A new system radar-based angle-range joint parameter estimation method

Abstract

The application discloses a kind of angle-distance joint parameter estimation methods based on new system radar, comprising: after receiving echo signal, echo signal is sequentially down-converted, digitally mixed and matched filtering, and output signal vector is obtained;And beam weight vector, angle difference beam weight vector and distance difference beam weight vector are calculated, and the element data in output signal vector is weighted respectively, and sum-difference beam is obtained;Based on sum-difference beam, angle dimension single-pulse ratio curve and distance dimension single-pulse ratio curve are generated respectively;According to output signal vector, and beam weight vector and angle difference beam weight vector \ distance difference beam weight vector, angle dimension sum-difference ratio \ distance dimension sum-difference ratio is calculated;The angle of far-field point target is estimated from angle dimension single-pulse ratio curve, and the distance of far-field point target is estimated from distance dimension single-pulse ratio curve.The application not only can improve the accuracy of target positioning, but also can realize the measurement of target distance, and it is also easier to realize in engineering.

Description

Technical Field

[0001] This invention belongs to the field of radar signal processing technology, specifically relating to a method for estimating angle-range joint parameters based on a new radar system. Background Technology

[0002] Target localization technology has important applications not only in military and civilian fields, but has also received widespread attention in the field of radar signal processing.

[0003] Traditional monopulse angle measurement techniques, including phase ratio angle measurement, amplitude ratio angle measurement, and uniform circular array methods, suffer from low angular resolution and poor anti-interference performance, leading to reduced accuracy in target positioning. Furthermore, traditional phased array radars are limited by their radar architecture, resulting in poor performance in resisting main lobe interference and improving target positioning accuracy, and they are also difficult to measure the target's range parameters. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention provides a method for estimating angle-range joint parameters based on a new radar system. The technical problem to be solved by this invention is achieved through the following technical solution:

[0005] This invention provides a method for joint angle-range parameter estimation based on a new radar system, applied to MIMO-STCA radar, including:

[0006] After receiving the echo signal reflected from the far-field point target, the echo signal is sequentially down-converted, digitally mixed, and matched filtered to obtain the output signal vector;

[0007] The sum beam weight vector, angle difference beam weight vector, and range difference beam weight vector are calculated, and the array data in the output signal vector are weighted respectively to obtain the sum and difference beam; the sum and difference beam includes: sum beam, angle difference beam, and range difference beam;

[0008] Based on the sum and difference beams, angular dimension single pulse ratio curves and range dimension single pulse ratio curves are generated respectively;

[0009] Based on the output signal vector, beam weight vector, and angle difference beam weight vector, calculate the angle dimension sum-difference ratio, and estimate the angle of the far-field point target from the angle dimension single pulse ratio curve;

[0010] Based on the output signal vector, beam weight vector, and range difference beam weight vector, the range dimension sum-difference ratio is calculated, and the range of the far-field point target is estimated from the range dimension single-pulse ratio curve.

[0011] In one embodiment of the present invention, the beam weight vector, angle difference beam weight vector, and range difference beam weight vector are calculated according to the following formulas:

[0012]

[0013]

[0014]

[0015] In the formula, r0 represents the radar range pointing, θ0 represents the radar angle pointing, a(r0,θ0) represents the transmit steering vector, and b(θ0) represents the receive steering vector. The Kronecker product, w θΔ = [1,1,…,-1,-1,…,-1] H H represents the conjugate transpose, ⊙ represents the Hadamard product, and a θ (θ0) represents the launch angle steering vector, a r (r0,μΔt) represents the transmit range steering vector, μ represents the modulation slope, Δt represents the time delay between adjacent transmit elements, and w rΔ = [1,-1,…,1,-1,…,1,-1] H .

[0016] In one embodiment of the present invention, the beam is represented as:

[0017]

[0018] The angle difference beam is represented as:

[0019]

[0020] The range difference beam is represented as follows:

[0021]

[0022] In the formula, v(θ, r, μΔt) represents the array data of the output signal vector, θ represents the target angle, r represents the target distance, M and N represent the number of transmitting array elements and the number of receiving array elements of the MIMO-STCA radar, respectively, d represents the array element spacing, λ represents the wavelength, j represents the imaginary unit, and c represents the speed of light.

