CN108051783A - Wide band net echo simulator emits multichannel delay compensation method and system - Google Patents

Abstract

The present invention relates to a kind of wide band net echo simulator transmitting multichannel delay compensation method and systems, belong to electronic technology field.Employ the wide band net echo simulator transmitting multichannel delay compensation method and system of the present invention, due to its using based on the variable fraction filtering wave by prolonging time device that Taylor expansion obtains to broadband signal carry out time-domain filtering, realize the delay of high-precision fraction, it realizes that high-precision integer is delayed by shift register again, and then realizes the multichannel transmission channel compensation of delay of wide band net echo simulator.The program is based on FPGA accurately timing control, fast parallel processing capacity, combined digital signal treatment technology, can effectively reduce that system is relatively low for hardware requirement, and compensation precision is high, and especially suitable for the compensation of delay of bandwidth varying scene.

Description

Multi-channel delay compensation method and system for wideband phased array radar echo simulator launch

technical field

The present invention relates to the field of electronic technology, in particular to the field of radar simulation technology, in particular to a multi-channel delay compensation method and system for wideband phased array radar echo simulator emission.

Background technique

Phased array radar using broadband signals can obtain very high range resolution and will be widely used in the next generation of multifunctional radar systems. In the process of developing and debugging the broadband phased array radar system and each subsystem, the traditional radar simulator cannot meet the test requirements of wideband digital array radar such as large bandwidth, multi-channel, and multi-working mode, so it is necessary to develop a dedicated broadband digital array radar simulator. Array radar simulator. When the wide-band phased array is used for wide-angle scanning, the beam cannot be effectively formed only by phase control, and precise beam pointing control must use precise time delay compensation between array elements or sub-arrays. Therefore, it is necessary to solve the problem of high-precision delay control of multi-channel broadband signals.

The traditional broadband phased array radar simulator uses the idea of analog delay line to control the signal delay between units, that is, the digital delay line with M bit state, the minimum delay is one wavelength, and the maximum delay is 2 For ^M wavelengths, the delay accuracy of the digital delay line affects the consistency of the phase. If the delay accuracy is Δτ, the center frequency phase error is:

Among them, T is the signal period. When the broadband signal is working, the delay is calculated according to the center frequency, and the side frequency phase error Δp is

Δp=360°×Δτ×Δf

In the formula, Δf is the frequency difference between the center frequency and the variable frequency. Therefore, the delay accuracy of the digital delay line not only affects the phase error of the center frequency, but more importantly, affects the phase error of the side frequency signal in the array. The higher the value, the smaller the phase error. The delay accuracy of the digital delay line using the M-bit state cannot meet the phase accuracy requirements of the digital beamforming of the broadband phased array radar simulator.

The traditional fractional delay filter is realized by windowing method, but the windowing method needs to generate different filter coefficients for different delays, and the delay required for beamforming changes with the change of the radar pattern pointing, using The windowing method needs to store large-scale filter coefficients, which is obviously very difficult to implement in hardware.

Furthermore, the variable fractional delay filter based on the Farrow structure can effectively avoid this problem, but the Farrow structure requires a large number of multipliers and adders as the order of the filter increases, and the calculation of the filter coefficients is large and difficult. high.

Therefore, how to provide a compensation method that requires less hardware, has high compensation accuracy, and is applicable to variable bandwidth scenarios has become an urgent problem to be solved in this field.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned shortcomings in the prior art, and provide a multi-channel delay compensation method for launching a broadband phased array radar echo simulator that has low hardware requirements, high compensation accuracy, and is suitable for variable bandwidth scenarios. and system.

In order to achieve the above-mentioned purpose, the broadband phased array radar echo simulator of the present invention launches multi-channel delay compensation method comprising the following steps:

(1) Determine the delay of each unit of the radar relative to the reference unit according to the geometric structure of the antenna array, and decompose the delay into integer delay and fractional delay;

(2) Utilize a variable fractional delay filter obtained based on the Taylor expansion method and carry out time-domain filtering to the broadband signal according to the fractional delay amount, so as to realize the high-precision fractional delay of the signal;

(3) Utilize the integer delayer and realize the high-precision integer delay of the signal according to the integer delay amount;

(4) Cascading the variable fractional delay filter and the integer delayer, realizing multi-channel high-precision digital delay based on the high-precision fractional delay and the high-precision integer delay Time.

