to a second threshold amplitude.
Preferably, the system further comprises a first FIFO buffer module, a second FIFO buffer module and a delay control module;
the first ADC module is used for sending a first sampling signal to the first FIFO buffer module; the second ADC module is used for sending a second sampling signal to the second FIFO buffer module;
the first FIFO buffer module is used for delaying the first sampling signal by a first number of clocks and sending the delayed first sampling signal to the mixing module;
the second FIFO buffer module is used for delaying a second sampling signal by a second number of clocks and sending the delayed second sampling signal to the mixing module;
the frequency mixing module is used for sending the first baseband IQ signal and the second baseband IQ signal to the delay control module;
the delay control module is used for comparing rising edges of the first baseband IQ signal and the second baseband IQ signal, calculating relative delay difference, calculating first quantity and second quantity according to the system clock and the relative delay difference when the relative delay difference is not 0 so as to respectively control the first FIFO buffer module and the second FIFO buffer module to delay, and transmitting the first baseband IQ signal and the second baseband IQ signal to the signal selection module when the relative delay difference is 0.
Preferably, the dynamic range of the receiver is-85 dBm to-15 dBm.
Preferably, the first value is 46, the second value is 10, and the third value is-45.
Preferably, the first threshold amplitude is an amplitude corresponding to-39 dBm, and the second threshold amplitude is an amplitude corresponding to-35 dBm.
Unlike the prior art, the invention has the beneficial effects that:
1. the method completely overcomes the defect that the adoption of AGC can receive signals of a close range target and a far range target in a time sharing way, and can simultaneously receive signals of the far range target and the close range target;
2. compared with the mode of adopting an intermediate frequency logarithmic amplifier, the full-dynamic receiving can be realized at lower cost, the signal phase can be recovered without distortion, and the problem of damaging the signal phase does not exist.
Drawings
Fig. 1 is a schematic block diagram of a secondary radar full-dynamic receiving system based on dynamic range splitting according to an embodiment of the present invention.
Fig. 2 is a schematic block diagram of a secondary radar full-dynamic receiving system based on dynamic range splitting according to another embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the full-dynamic receiving system of the secondary radar based on dynamic range splitting according to the embodiment of the invention includes a first ADC module 1, a second ADC module 2, a mixing module 3, a signal selecting module 4 and an amplitude modifying module 5, where the first ADC module 1 is connected to an antenna of the secondary radar through a first radio frequency channel, the second ADC module 2 is connected to the antenna of the secondary radar through a second radio frequency channel, a gain of the first radio frequency channel is a first value, a gain of the second radio frequency channel is a second value, a receiving power range of the first ADC module 1 is between a lower limit value and a third value of the dynamic range of the receiver, the receiving power range of the second ADC module 2 is between the third value and an upper limit value of the dynamic range of the receiver, the first value is greater than the second value, the third value is a negative number, and an absolute value of the third value is smaller than the first value by 1.
The first ADC module 1 is configured to sample a signal of the first radio frequency channel to obtain a first sampling signal, and send the first sampling signal to the mixing module 3; the second ADC module 2 is configured to sample a signal of the second radio frequency channel to obtain a second sampled signal, and send the second sampled signal to the mixing module 3. The signal received by the antenna of the secondary radar is divided into two paths which respectively enter the first radio frequency channel and the second radio frequency channel, and as the gain of the first radio frequency channel is larger, a large signal can be formed, and the gain of the second radio frequency channel is smaller, a small signal can be formed. The large and small signals of the two radio frequency channels are respectively sent to the first ADC module 1 and the second ADC module 2 for sampling. It should be noted that the sizes herein are the first rf channel and the second rf channel in comparison with each other.
The mixing module 3 is configured to perform down-conversion and AM demodulation on the first sampling signal and the second sampling signal, obtain a first baseband IQ signal and a second baseband IQ signal, and send the first baseband IQ signal and the second baseband IQ signal to the signal selecting module 4. The AM demodulation process performed by the mixing module 3 is to square and sum the down-converted baseband IQ.
The signal selection module 4 is configured to detect whether the amplitude of the first baseband IQ signal is greater than a first threshold amplitude and whether the amplitude of the second baseband IQ signal is greater than a second threshold amplitude, select the first baseband IQ signal to output to the amplitude correction module 5 when the amplitude of the first baseband IQ signal is greater than or equal to the first threshold amplitude and the amplitude of the second baseband IQ signal is less than the second threshold amplitude, and select the second baseband IQ signal to output to the amplitude correction module 5 when the amplitude of the second baseband IQ signal is greater than or equal to the second threshold amplitude.
In one practical application, the dynamic range of the receiver is-85 dBm to-15 dBm, the first value is 46, the second value is 10, the third value is-45, the first threshold amplitude is the amplitude corresponding to-39 dBm, and the second threshold amplitude is the amplitude corresponding to-35 dBm. That is, the gain of the first radio frequency channel is 46dB, the gain of the second radio frequency channel is 10dB, the receiving power range of the first ADC module 1 is (-85 to-45) dBm, and the receiving power range of the second ADC module 2 is (-45 to-15) dBm.