[0023] In one embodiment of the present invention, the step of generating angular dimension monopulse ratio curves and range dimension monopulse ratio curves based on the sum and difference beams includes:

[0024] An angle-dimensional single-pulse ratio curve is generated based on the ratio of the angle difference beam to the sum beam.

[0025] A range-dimensional single-pulse ratio curve is generated based on the ratio of the range difference beam to the sum beam.

[0026] In one embodiment of the present invention, the step of generating an angular dimension single-pulse ratio curve based on the ratio of the angle difference beam to the sum beam includes:

[0027] Calculate the ratio of the angle difference beam to the sum beam, and take the imaginary part of the obtained angle difference ratio:

[0028]

[0029] In the formula, Im represents the imaginary part, and the first proportionality coefficient.

[0030] Based on the imaginary part f(θ) of the angle dimension sum-difference ratio, plot the angle dimension single pulse ratio curve with angle as the horizontal axis and angle dimension sum-difference ratio as the vertical axis.

[0031] In one embodiment of the present invention, the step of generating a range-dimensional single-pulse ratio curve based on the ratio of the range difference beam to the sum beam includes:

[0032] Calculate the ratio of the range difference beam to the sum beam, and take the imaginary part of the resulting range dimension sum-difference ratio:

[0033]

[0034] In the formula, Im represents taking the imaginary part. Second proportionality coefficient

[0035] Based on the imaginary part f(r) of the distance dimension sum-difference ratio, plot the distance dimension single pulse ratio curve with distance as the horizontal axis and distance dimension sum-difference ratio as the vertical axis.

[0036] In one embodiment of the present invention, the step of calculating the angle dimension sum-difference ratio based on the output signal vector, the beam weight vector, and the angle difference beam weight vector, and estimating the angle of the far-field point target from the angle dimension single-pulse ratio curve, includes:

[0037] Calculate the angle dimension sum-difference ratio based on the output signal vector, beam weight vector, and angle difference beam weight vector:

[0038]

[0039] In the formula, y(θ, r) represents the output signal vector;

[0040] The ratio Y of the angle dimension single pulse ratio curve and the angle dimension sum-difference ratio is... θ The corresponding angle is determined as the angle of the far-field point target.

[0041] In one embodiment of the present invention, the step of calculating the range dimension sum-difference ratio based on the output signal vector, the beam weight vector, and the range difference beam weight vector, and estimating the distance of a far-field point target from the range dimension single-pulse ratio curve, includes:

[0042] Based on the output signal vector, beam weight vector, and range difference beam weight vector, calculate the range dimension sum-difference ratio:

[0043]

[0044] In the formula, y(θ,r) represents the output signal vector;

[0045] The distance dimension single pulse ratio curve and the distance dimension sum difference ratio Y are used to calculate the distance dimension single pulse ratio curve. r The corresponding distance is determined as the distance to the far-field target.

[0046] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0047] This invention provides a method for joint angle-range parameter estimation based on a novel radar system. Utilizing the range-angle correlation of a space-time coded array radar, a three-channel sum-difference beam is formed: a sum beam, an angle difference beam, and a range difference beam. The single-pulse ratio curves for the angle and range dimensions are calculated, thereby enabling the measurement of target angle and range information. By employing a novel waveform diversity radar system using a space-time coded array, a time delay difference is introduced between adjacent transmitting elements, which not only improves the accuracy of target localization but also enables the measurement of target range, and is easier to implement in engineering.

[0048] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of a MIMO-STCA radar provided in an embodiment of the present invention;

[0050] Figure 2 This is a flowchart of an angle-range joint parameter estimation method based on a new radar system provided in an embodiment of the present invention;

[0051] Figure 3 This is an angular direction map provided in an embodiment of the present invention;

[0052] Figure 4 This is an angular dimension single pulse ratio curve provided in an embodiment of the present invention;

[0053] Figure 5 This is a directional orientation map provided in an embodiment of the present invention;

[0054] Figure 6This is a directional single-pulse ratio curve provided in an embodiment of the present invention. Detailed Implementation

[0055] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto.

[0056] Figure 1 This is a schematic diagram of a MIMO-STCA radar provided in an embodiment of the present invention. Figure 2 This is a flowchart of an angle-range joint parameter estimation method based on a new radar system provided in an embodiment of the present invention. Please refer to [link / reference]. Figure 1-2 This invention provides an angle-range joint parameter estimation method based on a new radar system, applied to MIMO-STCA radar, including:

[0057] S1. After receiving the echo signal reflected from the far-field point target, the echo signal is sequentially down-converted, digitally mixed, and matched filtered to obtain the output signal vector.

