CN116299410A - Near-distance target simulation method for MFSK waveform radar - Google Patents

Near-distance target simulation method for MFSK waveform radar Download PDF

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CN116299410A
CN116299410A CN202211372426.0A CN202211372426A CN116299410A CN 116299410 A CN116299410 A CN 116299410A CN 202211372426 A CN202211372426 A CN 202211372426A CN 116299410 A CN116299410 A CN 116299410A
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waveform
mfsk
frequency
radar
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徐成发
江海清
左臣瑞
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Beijing Institute of Technology BIT
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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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/66—Radar-tracking systems; Analogous 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
    • G01S7/40—Means for monitoring or calibrating
    • 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
    • G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

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Abstract

The invention discloses a near-distance target simulation method for an MFSK waveform radar, which adopts the steps of obtaining a transmitting signal of the radar, adding frequency offset information into the transmitting signal to obtain an echo signal of the transmitting signal, and achieving the purpose of reducing the distance of a nearest target object which can be simulated by a radar target simulator, thereby realizing that the nearest distance of the target object which can be simulated by the radar target simulator is not limited by inherent delay of ADC and DAC devices and delay of a signal processing unit.

Description

Near-distance target simulation method for MFSK waveform radar
Technical Field
The invention belongs to the technical field of radar testing, and particularly relates to a near-field target simulation method for an MFSK waveform radar.
Background
Currently, a major technical challenge in research and development of automotive millimeter wave radar systems is the problem of simultaneous measurement of information such as distance, radial velocity and azimuth of multiple targets. The two common waveform systems are a Linear Frequency Modulation (LFM) waveform system and a Frequency Shift Keying (FSK) waveform system, wherein the conventional radar system with the LFM waveform system provides higher distance and speed resolution, but cannot solve the false target problem under the multi-target condition. In addition, the technical staff also provides a multi-frequency shift keying (MFSK) waveform system on the basis of the LFM and FSK waveform systems, the waveform system is formed by combining the LFM and FSK waveform systems, and the distance and speed resolution is very high, so that the current MFSK waveform system has been widely applied to automobile anti-collision radars and speed radars.
In the development of radar systems, a radar target simulator is an important radar test device, which performs target modulation by receiving radar signals and simulates to generate echo signals for testing in the radar research and development and production processes. In the existing radar target simulation process, as shown in fig. 2, a delay method is mainly adopted to simulate the target distance, wherein a specific implementation mode of delay includes adopting an optical fiber delay line, a Digital Radio Frequency Memory (DRFM) and the like. However, as in the radar systems of other waveform systems, there is a problem that the radar target simulator for the MFSK waveform system cannot simulate a short-range target because of the inherent delay of the system.
Disclosure of Invention
In view of the above, the present invention provides a near-field target simulation method for an MFSK waveform radar, which can simulate a near-field target of a radar system with an MFSK waveform system.
The invention provides a near-distance target simulation method for an MFSK waveform radar, which comprises the following steps:
acquiring a waveform characteristic parameter of the MFSK waveform radar and a distance value corresponding to the inherent delay of the radar target simulator, and calculating to obtain a difference frequency compensation value and a phase difference compensation value according to the waveform characteristic parameter and the distance value; finding the initial position of the MFSK waveform by adopting an MFSK waveform initial point detection method, and performing symbol matching according to the initial position to obtain phase shift output; generating a delay compensation signal according to the difference frequency compensation value, the phase difference compensation value and the phase shift output; carrying out complex multiplication on the delay compensation signal and the MFSK signal at the initial position to obtain a delay compensated signal; coarse-adjusting the distance value corresponding to the inherent delay of the system until the difference value between the simulation target distance value measured by the radar and the set simulation target distance value is within the coarse-adjusting precision range of the distance value corresponding to the inherent delay of the system; the fine tuning system delays the corresponding distance value and the phase difference calibration value until the distance between the simulation target measured by the radar and the set simulation target distance are within the range of the range error of the radar, and the speed of the simulation target measured by the radar is zero.
Further, the mode for acquiring the waveform characteristic parameters of the MFSK waveform radar is as follows: obtaining the instantaneous frequency of the MFSK signal by using a channelized frequency measurement technology, further obtaining a time-frequency diagram of the MFSK signal, and reading waveform characteristic parameters of the waveform of the MFSK signal through the time-frequency diagram, wherein the waveform characteristic parameters comprise the total bandwidth B of the waveform SW Period T of emission CPI Frequency difference f of A, B waveforms shift 。
Further, the distance value corresponding to the inherent delay of the radar target simulator is obtained by the following steps: determining a reference radar of an MFSK waveform radar class, transmitting an MFSK signal by using the reference radar, directly transmitting an echo signal after the radar target simulator receives the MFSK signal, and analyzing to obtain a distance value corresponding to the inherent delay of the radar target simulator after the reference radar receives the echo signal.