If the amplitude of the first baseband IQ signal is greater than or equal to the first threshold amplitude and the amplitude of the second baseband IQ signal is smaller than the second threshold amplitude, which means that the dynamic range of the receiver is (-85 to-45) dBm, the amplitude of the first baseband IQ signal is suitable at this time, and the amplitude of the second baseband IQ signal is too small to meet the sensitivity requirement, so the signal selection module 3 selects the first baseband IQ signal to output.
If the amplitude of the second baseband IQ signal is greater than or equal to the second threshold amplitude, which indicates that the dynamic range of the receiver is (-45 to-15) dBm, the amplitude of the first baseband IQ signal is too large and overflows in saturation, and the amplitude of the second baseband IQ signal is suitable, so that the signal selection module 3 selects the output of the second baseband IQ signal.
The amplitude correction module 5 is configured to multiply the first baseband IQ signal by a preset correction coefficient and output the first baseband IQ signal, or multiply the second baseband IQ signal by a preset correction coefficient and a correction multiple, where the correction multiple is an amplitude corresponding to a difference between the first value and the second value. The difference between the first value and the second value is 36dB, and the correction factor is the amplitude corresponding to 36 dB.
The preset correction coefficient is a preset fixed value, and can be flexibly set according to the data transmission bit width of the secondary radar. When the dynamic range of the receiver is (-85 to-45) dBm, the amplitude correction module 4 outputs a first baseband IQ value multiplied by a preset correction coefficient. When the dynamic range of the receiver is (-45 to-15) dBm, the amplitude correction module 4 outputs a second baseband IQ value multiplied by a preset correction coefficient multiplied by 63.1 because the gains of the first radio frequency channel and the second radio frequency channel differ by 36dB and the amplitude corresponding to 36dB is 63.1.
In this embodiment, the signal selection module 3 is further configured to select the first baseband IQ signal to output to the amplitude correction module 4 when the amplitude of the first baseband IQ signal is greater than or equal to the first threshold amplitude and the amplitude of the second baseband IQ signal is greater than or equal to the second threshold amplitude.
Wherein the receiving power ranges of the first ADC module 1 and the second ADC module 2 do not overlap, that is, the receiving power range intervals thereof do not include the third value, and if the dynamic range of the receiver is just at-45 dBm, the amplitude of the first baseband IQ signal is 1dBm, which is greater than-39 dBm, and the amplitude of the second baseband IQ signal is-35 dBm, which is equal to-35 dBm, but the larger the signal amplitude is, the better the signal-to-noise ratio is, so the signal selection module 3 still selects the first baseband IQ signal to output.
Referring to fig. 2, a schematic block diagram of a secondary radar full-dynamic receiving system based on dynamic range splitting according to another embodiment of the present invention is provided, which has the same technical features as the foregoing embodiment, and is different in that the secondary radar full-dynamic receiving system of the present embodiment further includes a first FIFO buffer module 6, a second FIFO buffer module 7, and a delay control module 8.
The first ADC module 1 is configured to send a first sampling signal to the first FIFO buffer module 5; the second ADC module 2 is configured to send a second sampling signal to the second FIFO buffer module 6;
the first FIFO buffer module 6 is configured to delay the first sampling signal by a first number of clocks, and send the delayed first sampling signal to the mixing module 3;
the second FIFO buffer module 7 is configured to delay the second sampling signal by a second number of clocks, and send the delayed second sampling signal to the mixing module 3;
the frequency mixing module 3 is configured to send the first baseband IQ signal and the second baseband IQ signal to the delay control module 8;
the delay control module 8 is configured to compare rising edges of the first baseband IQ signal and the second baseband IQ signal, calculate a relative delay difference, calculate a first number and a second number according to the system clock and the relative delay difference when the relative delay difference is not 0, so as to control the first FIFO buffer module 6 and the second FIFO buffer module 7 to delay respectively, and send the first baseband IQ signal and the second baseband IQ signal to the signal selection module 4 when the relative delay difference is 0.
By means of the mode, the secondary radar full-dynamic receiving system based on dynamic range splitting in the embodiment of the invention divides the dynamic range of a receiver into two sections, the two sections are respectively used as the receiving power ranges of the two ADC sampling modules, and the signal amplitudes sampled by the two ADC modules are compared to select one for output, so that real-time full-dynamic receiving can be realized, and the signal phase can be recovered without distortion.