[0058] S2. Calculate the sum beam weight vector, angle difference beam weight vector, and range difference beam weight vector, and weight the array data in the output signal vector respectively to obtain the sum and difference beam; the sum and difference beam includes: sum beam, angle difference beam, and range difference beam;

[0059] S3. Based on the sum and difference beams, generate the angle-dimensional single pulse ratio curve and the range-dimensional single pulse ratio curve, respectively;

[0060] S4. Calculate the angle dimension sum-difference ratio based on the output signal vector, beam weight vector, and angle difference beam weight vector, and estimate the angle of the far-field point target from the angle dimension single pulse ratio curve.

[0061] S5. Calculate the range dimension sum-difference ratio based on the output signal vector, beam weight vector, and range difference beam weight vector, and estimate the distance to the far-field point target from the range dimension single-pulse ratio curve.

[0062] Space-time coded array radar is a new type of waveform diversity radar. Its principle model is based on an equidistant uniform linear array, with a fixed time delay introduced between adjacent transmitting array elements. This time delay is much smaller than the pulse duration. Each transmitting array element can achieve orthogonality of the transmitted signals between array elements by transmitting orthogonal coded frequency modulation signals at different times.

[0063] This embodiment combines STCA (Space-Time Coding Array) with MIMO (Multi-User Multiple-Input Multiple-Output) technology to separate transmitted waveforms from different transmitting array elements at the receiver, obtaining a transmission steering vector related to the range angle. This provides an additional degree of freedom in the range dimension, enabling the measurement of target range parameters. Simultaneously, array weighting allows the radar sum and difference beams to form a spatial gain null at the signal incident angle, suppressing and eliminating interference and improving measurement accuracy.

[0064] Specifically, in this embodiment, the MIMO-STCA radar is a co-located MIMO radar system consisting of M identical omnidirectional transmitting array elements and N identical omnidirectional receiving array elements. Both the transmitting and receiving arrays are uniformly spaced linear arrays with an element spacing of half a wavelength. The M transmitting array elements transmit orthogonal linear frequency modulated signals, and a relative time delay Δt is introduced between each adjacent transmitting array element.

[0065] like Figure 1 As shown, the application scenario of this invention is the transmission of orthogonal space-time coded signals by a one-dimensional equidistant linear array. The orthogonal signal transmitted by the m-th transmitting element is... in, Let g(t) represent an orthogonal signal and g(t) represent a linear frequency modulated signal. Then the following relationship holds:

[0066]

[0067]

[0068] Among them, the pulse gate function T p The pulse width of the transmitted signal is represented by μ, where B represents the bandwidth of the transmitted signal, and μ = B / T. p This represents the modulation frequency of a linear frequency modulated signal. Then, according to... And g(t) can be used to solve for c m (t).

[0069] For example, by defining the first transmitting element on the left as the reference element and introducing a time delay Δt between adjacent transmitting elements, the signal s transmitted by the m-th (m = 1, 2, ..., M) element after the time delay can be obtained. m (t):

[0070]

[0071] Where f0 is the carrier frequency of the transmitted signal, then the superimposed signal S of the MIMO-STCA radar in space... T (t,θ) is:

[0072]

[0073] Where λ=c / f0 represents the wavelength, and d=λ / 2 is the spacing between adjacent array elements, the phase difference between two adjacent transmitting array elements can be obtained from the above formula. for:

[0074]

[0075] A far-field point target receives the combined transmitted signal from the MIMO-STCA radar array and reflects the echo. If the angle of the far-field point target P is θ and the distance is r, then the signal from the MIMO-STCA radar reaching the far-field point target can be expressed as:

[0076]

[0077] Where τ0=2r / c represents the two-way propagation delay between the far-field point target and the array.

[0078] Furthermore, after the radar transmitted signal reaches the far-field point target P, the echo signal reaching the nth (n = 1, 2, ..., N) receiving element after reflection from the far-field point target P is:

[0079]

[0080] The phase difference between two adjacent receiving array elements can be derived from the above formula. for:

[0081]

[0082] After receiving the echo signal at the MIMO-STCA radar receiver, the echo signal undergoes down-conversion, digital mixing, and matched filtering to obtain the output signal vector. Specifically,

[0083] Down-convert the echo signal (i.e., multiply by) This can be represented as:

[0084]

[0085] in, For complex envelope.