In this wideband phased array radar echo simulator launch multi-channel delay compensation method, the variable fractional delay filter obtained based on the Taylor expansion method described in step (2) is specifically:

The ideal impulse response of the variable fractional delay filter is:

h(n)=sinc(n-D)

In the formula, D represents the amount of delay;

The frequency response of the variable fractional delay filter and its Taylor expansion are:

In the formula, D represents the amount of delay, z ^-1 represents the delay unit, N represents the order of the filter, and the filter is an odd-order filter, d is the fractional delay amount.

In this broadband phased array radar echo simulator launch multi-channel delay compensation method, described step (3) is specifically:

Utilize the sampling clock of the signal to drive a shift register, use the signal to be delayed as the data input of the shift register, configure the stages of the shift register according to the integer delay amount, and the output of the shift register The signal is a signal after a high-precision integer delay.

In this wideband phased array radar echo simulator launch multi-channel delay compensation method, the delay amount D is located in the middle part of the ideal impulse response, and the order N of the filter is given to achieve The best approximation of the ideal fractional filter to achieve delay compensation with minimal error.

In this wideband phased array radar echo simulator launching multi-channel delay compensation method, the coefficient of the filter is only related to the order N of the filter and the delay D, and the order of the filter When N is given, different delays can be realized by changing the delay amount D.

The invention also provides a broadband phased array radar echo simulator launch multi-channel delay compensation system, the system includes: a delay amount decomposition module, a variable fractional delay filter, an integer delayer and a cascade module.

Wherein, the delay amount decomposition module is used to determine the delay amount of each radar unit relative to the reference unit according to the geometric structure of the antenna array, and decompose the delay amount into an integer delay amount and a fractional delay amount;

The variable fractional delay filter is obtained based on the Taylor expansion method, and the variable fractional delay filter performs time-domain filtering on the broadband signal according to the fractional delay amount to realize high-precision fractional delay of the signal;

Integer delay device, in order to realize the high-precision integer delay of signal according to described integer delay amount;

The cascading module is used to cascade the variable fractional delay filter and the integer delayer, and realize multi-channel high-speed delay based on the high-precision fractional delay and the high-precision integer delay Precision digital delay.

In the broadband phased array radar echo simulator launch multi-channel delay compensation system, the variable fractional delay filter obtained based on the Taylor expansion method is specifically:

The ideal impulse response of the variable fractional delay filter is:

h(n)=sinc(n-D)

In the formula, D represents the amount of delay;

The frequency response of the variable fractional delay filter and its Taylor expansion are:

In the formula, D represents the amount of delay, z ^-1 represents the delay unit, N represents the order of the filter, and the filter is an odd-order filter, d is the fractional delay amount.

In the broadband phased array radar echo simulator launching multi-channel delay compensation system, the integer delayer is specifically: using the sampling clock of the signal to drive a shift register, and using the signal to be delayed as the shift register The data input, the number of stages of the shift register is configured according to the integer delay amount, and the output signal of the shift register is a signal after a high-precision integer delay.

In the multi-channel delay compensation system launched by the broadband phased array radar echo simulator, the delay D is located in the middle part of the ideal impulse response, and the order N of the filter is given to achieve The best approximation of the ideal fractional filter to achieve delay compensation with minimal error.

In the multi-channel delay compensation system launched by the wideband phased array radar echo simulator, the coefficient of the filter is only related to the order N of the filter and the delay D, and the order of the filter When N is given, different delays can be realized by changing the delay amount D.

The method and system for transmitting multi-channel delay compensation of the wideband phased array radar echo simulator of the invention is adopted, because it uses the variable fractional delay filter obtained based on the Taylor expansion method to filter the wideband signal in the time domain, realizing high Accurate fractional delay, and then realize high-precision integer delay through the shift register, and then realize the multi-channel transmit channel delay compensation of the wideband phased array radar echo simulator. Based on FPGA's precise timing control and fast parallel processing capabilities, combined with digital signal processing technology, this solution can effectively reduce the system's low hardware requirements and high compensation accuracy, and is especially suitable for delay compensation in variable bandwidth scenarios.

Description of drawings

Fig. 1 is a flow chart of the steps of the multi-channel delay compensation method for the broadband phased array radar echo simulator of the present invention.

Fig. 2 is a structural block diagram of the broadband phased array radar echo simulator launch multi-channel delay compensation system in the simulation system of the present invention.