The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application, and various modifications and variations may be suggested to one skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (6)
1. The secondary radar full-dynamic receiving system based on dynamic range splitting is characterized by comprising a first ADC module, a second ADC module, a frequency mixing module, a signal selection module and an amplitude correction module, wherein the first ADC module is connected with an antenna of a secondary radar through a first radio frequency channel, the second ADC module is connected with the antenna of the secondary radar through a second radio frequency channel, the gain of the first radio frequency channel is a first value, the gain of the second radio frequency channel is a second value, the receiving power range of the first ADC module is between the lower limit value of the dynamic range of a receiver and a third value, the receiving power range of the second ADC module is between the third value and the upper limit value of the dynamic range of the receiver, the first value is larger than the second value, the third value is a negative number, and the absolute value of the third value is smaller than the first value by 1;
the first ADC module is used for sampling the signal of the first radio frequency channel to obtain a first sampling signal and sending the first sampling signal to the mixing module; the second ADC module is used for sampling the signal of the second radio frequency channel to obtain a second sampling signal and sending the second sampling signal to the mixing module;
the frequency mixing module is used for performing down-conversion and AM demodulation processing on the first sampling signal and the second sampling signal to respectively obtain a first baseband IQ signal and a second baseband IQ signal, and sending the first baseband IQ signal and the second baseband IQ signal to the signal selecting module;
the signal selection module is used for detecting whether the amplitude of the first baseband IQ signal is larger than a first threshold amplitude and whether the amplitude of the second baseband IQ signal is larger than a second threshold amplitude, selecting the first baseband IQ signal to output to the amplitude correction module when the amplitude of the first baseband IQ signal is larger than or equal to the first threshold amplitude and the amplitude of the second baseband IQ signal is smaller than the second threshold amplitude, and selecting the second baseband IQ signal to output to the amplitude correction module when the amplitude of the second baseband IQ signal is larger than or equal to the second threshold amplitude;
the amplitude correction module is used for multiplying a preset correction coefficient by the first baseband IQ signal and outputting the multiplied value, or multiplying a preset correction coefficient, a correction multiple and the second baseband IQ signal and outputting the multiplied value, wherein the correction multiple is the amplitude corresponding to the difference value between the first numerical value and the second numerical value.
2. The full-dynamic secondary radar receiving system according to claim 1, wherein the signal selecting module is further configured to select the first baseband IQ signal to output to the amplitude modifying module when the amplitude of the first baseband IQ signal is greater than or equal to a first threshold amplitude and the amplitude of the second baseband IQ signal is greater than or equal to a second threshold amplitude.
3. The secondary radar full-dynamic receiving system based on dynamic range splitting according to claim 1 or 2, further comprising a first FIFO buffer module, a second FIFO buffer module and a delay control module;
the first ADC module is used for sending a first sampling signal to the first FIFO buffer module; the second ADC module is used for sending a second sampling signal to the second FIFO buffer module;
the first FIFO buffer module is used for delaying the first sampling signal by a first number of clocks and sending the delayed first sampling signal to the mixing module;
the second FIFO buffer module is used for delaying a second sampling signal by a second number of clocks and sending the delayed second sampling signal to the mixing module;
the frequency mixing module is used for sending the first baseband IQ signal and the second baseband IQ signal to the delay control module;
the delay control module is used for comparing rising edges of the first baseband IQ signal and the second baseband IQ signal, calculating relative delay difference, calculating first quantity and second quantity according to the system clock and the relative delay difference when the relative delay difference is not 0 so as to respectively control the first FIFO buffer module and the second FIFO buffer module to delay, and transmitting the first baseband IQ signal and the second baseband IQ signal to the signal selection module when the relative delay difference is 0.
4. The full-dynamic receiving system of the secondary radar based on dynamic range splitting according to claim 3, wherein the dynamic range of the receiver is-85 dBm to-15 dBm.
5. The dynamic range splitting based secondary radar fully dynamic receiving system as claimed in claim 4, wherein said first value is 46, said second value is 10, and said third value is-45.
6. The dynamic range splitting-based secondary radar full-dynamic receiving system according to claim 5, wherein the first threshold amplitude is an amplitude corresponding to-39 dBm and the second threshold amplitude is an amplitude corresponding to-35 dBm.
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| CN101957444A (en) * | 2010-09-30 | 2011-01-26 | 中国船舶重工集团公司第七二三研究所 | Multichannel radar amplitude and phase automatic correcting method and device |
| CN109451573A (en) * | 2018-12-25 | 2019-03-08 | 京信通信系统（中国）有限公司 | Gain distributes self-adjusting AGC control method, apparatus and system |
| CN109952513A (en) * | 2017-09-04 | 2019-06-28 | 华为技术有限公司 | A kind of method and school survey device of the survey of phased array school |
| CN110208755A (en) * | 2019-06-13 | 2019-09-06 | 成都汇蓉国科微系统技术有限公司 | A kind of dynamic radar echo digital down conversion system and method based on FPGA |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957444A (en) * | 2010-09-30 | 2011-01-26 | 中国船舶重工集团公司第七二三研究所 | Multichannel radar amplitude and phase automatic correcting method and device |
| CN109952513A (en) * | 2017-09-04 | 2019-06-28 | 华为技术有限公司 | A kind of method and school survey device of the survey of phased array school |
| CN109451573A (en) * | 2018-12-25 | 2019-03-08 | 京信通信系统（中国）有限公司 | Gain distributes self-adjusting AGC control method, apparatus and system |
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