CN111600602A - Phase discriminator and radar system using same - Google Patents
Phase discriminator and radar system using same Download PDFInfo
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- CN111600602A CN111600602A CN202010537660.9A CN202010537660A CN111600602A CN 111600602 A CN111600602 A CN 111600602A CN 202010537660 A CN202010537660 A CN 202010537660A CN 111600602 A CN111600602 A CN 111600602A
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- 238000005070 sampling Methods 0.000 claims abstract description 27
- 238000004148 unit process Methods 0.000 claims abstract description 9
- 239000013307 optical fiber Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 5
- 230000000644 propagated effect Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 241001111948 Spilotes Species 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 101100150295 Mus musculus Scarf1 gene Proteins 0.000 description 3
- 101100433169 Rattus norvegicus Zdhhc2 gene Proteins 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/091—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector using a sampling device
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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
- G01S7/35—Details of non-pulse systems
-
- 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
- G01S7/35—Details of non-pulse systems
- G01S7/352—Receivers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/089—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention provides a phase discriminator and a radar system using the same, wherein the phase discriminator comprises a pilot signal, a receiving signal, a sampling unit, an exclusive-OR gate unit and an accumulator, the sampling unit samples the pilot signal and the receiving signal, the exclusive-OR gate unit processes the sampled data and then outputs a binary code stream, and the binary code stream is further processed by the accumulator to obtain the phase difference between the pilot signal and the receiving signal. The phase discriminator and the radar system thereof have simple hardware structure, do not need to use an ADC (analog-to-digital converter), reduce the design and popularization cost, improve the dynamic range of a radar receiver and improve the competitiveness of products.
Description
Technical Field
The invention belongs to the field of radar application, and particularly relates to a dynamic positioning method for a radar.
Background
In the civil and military fields, radar systems are often required to be used for positioning, and the current positioning schemes of radar systems mainly include design schemes such as FMCW (Frequency Modulated Continuous Wave), dot Frequency radar, OFDM radar and the like.
US patent application US10436890, filed 5/6 on 2015, discloses a FMCW-based positioning method, which adopts a time division multiplexing method of MIMO radar, utilizes the rule that the received echo frequency and the transmitted frequency change are both triangular waves, adopts two-dimensional fourier transform, and utilizes a small time difference to calculate a target distance.
US patent No. US10557933 filed on 3, 9.2017 discloses a radar positioning method, which mainly uses a doppler correction phase rotation control unit to determine a doppler correction phase rotation amount for correcting a doppler frequency component based on a moving speed of a moving object, thereby realizing positioning of a moving target such as a vehicle.
The system design of the two schemes is complex, the popularization and application cost is high, the popularization and application range is limited, and the dynamic receiving range of the radar is limited.
Therefore, there is a need to develop a new radar positioning implementation method, which simplifies the system design, reduces the complexity and cost, and improves the dynamic receiving range of the radar.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a method for realizing a frequency conversion positioning radar based on a single-bit comparator.
In a first aspect, the present invention provides a phase discriminator, which includes a pilot signal, a received signal, a sampling unit, an xor gate unit and an accumulator, wherein the sampling unit samples the pilot signal and the received signal, the xor gate unit processes the sampled data and outputs a binary code stream, and the binary code stream is further processed by the accumulator to obtain a phase difference between the pilot signal and the received signal.
Furthermore, the frequency of the pilot signal and the frequency of the received signal are adjustable.
Furthermore, the exclusive-or gate unit converts the analog signal into a logic code stream by using a 1-bit comparator, and then identifies the phase.
Furthermore, the exclusive-or gate unit processes the binary code stream in series or in parallel.
Furthermore, the exclusive or gate unit can also adopt logic components.
Further, the accumulator may be any one of an integrator and a programmable logic device.
Further, the sampling unit performs single-bit sampling on the pilot signal and the received signal.
Further, the binary code stream is propagated through optical fiber or transmitted as an electrical signal, and the transceiver part and the digital processing part of the system can be distributed in different geographical locations to form a distributed system.