Fig. 3 is a schematic diagram of the simulation array geometry model of the present invention.

Fig. 4 is a structural principle diagram of the variable fractional delay filter of the present invention.

Fig. 5 is a curve diagram of the magnitude response of the variable fractional delay filter of the present invention.

Fig. 6 is a graph showing the phase delay response curve of the variable fractional delay filter of the present invention.

Fig. 7 is the preset delay of the delay control method of the present invention Screenshots of actual time-delay signal oscilloscope measurements.

Fig. 8 is the preset delay of the delay control method of the present invention Screenshots of actual time-delay signal oscilloscope measurements.

FIG. 9 is a simulation diagram of traditional phase shifting to realize broadband signal transmission beamforming.

FIG. 10 is a simulation diagram of broadband signal transmission beamforming in the present invention.

Detailed ways

In order to understand the technical content of the present invention more clearly, the following examples are given in detail.

Please refer to FIG. 1 , which is a flow chart of the steps of the multi-channel delay compensation method for the broadband phased array radar echo simulator of the present invention.

In one embodiment, the broadband phased array radar echo simulator transmits a multi-channel delay compensation method, as shown in Figure 1 and Figure 2, comprising the following steps:

(1) Determine the delay of each unit of the radar relative to the reference unit according to the geometric structure of the antenna array, and decompose the delay into integer delay and fractional delay;

(2) Utilize a variable fractional delay filter obtained based on the Taylor expansion method and carry out time-domain filtering to the broadband signal according to the fractional delay amount, so as to realize the high-precision fractional delay of the signal;

(3) Utilize the integer delayer and realize the high-precision integer delay of the signal according to the integer delay amount;

(4) Cascading the variable fractional delay filter and the integer delayer, realizing multi-channel high-precision digital delay based on the high-precision fractional delay and the high-precision integer delay Time.

The broadband phased array radar echo simulator launch multi-channel delay compensation system implementing the method described in the above embodiment includes: a delay amount decomposition module, a variable fractional delay filter, an integer delayer and a cascade module.

Wherein, the delay amount decomposition module is used to determine the delay amount of each radar unit relative to the reference unit according to the geometric structure of the antenna array, and decompose the delay amount into an integer delay amount and a fractional delay amount;

The variable fractional delay filter is obtained based on the Taylor expansion method, and the variable fractional delay filter performs time-domain filtering on the broadband signal according to the fractional delay amount to realize high-precision fractional delay of the signal;

Integer delay device, in order to realize the high-precision integer delay of signal according to described integer delay amount;

The cascading module is used to cascade the variable fractional delay filter and the integer delayer, and realize multi-channel high-speed delay based on the high-precision fractional delay and the high-precision integer delay Precision digital delay.

In a preferred embodiment, the variable fraction delay filter obtained based on the Taylor expansion method described in step (2) is specifically:

The ideal impulse response of the variable fractional delay filter is:

h(n)=sinc(n-D)

In the formula, D represents the amount of delay;

The frequency response of the variable fractional delay filter and its Taylor expansion are:

In the formula, D represents the amount of delay, z ^-1 represents the delay unit, N represents the order of the filter, and the filter is an odd-order filter, d is the fractional delay amount.

And described step (3) is specifically:

Utilize the sampling clock of the signal to drive a shift register, use the signal to be delayed as the data input of the shift register, configure the stages of the shift register according to the integer delay amount, and the output of the shift register The signal is a signal after a high-precision integer delay.

In a more preferred embodiment, the delay D is located in the middle of the ideal impulse response, and the order N of the filter is given to realize the minimum by realizing the best approximation of the ideal fractional filter Error delay compensation. The coefficients of the filter are only related to the order N of the filter and the delay D. When the order N of the filter is given, different delays can be realized by changing the delay D.

In practical applications, the wideband phased array radar echo simulator of the present invention transmits a multi-channel delay compensation method may include the following steps:

Step A, determine the delay of each unit of the radar relative to the reference unit according to the geometric structure of the antenna array, and decompose it into an integer delay and a fractional delay;

Referring to Figure 3, with array element 0 as the reference array element, the steering vector of the array unit signal is:

In the formula, L is the distance between the array elements, θ _B is the angle between the incident direction of the echo and the vertical line of the array, the number of array elements is N, and λ is the signal wavelength.