[0086] Next, for the echo signal received by each receiving element of the MIMO-STCA radar, digital mixing and matched filtering are performed using an M-dimensional filter. For example, the digital mixing of the echo signal of each receiving element with respect to Δt can be expressed as follows:

[0087]

[0088] Furthermore, the matched filter designed for the m-th transmitted waveform is as follows: The output of the echo signal from the nth receiving element after passing through the m-th dimension filter. Represented as:

[0089]

[0090] In the formula, * represents the convolution operation, and (·) * This indicates the conjugate operation.

[0091] because The above output signal satisfies the orthogonality condition. This can be further expressed as:

[0092]

[0093] The output y of the echo signal received by the nth receiving element after passing through an M-dimensional matched filter. n (t,θ) is:

[0094]

[0095] in,(•) T This indicates the transpose operation.

[0096] Finally, the output signal vector y of the echo signals from the N receiving array elements after passing through an M-dimensional matched filter can be represented as an MN×1-dimensional column vector output, with the following specific form:

[0097]

[0098] in, For the Kronecker product operation, b(θ) is the receive steering vector, and a(r,θ) is the transmit steering vector:

[0099]

[0100] It can be seen that for MIMO-STCA radar, its receiving steering vector is only related to the angle of the far-field point target, while its transmitting steering vector is a two-dimensional function of the distance and angle of the far-field point target. Compared with traditional phased array radar, it has an additional range dimension of freedom.

[0101] In step S2, the radar beam pointing is denoted as (θ0, r0). Different weight vectors are used to weight the array data in the output signal vector to output the sum and difference beams. Optionally, the sum beam weight vector, angle difference beam weight vector, and range difference beam weight vector in the output signal vector are calculated according to the following formulas:

[0102]

[0103]

[0104]

[0105] In the formula, r0 represents the radar range pointing, θ0 represents the radar angle pointing, a(r0,θ0) represents the transmit steering vector, and b(θ0) represents the receive steering vector. The Kronecker product, w θΔ = [1,1,…,-1,-1,…,-1] H H represents the conjugate transpose, ⊙ represents the Hadamard product, and a θ (θ0) represents the launch angle steering vector, a r (r0,μΔt) represents the transmit range steering vector, μ represents the modulation slope, Δt represents the time delay between adjacent transmit elements, and w rΔ = [1,-1,…,1,-1,…,1,-1] H .

[0106] Furthermore, the beam is represented as:

[0107]

[0108] Angle difference beamforming is represented as:

[0109]

[0110] Range difference beam is represented as:

[0111]

[0112] In the formula, v(θ,r,μΔt) represents the array data of the output signal vector, θ represents the target angle, r represents the target distance, M and N represent the number of transmitting and receiving array elements of the MIMO-STCA radar, respectively, d represents the array element spacing, λ represents the wavelength, j represents the imaginary unit, and c represents the speed of light.

[0113] Step S3, which involves generating angular dimension monopulse ratio curves and range dimension monopulse ratio curves based on sum and difference beams, includes:

[0114] S301. Based on the ratio of the angle difference beam to the sum beam, generate the angle-dimensional single-pulse ratio curve;

[0115] S302. Based on the ratio of the range difference beam to the sum beam, generate a range-dimensional single-pulse ratio curve.

[0116] Specifically, in step S301, the step of generating an angle-dimensional single-pulse ratio curve based on the ratio of the angle difference beam to the sum beam includes:

[0117] Calculate the ratio of the angle difference beam to the sum beam, and take the imaginary part of the obtained angle difference ratio:

[0118]

[0119] In the formula, Im represents the imaginary part, and the first proportionality coefficient.

[0120] Plot the angle dimension single pulse ratio curve with angle as the horizontal axis and angle dimension sum-difference ratio as the vertical axis based on the imaginary part f(θ) of the angle dimension sum-difference ratio.