In a second aspect, the present invention provides a radar system, which includes a phase discriminator, a sampling unit, an xor gate unit, and an accumulator, where the sampling unit samples a pilot signal and a received signal, the xor gate unit processes the sampled data and outputs a binary code stream, and the binary code stream is further processed by the accumulator to obtain a phase difference between the pilot signal and the received signal.
Furthermore, the frequency of the pilot signal and the frequency of the received signal are adjustable.
Furthermore, the exclusive-or gate unit converts the analog signal into a logic code stream by using a 1-bit comparator, and then identifies the phase.
Furthermore, the exclusive-or gate unit processes the binary code stream in series or in parallel.
Furthermore, the exclusive or gate unit can also adopt logic components.
Further, the accumulator may be any one of an integrator and a programmable logic device.
Further, the sampling unit performs single-bit sampling on the pilot signal and the received signal.
Further, the binary code stream is propagated through optical fiber or transmitted as an electrical signal, and the transceiver part and the digital processing part of the system can be distributed in different geographical locations to form a distributed system.
Further, the radar system further comprises a transmitter and a receiver, and the transmitter and the receiver can be directly subjected to up-down frequency conversion or multi-stage up-down frequency conversion.
The phase discriminator and the radar system thereof have simple hardware structure, and do not need to use ADC (Analog-to-Digital Converter), thereby reducing the cost and improving the dynamic range of the radar receiver.
Drawings
FIG. 1: the positioning radar system of the invention forms an architecture diagram.
FIG. 2: the data sampling of the present invention is illustrated.
FIG. 3: the phase discriminator of the invention is composed of schematic diagrams.
Detailed Description
Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, and while the invention will be described in connection with the preferred embodiments, it will be understood by those skilled in the art that these embodiments are not intended to limit the invention to these embodiments, but on the contrary, the invention is intended to cover alternatives, modifications and equivalents, which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
Referring to fig. 1, the positioning radar system of the present invention is shown as an architectural diagram, and the system is composed of a frequency-variable Continuous Wave (CW) transmission source 101, a transmitter 102, a target 103, a receiver 104, and a phase detector 105 (phase detector).
The frequency-converted Continuous is generated by a pilot CW (Continuous Wave) transmission source 101 into a CW pilot signal Spilot, which is up-converted to a millimeter Wave band via a transmitter 102, e.g., 28GHz or 70GHz, and transmitted by the antenna, the transmitted waveform encounters target 103 bounce, the echo signal is received by receiver 104 and downconverted back to the CW frequency, the receiver's received signal Srec and CW pilot signal Spilot are co-frequency signals, but the phase shift is different corresponding to the delay time of the target, the system determines the distance of the target by detecting the time difference of the echo signals, in the case where the transmit-receive signal is only a sine wave of a particular frequency, the time delay is converted into a phase difference, the detection of which can be done by the phase detector 105, by adjusting the frequency of the input signal, the phase detection accuracy of the phase detector 105 can be adjusted accurately, and further used for accurately determining the target distance. The transmitter 102 and the receiver 104 in fig. 1 may be direct up-down conversion or multi-stage up-down conversion, and in the target 103 detection process, the system may use different pilot frequencies of discrete transformation for target positioning.
Referring to fig. 2, a schematic diagram of data sampling according to the present invention is shown, in which a circular black solid point is a sampling point, in the present invention, a phase detector 105 directly compares a sine wave input signal with a 0V point by using an optical fiber photoelectric converter, and then outputs a two-level optical signal of 1 and 0, where 1 represents that an input voltage is greater than 0V and 0 represents that an input voltage is less than 0V, and since the comparison is performed only at a fixed time interval, for example, using a commercial photoelectric converter with a bandwidth of 10Gbps, the comparison sampling point is set to be 100ps at a fixed interval, a 1GHz sine wave is ten-fold over-sampled and converted into a binary sequence of 1111100000, and when a phase error or a time delay is less than 100ps, the binary sequence is indiscrimina.
In the system, the phase detector 105 samples and converts the receiving signals Srec and CW pilot signals Spilot with the same frequency into two groups of binary code streams at the same clock rate, and the binary code streams are used for distinguishing and identifying the tiny phase difference.