Further, the method for calculating the difference frequency compensation value and the phase difference compensation value according to the waveform characteristic parameter and the distance value is calculated by adopting the following formula:
Figure BDA0003921218910000031
Figure BDA0003921218910000032
wherein R is 0 The distance value corresponding to the inherent delay of the radar target simulator is C is the speed of light, B SW For the total bandwidth of the waveform, T CPI For the transmission period of MFSK signals, f shift For the frequency difference of A, B waveforms in the MFSK signal, f B For the difference frequency compensation value,
Figure BDA0003921218910000033
is a phase difference compensation value.
Further, the process of finding the starting position of the MFSK waveform by using the MFSK waveform starting point detection method includes the following steps:
step 5.1, calculating an average frequency value in a frequency sliding window according to the instantaneous frequency of the MFSK signal;
step 5.2, judging the type of the MFSK waveform according to the frequency domain diagram, and converting out the maximum point position of the frequency hopping according to the characteristics of the corresponding MFSK waveform: if the MFSK waveform is a sawtooth frequency modulation MFSK waveform, average frequency values in two adjacent frequency sliding windows are compared, and when the difference value of the first group of adjacent average frequencies is detected to be greater than half of the maximum frequency stepping amount of the MFSK, the current position is determined to be the maximum point position t of the frequency hopping max The method comprises the steps of carrying out a first treatment on the surface of the If the MFSK waveform is a triangular frequency modulation MFSK waveform, the adjacent frequency value satisfies that the average value of the frequency of two adjacent code elements is larger than f in the rising process max And/2 is a mutation point, and the difference value of two adjacent code element frequencies in the falling process is larger than f max 2 is a mutation point, and when the ascending mutation point is switched to the descending mutation point for the first time, the starting position of the waveform is considered to be found;
and 5.3, judging the type of the MFSK waveform according to the frequency domain diagram of the MFSK signal, and converting the position of the waveform starting point by comparing the characteristics of the corresponding MFSK waveform.
Further, in the step 5.3, the method for converting the waveform starting point position against the corresponding MFSK waveform characteristics is as follows: if the MFSK waveform is a sawtooth frequency modulation MFSK waveform, the moment T corresponding to the waveform starting position s Denoted as T s ＝t max The method comprises the steps of carrying out a first treatment on the surface of the If the MFSK waveform is a triangular frequency modulation MFSK waveform, the moment T corresponding to the initial position of the waveform s Denoted as T s ＝t max -T code The method comprises the steps of carrying out a first treatment on the surface of the Wherein IDLE is the time length of stopping the transmission of waveform signals, T code Is the waveform symbol width.
Further, the method for obtaining the phase shift output by performing symbol matching according to the initial position is as follows:
and using the initial position as a trigger signal, resetting the code element width counter to calculate the code element width, generating a reset signal when the count value is the code element width, simultaneously counting the reset signal to obtain the code element number, selecting the phase shift output of the A code if the code element number is even, and selecting the phase shift output of the B code if the code element number is odd.
Further, the delay compensation signal is generated according to the difference frequency compensation value, the phase difference compensation value and the phase shift output by adopting a DDS method.
The beneficial effects are that:
the invention obtains the transmitting signal of the radar, adds frequency offset information into the transmitting signal to obtain the echo signal of the transmitting signal, and achieves the aim of reducing the distance of the nearest target object which can be simulated by the radar target simulator, thereby realizing the technical effect that the nearest distance of the target object which can be simulated by the radar target simulator is not limited by inherent delay of ADC and DAC devices and delay of a signal processing unit.
Drawings
Fig. 1 is a flowchart of a near-field target simulation method for an MFSK waveform radar provided by the present invention.
Fig. 2 is a flow chart of a target simulation method of a radar target simulator based on the conventional DRFM technology.
Fig. 3 is a schematic diagram of a sawtooth frequency modulation MFSK waveform starting point detection method adopted by the near-field target simulation method for the MFSK waveform radar according to the present invention.
Fig. 4 is a schematic diagram of a method for detecting a triangle frequency modulation MFSK waveform starting point used in a near-field target simulation method for an MFSK waveform radar according to the present invention.
Fig. 5 is a flowchart of a MFSK waveform symbol matching method used in a near-field target simulation method for an MFSK waveform radar according to the present invention.
Detailed Description
The invention will now be described in detail by way of example with reference to the accompanying drawings.