[0121] It should be noted that the ratio of the angle difference beam to the sum beam is:

[0122]

[0123] The deviation angle is Δθ = θ - θ0. Considering that far-field point targets are usually located within the 3dB main lobe beam, Δθ is very small, so the above equation can be further simplified to:

[0124]

[0125] Similarly, step S302, the step of generating the range-dimensional single-pulse ratio curve based on the ratio of the range difference beam to the sum beam, includes:

[0126] Calculate the ratio of the range difference beam to the sum beam, and take the imaginary part of the resulting range difference ratio:

[0127]

[0128] In the formula, Im represents taking the imaginary part. Second proportionality coefficient

[0129] Based on the imaginary part f(r) of the distance dimension sum-difference ratio, plot the distance dimension single pulse ratio curve with distance as the horizontal axis and distance dimension sum-difference ratio as the vertical axis.

[0130] Optionally, the ratio of the range difference beam to the sum beam in this step is:

[0131]

[0132] Since the number of transmit array elements M of the MIMO-STCA radar is even, the above formula can be further simplified to:

[0133]

[0134] Optionally, step S4, which involves calculating the angle dimension sum-difference ratio based on the output signal vector, the beam weight vector, and the angle difference beam weight vector, and estimating the angle of the far-field point target from the angle dimension single-pulse ratio curve, includes:

[0135] S401. Calculate the angle dimension sum-difference ratio based on the output signal vector, beam weight vector, and angle difference beam weight vector:

[0136]

[0137] In the formula, y(θ,r) represents the output signal vector;

[0138] S402, the angle dimension single pulse ratio curve and the angle dimension sum-difference ratio Y θ The corresponding angle is determined as the angle of the far-field point target.

[0139] Further, step S5, which involves calculating the range dimension sum-difference ratio based on the output signal vector, the beam weight vector, and the range difference beam weight vector, and estimating the distance to the far-field point target from the range dimension single-pulse ratio curve, includes:

[0140] S501. Calculate the range dimension sum-difference ratio based on the output signal vector, beam weight vector, and range difference beam weight vector:

[0141]

[0142] In the formula, y(θ, r) represents the output signal vector;

[0143] S502, the distance dimension single pulse ratio curve and the distance dimension sum-difference ratio Y r The corresponding distance is determined as the distance to the far-field target.

[0144] The following simulation experiment further illustrates the angle-range joint parameter estimation method based on the new radar system provided by this invention.

[0145] The simulation uses a one-dimensional uniformly spaced linear array, horizontally placed, with an element spacing of half a wavelength. The number of transmitting elements is M = 8, and the number of receiving elements is N = 8. The MIMO-STCA radar array transmits orthogonal linear frequency modulated signals with a time delay difference Δt = 10 ns and a modulation slope μ = 10. 11 Signal bandwidth B = 1MHz, pulse width T p =10μs, carrier frequency f0=3GHz, wavelength λ=0.1m, element spacing d=0.05m, beam pointing θ=5°, R=400km, the simulation parameters are shown in Table 1:

[0146] Table 1 Simulation parameters of MIMO-STCA radar system

[0147] parameter numerical values parameter numerical values Number of launch array elements 8 Number of receiving array elements 8 Delay difference / ns 10 Modulation slope <![CDATA[10 11 ]]> Transmit signal bandwidth / MHz 1 Transmitted signal pulse width / μs 10 Carrier frequency / GHz 3 wavelength / m 0.1 Array element spacing / m 0.05 Signal-to-noise ratio (dB) 5

[0148] Simulation 1

[0149] Under the above simulation parameters, the angle of a far-field point target is estimated using the angle-range joint parameter estimation method based on the new radar system provided by this invention.

[0150] Specifically, the angle of a far-field point target is measured using sum beam and angle difference beam, resulting in an angle-dimensional radiation pattern and an angle-dimensional monopulse ratio curve, as shown below. Figure 3 and Figure 4 As shown. From Figure 3 It can be seen that the angle difference beam forms a null notch of approximately -35dB near the beam pointing angle, which effectively suppresses interference, making the resulting single-pulse ratio curve nearly a straight line in the range near the target angle, thus maintaining good measurement performance. From Figure 4 As can be seen, the single-pulse ratio curve is a curve that is close to a straight line. By calculating the angle dimension received data ratio, the angle estimate of the target can be obtained by referring to this curve.

[0151] Simulation 2

[0152] Under the above simulation parameters, the distance to a far-field point target is estimated using the angle-range joint parameter estimation method based on the new radar system provided by this invention.