The delay difference between adjacent array elements is:

In the formula, L is the distance between the array elements, θ _B is the angle between the incident direction of the echo and the vertical line of the array, and c is the speed of light.

The delay amount τ _k of the kth array element relative to the reference array element is:

Through the delay time τ _k and the wideband LFM signal sampling interval T _s , the integer delay amount is obtained and fractional delay In the formula Indicates that it is not greater than largest integer of .

Step B. Obtain a variable fractional delay filter implementation structure through the Taylor expansion method, that is, a Taylor structure variable fractional delay filter, which performs time-domain filtering on broadband signals to achieve high-precision fractional delay of the signal, specifically for:

The ideal impulse response of a fractional delay filter is:

h(n)=sinc(n-D)

In the formula, D represents the amount of delay;

The frequency response of the variable fractional delay filter and its Taylor expansion are:

In the formula, D represents the amount of delay, z ^-1 represents the delay unit, N represents the order of the filter, and the filter is usually an odd-order filter, d is the fractional delay;

If the radar signal bandwidth is 200Mhz and the sampling rate is 250Mhz, the passband bandwidth of the variable fractional delay filter is 0.8π, so the order of the filter is set to 81.

With reference to the structure of the variable fraction time-delay filter of Fig. 4, the required coefficients at each level can be obtained;

Step C, realize the high-precision integer delay of the signal through the shift register, specifically:

The shift register is driven by the sampling clock of the signal, the delayed signal is used as data input, the number of stages of the shift register is correctly configured according to the required integer delay amount, and the output of the shift register is the delayed signal.

The frequency response of the integer delay filter is

H _I (z) = z ^-I

If the integer delay amount is 8, the number of stages of the shift register is 8, and the driving clock of the shift register is T _s is the sampling interval of the broadband LFM signal.

Step D, cascading the variable fractional time-delay filter designed in the above step B and the integer time-delay device designed in step C, then the frequency response of the digital time-delay filter is:

H _d (z) = H _I (z) H (z)

Method of the present invention has passed verification, obtained satisfactory application effect:

(1) Experimental conditions: The center frequency of the radar working corresponding to the broadband phased array radar simulator is 1.375Ghz, the array unit is a uniform linear array of 64 units, the array element spacing is half of the maximum wavelength, and the desired signal beam direction is θ _B =-60°, the signal form is linear frequency modulation signal, the bandwidth is 200Mhz, the time width is 20us, and the sampling rate is 250Mhz.

(2) Simulation content:

Simulation 1: Based on the simulation parameters: the order of the variable fractional delay filter is set to 81, and the variable fractional delay filter of the Taylor structure is designed. Figure 5 shows the amplitude characteristics of the fractional delay filter, and Figure 6 The phase delay characteristics of the fractional delay filter are given, and the fractional delay values are d=0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9. Figure 7 shows the measured waveform diagram when the integer delay value is 8 and the fractional delay value is 0.0. Figure 8 shows the measured waveform diagram when the integer delay value is 8 and the fractional delay value is 0.1.

Simulation 2: Based on the filter designed above, broadband digital beamforming is performed. Figure 10 shows the broadband signal transmission beam pattern formed by the method proposed in the present invention. Figure 9 shows the broadband signal transmission beam obtained only by phase shifting method. Beam diagram.

(3) Simulation result analysis:

It can be seen from Fig. 5 that the amplitude characteristics of the fractional delay filter designed in the present invention are very flat in the range [0, 0.8π].

It can be seen from FIG. 6 that the phase delay characteristic of the fractional delay filter designed in the present invention is very flat in the range of [0, 0.8π].

In Figure 7, the integer delay value is 8, the fractional delay value is 0.0, the FPGA operating frequency is 250MHz, the theoretical delay value is 32ns, and the actual measurement is 32.00ns, which verifies the effectiveness of the integer delay control.

In Figure 8, the integer delay value is 8, the fractional delay value is 0.1, the FPGA operating frequency is 250MHz, the theoretical delay value is 32.4ns, and the measured value is 32.40ns, which verifies the effectiveness of the fractional delay filter.

Fig. 9 shows the traditional phase shifting to realize the beamforming simulation of wideband signal transmission, which shows that the beam direction formed by only the phase shifting method changes with the change of the operating frequency. However, FIG. 10 is a transmission beam diagram formed by the method based on delay compensation proposed by the present invention. The beam pointing does not change with the change of the operating frequency, and wide-band wide-angle scanning is realized. , indicating that the proposed method of the present invention is correct.