The invention provides a near-distance target simulation method for an MFSK waveform radar, which has the following basic ideas: aiming at the problem that the existing radar target simulator based on the DRFM technology cannot perform close-range simulation, a relevant signal processing algorithm is adopted to perform delay compensation on the inherent delay of the system, so that the nearest distance of a simulation target is not limited by the inherent delay of the system, the simulation of the close-range target of the radar to be detected is realized, and the nearest distance of the simulation target can reach zero meters.
The invention provides a near-field target simulation method for an MFSK waveform radar, which is shown in a figure 1, and specifically comprises the following steps:
step 1, determining a reference radar of an MFSK waveform radar, transmitting an MFSK signal by using the reference radar, directly transmitting an echo signal without any modulation after a radar target simulator receives the MFSK signal, and analyzing to obtain a distance value R corresponding to the inherent delay of the radar target simulator after the reference radar receives the echo signal 0 。
Step 2, after receiving the MFSK transmitting signal, obtaining the instantaneous frequency of the MFSK signal by using a channelized frequency measurement technology, further obtaining a time-frequency diagram of the MFSK signal, and reading the waveform total bandwidth B of the waveform of the MFSK signal through the time-frequency diagram SW Period T of emission CPI Frequency difference f between two waveforms of A, B shift And (3) the waveform characteristic parameters are equalized, and according to the working characteristics of the MFSK waveform, the starting position of the MFSK waveform is found by adopting a MFSK waveform starting point detection method.
In the detection process of the MFSK waveform initial position in the invention, as shown in fig. 3 and 4, the detection process specifically comprises the following steps:
step 2.1, calculating an average frequency value in a frequency sliding window according to the measured waveform real-time frequency;
step 2.2, judging the type of the MFSK waveform according to the frequency domain diagram, and converting out the maximum point position of the frequency hopping according to the characteristics of the corresponding MFSK waveform: if the MFSK waveform is a sawtooth frequency modulation MFSK waveform, average frequency values in two adjacent frequency sliding windows are compared, and when the difference value of the first group of adjacent average frequencies is detected to be greater than half of the maximum frequency stepping amount of the MFSK, the current position is determined to be the maximum point position t of the frequency hopping max The method comprises the steps of carrying out a first treatment on the surface of the If the MFSK waveform is a triangular frequency modulation MFSK waveform, the adjacent frequency value satisfies that the average value of the frequency of two adjacent code elements is larger than f in the rising process max And/2 is a mutation point, and the difference value of two adjacent code element frequencies in the falling process is larger than f max And/2 is a mutation point, and when the ascending mutation point is changed into the descending mutation point for the first time, the initial position of the waveform is considered to be found.
Step 2.3, judging the type of the MFSK waveform according to the frequency domain diagram, and converting the position of the waveform starting point by comparing the characteristics of the corresponding MFSK waveform: if the MFSK waveform is a sawtooth frequency modulation MFSK waveform, as shown in FIG. 3, the time T corresponding to the waveform start position s Denoted as T s ＝t max The method comprises the steps of carrying out a first treatment on the surface of the If the MFSK waveform is a triangular FM MFSK waveform, as shown in FIG. 4, the time T corresponding to the waveform start position s Expressed as: t (T) s ＝t max -T code The method comprises the steps of carrying out a first treatment on the surface of the If the MSFK waveform is of other types, searching the position t of the maximum point of the frequency jump according to the frequency sliding window max Converting the waveform initial position T according to the characteristics s Corresponding time; wherein IDLE is the time length of stopping the transmission of waveform signals, T code Is the waveform symbol width.
Detecting a real-time frequency value obtained by channelized frequency measurement by using a waveform starting point detection method, thereby obtaining the starting time of a radar signal working frequency band, and starting complex multiplication of a delay compensation signal and a radar signal at the starting time. Because the frequency measurement has a certain time delay, a phase difference calibration value is also required to be set, and the phase difference of the multiplied signals is calibrated, so that the waveform synchronization is completed.
And step 3, performing symbol matching according to the initial position of the MFSK waveform to obtain phase shift output.
Specifically, the process of performing symbol matching according to the start position of the MFSK waveform, as shown in fig. 5, includes: the initial position of the waveform is used as a trigger signal, a reset code element width counter calculates the code element width, generates a reset signal when the count value is the code element width, and counts the reset signal (the count value is the current code element number); because of symbol alternation, whether the code is A code or B code can be distinguished according to the number of the symbols, and corresponding phase shift parameter output is selected, namely phase shift output of the A code is selected when the number of the counts is even, and phase shift output of the B code is selected when the number of the counts is odd.