For example, when the input waveform and the sampling time are integer multiples, a 1G signal is sampled by 10G, then 5 continuous balanced binary code streams of 1 and 5 continuous 0 are fixed, when the input signal is 0.99G, the same 10G signal is also sampled, nine 1111100000 and 1111110000 unbalanced code streams appear in each 1000 binary code streams, and the position of the single unbalanced code 1111110000 pattern in the whole code stream is analyzed, so that detailed phase information can be given.
In the system, the frequency of a variable frequency Continuous pilot frequency CW (Continuous Wave) emission source and the sampling frequency are set to be non-integral multiples, a periodically-occurring unbalanced binary code stream is introduced, and a secondary code stream generated by a transmitting signal and a receiving signal is compared, so that the phase difference between the transmitting signal and the receiving signal can be further identified, and the purpose of radar positioning is realized.
Referring to fig. 3, a schematic diagram of a phase discriminator according to the present invention is shown, where a received signal Srec and a CW pilot signal Spilot are common-frequency signals, the two signals are subjected to single-bit sampling, and are converted into two binary code streams at fs sampling rate of a sampling unit 301, the binary code streams may be transmitted to an xor gate unit 302 for operation through optical fiber transmission or electric signals, and during optical fiber transmission, a transceiver portion and a digital processing portion of a system may be distributed at different geographical locations to form a distributed system. The xor gate unit 302 can process input code streams in series or in parallel, different bits of the code streams cause 1 output, the same bit causes 0 output, the xor gate unit 302 converts analog signals into logic code streams by using a 1-bit comparator, phases are identified accordingly, the output of the xor gate unit 302 enters the accumulator 303, the results of the xor gate unit 302 are accumulated within a certain time, the result value of the accumulator 303 corresponds to the phase difference of two input signals, the accumulator 303 can be replaced by any one of an integrator or a programmable logic device, and the output of the accumulator 303 is further used by other circuits.
The xor gate unit 302 may also be replaced by a combination of logic components and/or logic components that can achieve the same kind of functions, and is not limited to an xor gate.
Claims (17)
1. A phase discriminator comprises a pilot signal, a receiving signal and a sampling unit, and is characterized by further comprising an exclusive-OR gate unit and an accumulator, wherein the sampling unit samples the pilot signal and the receiving signal, the exclusive-OR gate unit processes the sampled data and outputs a binary code stream, and the binary code stream is further processed by the accumulator to obtain the phase difference between the pilot signal and the receiving signal.
2. A phase detector as claimed in claim 1, characterized in that the frequency of the pilot signal and the received signal is adjustable.
3. A phase detector as claimed in claim 1, characterized in that said xor gate unit uses a 1-bit comparator to convert the analog signal into a logical code stream and thereby to discriminate the phase.
4. A phase detector as claimed in claim 1, characterized in that said xor gate unit processes the binary code stream in series or in parallel.
5. A phase detector as claimed in claim 1, characterized in that said xor gate unit may also employ logic components.
6. A phase detector as claimed in claim 1, wherein said accumulator is either an integrator or a programmable logic device.
7. A phase detector as claimed in claim 1, characterized in that the sampling unit performs single-bit sampling of the pilot signal and the received signal.
8. A phase detector as claimed in claim 1, characterized in that said binary code stream is propagated through optical fibers or electrical signals, while the transceiver part and the digital processing part of the system are distributed in different geographical locations forming a distributed system.
9. The radar system comprises a phase discriminator and is characterized by further comprising a sampling unit, an exclusive-OR gate unit and an accumulator, wherein the sampling unit samples a pilot signal and a received signal, the exclusive-OR gate unit processes the sampled data and then outputs a binary code stream, and the binary code stream is further processed by the accumulator to obtain the phase difference between the pilot signal and the received signal.
10. The radar system of claim 9 wherein the pilot signal and the received signal are frequency tunable.
11. The radar system of claim 9 wherein the xor gate unit uses a 1-bit comparator to convert analog signals into a stream of logic bits and thereby discriminate phase.