Can confirm thus, above technical scheme of the present invention compares with prior art, has following technical effect:

(1) Utilize the signal processing resources and register resources of FPGA to design the digital delay filter, replace the analog delay line with real-time digital delay, and replace the delay of windowing method with the variable fractional delay filter of Taylor structure Time filter and variable fractional delay filter based on Farrow structure realize high-precision delay control of broadband signals;

(2) In general, the N-order variable fractional delay filter, the Farrow structure requires N ² +N multipliers and N ² adders, while the Taylor structure only requires 3N-2 multipliers and 3N-1 additions device. As the order increases, the Taylor structure will save a lot of multipliers and adders compared to the Farrow structure.

(3) As the bandwidth changes, the coefficients of the variable fractional delay filter based on the Farrow structure need to be recalculated and the calculation process is mainly a vector operation, which is difficult to implement in real time on the FPGA, while the variable fractional delay based on the Taylor structure The increase of the filter bandwidth is consistent with the increase of the filter order, and the relationship between the filter coefficient and the order is obvious, which is suitable for the scene where the bandwidth is variable in real time.

The method and system for transmitting multi-channel delay compensation of the wideband phased array radar echo simulator of the invention is adopted, because it uses the variable fractional delay filter obtained based on the Taylor expansion method to filter the wideband signal in the time domain, realizing high Accurate fractional delay, and then realize high-precision integer delay through the shift register, and then realize the multi-channel transmit channel delay compensation of the wideband phased array radar echo simulator. Based on FPGA's precise timing control and fast parallel processing capabilities, combined with digital signal processing technology, this solution can effectively reduce the system's low hardware requirements and high compensation accuracy, and is especially suitable for delay compensation in variable bandwidth scenarios.

In this specification, the invention has been described with reference to specific embodiments thereof. However, it is obvious that various modifications and changes can be made without departing from the spirit and scope of the invention. Accordingly, the specification and drawings are to be regarded as illustrative rather than restrictive.

Claims (10)