Step 4, according to the distance value R 0 And calculating waveform characteristic parameters to obtain a difference frequency compensation value and a phase difference compensation value; and (3) generating a delay compensation signal according to the difference frequency compensation value, the phase difference compensation value and the phase shift output determined in the step (3) by adopting a DDS method.
The invention is based on the distance value R 0 Calculating difference frequency compensation value f by waveform parameters B And phase difference compensation value
Figure BDA0003921218910000073
The method is that the following formula is adopted for calculation:
Figure BDA0003921218910000071
Figure BDA0003921218910000072
wherein R is 0 The inherent delay of the radar target simulator corresponds to a distance value, C is the speed of light, B SW For the total bandwidth of the waveform, T CPI For the transmission period of MFSK signals, f shift Is the frequency difference between the A, B waveforms in the MFSK signal.
And 5, carrying out complex multiplication on the delay compensation signal and the MFSK signal at the initial position of the MFSK waveform to obtain a delay compensated signal.
Step 6, roughly adjusting a distance value corresponding to the inherent delay of the system until the difference value between the simulation target distance value measured by the radar and the set simulation target distance value is within the rough adjustment precision range of the distance value corresponding to the inherent delay of the system; the fine tuning system delays the corresponding distance value and the phase difference calibration value until the distance between the simulation target measured by the radar and the set simulation target is within the range of the range error of the radar, and the speed of the simulation target measured by the radar is zero.
Specifically, setting a simulation target with a fixed distance, and coarsely adjusting a distance value corresponding to the inherent delay of the system until the distance of the simulation target measured by the radar is consistent with the set distance of the simulation target; and finely adjusting a distance value and a phase difference calibration value corresponding to the inherent delay of the system until the distance of the simulation target measured by the radar is consistent with the set distance of the simulation target and the speed of the simulation target measured by the radar is zero, thereby eliminating the nearest distance limit of the inherent delay of the system to the simulation close target.
Because the method only needs to know the B of the MFSK waveform radar in advance SW 、T CPI And f shift The delay compensation signal is generated by the waveform characteristic parameters, and then the compensation of the inherent delay corresponding distance of the system can be completed through waveform synchronization, so that the method plays a role in radar ranging and speed measuring by using the MFSK waveform. The waveform characteristic parameters are typically provided by the radar side or measured by a channelized frequency measurement module.
For radars that use MFSK waveforms for distance and speed measurements, the common solution of distance and speed is typically achieved by extracting the difference frequency and phase difference from the radar echoes. In this application, the delay compensation includes compensation of the difference frequency and phase difference at the radar side due to the system inherent delay. Compensating the difference frequency value f caused by the inherent delay of the system at the radar end B_radar And the difference frequency compensation value f B Phase difference delta phi radar The difference frequency compensation value delta phi has the same numerical value and opposite sign.
After the corresponding distance value of the inherent delay of the coarse tuning system is adopted, the corresponding distance value of the inherent delay of the system is basically compensated, the set simulated target distance value is basically consistent with the radar distance detection value, but the compensating deviation of the difference frequency and the phase difference can lead to the target speed detected by the radar to be different. Because the waveform synchronization position has deviation, after the target distance value is correctly adjusted through the inherent delay corresponding distance value of the coarse adjustment system, the inherent delay corresponding distance value of the fine adjustment system and the phase difference calibration value are adjusted, so that the speed deviation can not be introduced in the current phase difference compensation, and the target speed detected by the radar is 0. The system inherent delay is compensated after the corresponding distance value of the system inherent delay is roughly adjusted and finely adjusted, so that the nearest distance limit of the system inherent delay to the simulation close-range target can be eliminated, and the nearest zero-meter target can be simulated.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A near-field target simulation method for an MFSK waveform radar is characterized by comprising the following steps:
acquiring a waveform characteristic parameter of the MFSK waveform radar and a distance value corresponding to the inherent delay of the radar target simulator, and calculating to obtain a difference frequency compensation value and a phase difference compensation value according to the waveform characteristic parameter and the distance value; finding the initial position of the MFSK waveform by adopting an MFSK waveform initial point detection method, and performing symbol matching according to the initial position to obtain phase shift output; generating a delay compensation signal according to the difference frequency compensation value, the phase difference compensation value and the phase shift output; carrying out complex multiplication on the delay compensation signal and the MFSK signal at the initial position to obtain a delay compensated signal; coarse-adjusting the distance value corresponding to the inherent delay of the system until the difference value between the simulation target distance value measured by the radar and the set simulation target distance value is within the coarse-adjusting precision range of the distance value corresponding to the inherent delay of the system; the fine tuning system delays the corresponding distance value and the phase difference calibration value until the distance between the simulation target measured by the radar and the set simulation target distance are within the range of the range error of the radar, and the speed of the simulation target measured by the radar is zero.