12. The radar system of claim 9 wherein the xor gate unit processes the binary code stream serially or in parallel.
13. The radar system of claim 9 wherein said exclusive or gate unit further comprises logic components.
14. The radar system of claim 9 wherein said accumulator is any one of an integrator and a programmable logic device.
15. The radar system of claim 9 wherein the sampling unit performs single bit sampling of the pilot signal and the received signal.
16. The radar system of claim 9 wherein the binary code stream is propagated through optical fibers or electrical signals, and wherein the transceiver portion and the digital processing portion of the system are distributed in different geographical locations to form a distributed system as the optical fibers propagate.
17. The radar system of claim 9 further comprising a transmitter and a receiver, wherein the transmitter and receiver are either direct up-down conversion or multi-stage up-down conversion.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010537660.9A CN111600602A (en) | 2020-06-12 | 2020-06-12 | Phase discriminator and radar system using same |
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| CN202010537660.9A CN111600602A (en) | 2020-06-12 | 2020-06-12 | Phase discriminator and radar system using same |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4598293A (en) * | 1981-11-12 | 1986-07-01 | International Standard Electric Corporation | Radar or sonar detection system |
| US6271786B1 (en) * | 1999-06-07 | 2001-08-07 | Raytheon Company | Random noise radar target detection device |
| JP2003329764A (en) * | 2002-05-08 | 2003-11-19 | Mitsubishi Electric Corp | Pulse radar system |
| JP2009244136A (en) * | 2008-03-31 | 2009-10-22 | Mitsubishi Electric Corp | Radar system |
| US20140023120A1 (en) * | 2011-10-07 | 2014-01-23 | Panasonic Corporation | Signal processing apparatus, radar apparatus, and signal processing method |
| CN103744082A (en) * | 2014-01-22 | 2014-04-23 | 南京信息工程大学 | Digital multimedia broadcasting (DMB) signal-based passive radar vapor detection method |
| US20180172816A1 (en) * | 2016-12-20 | 2018-06-21 | National Chung-Shan Institute Of Science & Technology | Signal processing apparatus of a continuous-wave (cw) radar sensing system |
| CN212210973U (en) * | 2020-06-12 | 2020-12-22 | 盛纬伦(深圳)通信技术有限公司 | Phase discriminator and radar system using same |
| US20210072382A1 (en) * | 2018-01-31 | 2021-03-11 | Robert Bosch Gmbh | Lidar Time-of-Flight and Intensity Detection Signal-Path Based on Phase-Coded Multi-Pulse Transmission and Single-Bit Oversampled Matched Filter Detection |
-
2020
- 2020-06-12 CN CN202010537660.9A patent/CN111600602A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4598293A (en) * | 1981-11-12 | 1986-07-01 | International Standard Electric Corporation | Radar or sonar detection system |
| US6271786B1 (en) * | 1999-06-07 | 2001-08-07 | Raytheon Company | Random noise radar target detection device |
| JP2003329764A (en) * | 2002-05-08 | 2003-11-19 | Mitsubishi Electric Corp | Pulse radar system |
| JP2009244136A (en) * | 2008-03-31 | 2009-10-22 | Mitsubishi Electric Corp | Radar system |
| US20140023120A1 (en) * | 2011-10-07 | 2014-01-23 | Panasonic Corporation | Signal processing apparatus, radar apparatus, and signal processing method |
| CN103744082A (en) * | 2014-01-22 | 2014-04-23 | 南京信息工程大学 | Digital multimedia broadcasting (DMB) signal-based passive radar vapor detection method |
| US20180172816A1 (en) * | 2016-12-20 | 2018-06-21 | National Chung-Shan Institute Of Science & Technology | Signal processing apparatus of a continuous-wave (cw) radar sensing system |
| US20210072382A1 (en) * | 2018-01-31 | 2021-03-11 | Robert Bosch Gmbh | Lidar Time-of-Flight and Intensity Detection Signal-Path Based on Phase-Coded Multi-Pulse Transmission and Single-Bit Oversampled Matched Filter Detection |
| CN212210973U (en) * | 2020-06-12 | 2020-12-22 | 盛纬伦(深圳)通信技术有限公司 | Phase discriminator and radar system using same |
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