1. a kind of broadband phased array radar echo emulator launches multi-channel delay compensation method, it is characterized in that, the method comprises the following steps: (1) Determine the delay of each unit of the radar relative to the reference unit according to the geometric structure of the antenna array, and decompose the delay into integer delay and fractional delay; (2) Utilize a variable fractional delay filter obtained based on the Taylor expansion method and carry out time-domain filtering to the broadband signal according to the fractional delay amount, so as to realize the high-precision fractional delay of the signal; (3) Utilize the integer delayer and realize the high-precision integer delay of the signal according to the integer delay amount; (4) Cascading the variable fractional delay filter and the integer delayer, realizing multi-channel high-precision digital delay based on the high-precision fractional delay and the high-precision integer delay Time. 2. broadband phased array radar echo simulator according to claim 1 launches multi-channel delay compensation method, it is characterized in that, the variable fractional delay filter obtained based on Taylor expansion method described in step (2) The device is specifically: The ideal impulse response of the variable fractional delay filter is: h(n)=sinc(n-D) In the formula, D represents the amount of delay; The frequency response of the variable fractional delay filter and its Taylor expansion are: <mrow><mrow><mo>(</mo><mi>z</mi><mo>,</mo><mi>D</mi><mo>)</mo></mrow><mo>=</mo><msup><mi>z</mi><mrow><mo>-</mo><mi>D</mi></mrow></msup><mo>=</mo><munderover><mi>&amp;Sigma;</mi><mrow><mi>n</mi><mo>=</mo><mn>0</mn></mrow><mi>N</mi></munderover><msup><mrow><mo>(</mo><mo>-</mo><mn>1</mn><mo>)</mo></mrow><mi>n</mi></msup><mfrac><mrow><mi>D</mi><mrow><mo>(</mo><mi>D</mi><mo>-</mo><mn>1</mn><mo>)</mo></mrow><mo>.</mo><mo>.</mo><mo>.</mo><mrow><mo>(</mo><mi>D</mi><mo>-</mo><mi>N</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow></mrow><mrow><mi>n</mi><mo>!</mo></mrow></mfrac><msup><mrow><mo>(</mo><mn>1</mn><mo>-</mo><msup><mi>z</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>)</mo></mrow><mi>n</mi></msup></mrow> In the formula, D represents the amount of delay, z ^-1 represents the delay unit, N represents the order of the filter, and the filter is an odd-order filter, d is the fractional delay amount. 3. broadband phased array radar echo emulator according to claim 1 launches multi-channel delay compensation method, it is characterized in that, described step (3) is specially: Utilize the sampling clock of the signal to drive a shift register, use the signal to be delayed as the data input of the shift register, configure the stages of the shift register according to the integer delay amount, and the output of the shift register The signal is a signal after a high-precision integer delay. 4. wideband phased array radar echo simulator according to claim 2 launches multi-channel delay compensation method, is characterized in that, described delay amount D is positioned at the middle part of ideal impulse response, and described filter The order N of is given to realize the delay compensation of the minimum error. 5. broadband phased array radar echo emulator according to claim 2 launches multi-channel delay compensation method, it is characterized in that, the coefficient of described filter is only with the order N of this filter and described The delay amount D is related, and when the order number N of the filter is given, different delays can be realized by changing the delay amount D. 6. A broadband phased array radar echo simulator launches a multi-channel delay compensation system, characterized in that the system includes: The delay amount decomposition module is used to determine the delay amount of each radar unit relative to the reference unit according to the geometric structure of the antenna array, and decompose the delay amount into an integer delay amount and a fractional delay amount; The variable fractional delay filter is obtained based on the Taylor expansion method, and the variable fractional delay filter performs time-domain filtering on the broadband signal according to the fractional delay amount to realize high-precision fractional delay of the signal; Integer delay device, in order to realize the high-precision integer delay of signal according to described integer delay amount; The cascading module is used to cascade the variable fractional delay filter and the integer delayer, and realize multi-channel high-speed delay based on the high-precision fractional delay and the high-precision integer delay Precision digital delay. 7. broadband phased array radar echo emulator according to claim 6 launches multi-channel delay compensation system, it is characterized in that, the variable fractional delay filter that described based on Taylor expansion method is specifically: The ideal impulse response of the variable fractional delay filter is: h(n)=sinc(n-D) In the formula, D represents the amount of delay; The frequency response of the variable fractional delay filter and its Taylor expansion are: <mrow><mi>H</mi><mrow><mo>(</mo><mi>z</mi><mo>,</mo><mi>D</mi><mo>)</mo></mrow><mo>=</mo><msup><mi>z</mi><mrow><mo>-</mo><mi>D</mi></mrow></msup><mo>=</mo><munderover><mo>&amp;Sigma;</mo><mrow><mi>n</mi><mo>=</mo><mn>0</mn></mrow><mi>N</mi></munderover><msup><mrow><mo>(</mo><mo>-</mo><mn>1</mn><mo>)</mo></mrow><mi>n</mi></msup><mfrac><mrow><mi>D</mi><mrow><mo>(</mo><mi>D</mi><mo>-</mo><mn>1</mn><mo>)</mo></mrow><mn>...</mn><mrow><mo>(</mo><mi>D</mi><mo>-</mo><mi>N</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow></mrow><mrow><mi>n</mi><mo>!</mo></mrow></mfrac><msup><mrow><mo>(</mo><mn>1</mn><mo>-</mo><msup><mi>z</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>)</mo></mrow><mi>n</mi></msup></mrow> In the formula, D represents the amount of delay, z ^-1 represents the delay unit, N represents the order of the filter, and the filter is an odd-order filter, d is the fractional delay amount. 8. wideband phased array radar echo emulator according to claim 6 launches multi-channel delay compensation system, is characterized in that, described integer delay device is specifically: utilize the sampling clock of signal to drive a shift register , the signal to be delayed is used as the data input of the shift register, the number of stages of the shift register is configured according to the integer delay amount, and the output signal of the shift register is a high-precision integer delayed signal . 9. broadband phased array radar echo emulator according to claim 7 launches multi-channel delay compensation system, is characterized in that, described delay amount D is positioned at the middle part of ideal impulse response, and described filter The order N of is given to realize the delay compensation of the minimum error. 10. broadband phased array radar echo emulator according to claim 7 launches multi-channel delay compensation system, is characterized in that, the coefficient of described filter is only with the order N of this filter and described The delay amount D is related, and when the order number N of the filter is given, different delays can be realized by changing the delay amount D.