2. The near-field target simulation method according to claim 1, wherein the mode of acquiring the waveform characteristic parameters of the MFSK waveform radar is as follows: obtaining the instantaneous frequency of the MFSK signal by using a channelized frequency measurement technology, further obtaining a time-frequency diagram of the MFSK signal, and reading waveform characteristic parameters of the waveform of the MFSK signal through the time-frequency diagram, wherein the waveform characteristic parameters comprise the total bandwidth B of the waveform SW Period T of emission CPI A, B of two sets of waveformsFrequency difference f shift 。
3. The near-field target simulation method according to claim 1, wherein the distance value corresponding to the inherent delay of the radar target simulator is obtained by: determining a reference radar of an MFSK waveform radar class, transmitting an MFSK signal by using the reference radar, directly transmitting an echo signal after the radar target simulator receives the MFSK signal, and analyzing to obtain a distance value corresponding to the inherent delay of the radar target simulator after the reference radar receives the echo signal.
4. The near-field target simulation method according to claim 1, wherein the difference frequency compensation value and the phase difference compensation value are calculated according to the waveform characteristic parameter and the distance value by adopting the following formula:
Figure FDA0003921218900000021
Figure FDA0003921218900000022
wherein R is 0 The distance value corresponding to the inherent delay of the radar target simulator is C is the speed of light, B SW For the total bandwidth of the waveform, T CPI For the transmission period of MFSK signals, f shift For the frequency difference of A, B waveforms in the MFSK signal, f B For the difference frequency compensation value,
Figure FDA0003921218900000023
is a phase difference compensation value.
5. The near field target simulation method of claim 1, wherein the process of finding the starting position of the MFSK waveform using the MFSK waveform starting point detection method comprises the steps of:
step 5.1, calculating an average frequency value in a frequency sliding window according to the instantaneous frequency of the MFSK signal;
step 5.2, judging the type of the MFSK waveform according to the frequency domain diagram, and converting out the maximum point position of the frequency hopping according to the characteristics of the corresponding MFSK waveform: if the MFSK waveform is a sawtooth frequency modulation MFSK waveform, average frequency values in two adjacent frequency sliding windows are compared, and when the difference value of the first group of adjacent average frequencies is detected to be greater than half of the maximum frequency stepping amount of the MFSK, the current position is determined to be the maximum point position t of the frequency hopping max The method comprises the steps of carrying out a first treatment on the surface of the If the MFSK waveform is a triangular frequency modulation MFSK waveform, the adjacent frequency value satisfies that the average value of the frequency of two adjacent code elements is larger than f in the rising process max And/2 is a mutation point, and the difference value of two adjacent code element frequencies in the falling process is larger than f max 2 is a mutation point, and when the ascending mutation point is switched to the descending mutation point for the first time, the starting position of the waveform is considered to be found;
and 5.3, judging the type of the MFSK waveform according to the frequency domain diagram of the MFSK signal, and converting the position of the waveform starting point by comparing the characteristics of the corresponding MFSK waveform.
6. The near-field target simulation method according to claim 5, wherein the method of converting the waveform start point position against the corresponding MFSK waveform characteristics in step 5.3 is as follows: if the MFSK waveform is a sawtooth frequency modulation MFSK waveform, the moment T corresponding to the waveform starting position s Denoted as T s ＝t max The method comprises the steps of carrying out a first treatment on the surface of the If the MFSK waveform is a triangular frequency modulation MFSK waveform, the moment T corresponding to the initial position of the waveform s Denoted as T s ＝t max -T code The method comprises the steps of carrying out a first treatment on the surface of the Wherein IDLE is the time length of stopping the transmission of waveform signals, T code Is the waveform symbol width.
7. The near field target simulation method of claim 1, wherein the means for performing symbol matching according to the starting position to obtain the phase shift output is as follows:
and using the initial position as a trigger signal, resetting the code element width counter to calculate the code element width, generating a reset signal when the count value is the code element width, simultaneously counting the reset signal to obtain the code element number, selecting the phase shift output of the A code if the code element number is even, and selecting the phase shift output of the B code if the code element number is odd.
8. The near field target simulation method of claim 1 wherein the delay compensation signal is generated according to the difference frequency compensation value, the phase difference compensation value and the phase shift output by using a DDS method.
CN202211372426.0A 2022-11-01 2022-11-01 Near-distance target simulation method for MFSK waveform radar Pending CN116299410A (en)

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