[0153] Specifically, the range of a far-field point target is measured using sum-beam and angle difference beam, yielding a range-dimensional radiation pattern and a range-dimensional monopulse ratio curve, as shown below. Figure 5 and Figure 6 As shown. From Figure 5 It can be seen that the range difference beam forms a null notch of approximately -35dB near the beam pointing angle, which effectively suppresses interference, making the resulting single-pulse ratio curve nearly a straight line in the range near the target distance, thus maintaining good measurement performance. From Figure 6 As can be seen, the single-pulse ratio curve is a curve that is close to a straight line. By calculating the range dimension received data ratio, the target's range estimate can be obtained by referring to this curve.

[0154] As can be seen from the above embodiments, the beneficial effects of the present invention are as follows:

[0155] This invention provides a method for joint angle-range parameter estimation based on a novel radar system. Utilizing the range-angle correlation of a space-time coded array radar, a three-channel sum-difference beam is formed: a sum beam, an angle difference beam, and a range difference beam. The single-pulse ratio curves for the angle and range dimensions are calculated, thereby enabling the measurement of target angle and range information. By employing a novel waveform diversity radar system using a space-time coded array, a time delay difference is introduced between adjacent transmitting elements, which not only improves the accuracy of target localization but also enables the measurement of target range, and is easier to implement in engineering.

[0156] In the description of this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0157] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A method for estimating angle-range joint parameters based on a new radar system, characterized in that, Applications in MIMO-STCA radar include: After receiving the echo signal reflected from the far-field point target, the echo signal is sequentially down-converted, digitally mixed, and matched filtered to obtain the output signal vector; The sum beam weight vector, angle difference beam weight vector, and range difference beam weight vector are calculated, and the array data in the output signal vector are weighted respectively to obtain the sum and difference beam; the sum and difference beam includes: sum beam, angle difference beam, and range difference beam; Based on the sum and difference beams, angular dimension single pulse ratio curves and range dimension single pulse ratio curves are generated respectively; Based on the output signal vector, beam weight vector, and angle difference beam weight vector, calculate the angle dimension sum-difference ratio, and estimate the angle of the far-field point target from the angle dimension single pulse ratio curve; Based on the output signal vector, beam weight vector, and range difference beam weight vector, the range dimension sum-difference ratio is calculated, and the range of the far-field point target is estimated from the range dimension single-pulse ratio curve.

2. The angle-range joint parameter estimation method based on the new radar system according to claim 1, characterized in that, Calculate the beam weight vector, angle difference beam weight vector, and range difference beam weight vector respectively using the following formulas: In the formula, r0 represents the radar range pointing, θ0 represents the radar angle pointing, a(r0,θ0) represents the transmit steering vector, and b(θ0) represents the receive steering vector. The Kronecker product, w θΔ = [1,1,…,-1,-1,…,-1] H H represents the conjugate transpose, ⊙ represents the Hadamard product, and a θ (θ0) represents the launch angle steering vector, a r (r0,μΔt) represents the transmit range steering vector, μ represents the modulation slope, Δt represents the time delay between adjacent transmit elements, and w rΔ = [1,-1,…,1,-1,…,1,-1] H .

3. The angle-range joint parameter estimation method based on the new radar system according to claim 2, characterized in that, The beam is represented as follows: The angle difference beam is represented as: The range difference beam is represented as follows: In the formula, v(θ,r,μΔt) represents the array data of the output signal vector, θ represents the target angle, r represents the target distance, M and N represent the number of transmitting array elements and the number of receiving array elements of the MIMO-STCA radar, respectively, d represents the array element spacing, λ represents the wavelength, j represents the imaginary unit, and c represents the speed of light.

4. The angle-range joint parameter estimation method based on the new radar system according to claim 3, characterized in that, The steps of generating angular dimension monopulse ratio curves and range dimension monopulse ratio curves based on the sum and difference beams include: An angle-dimensional single-pulse ratio curve is generated based on the ratio of the angle difference beam to the sum beam. A range-dimensional single-pulse ratio curve is generated based on the ratio of the range difference beam to the sum beam.

5. The angle-range joint parameter estimation method based on the new radar system according to claim 4, characterized in that, The step of generating an angular-dimensional single-pulse ratio curve based on the ratio of the angle difference beam to the sum beam includes: Calculate the ratio of the angle difference beam to the sum beam, and take the imaginary part of the obtained angle difference ratio: In the formula, Im represents the imaginary part, and the first proportionality coefficient. Based on the imaginary part f(θ) of the angle dimension sum-difference ratio, plot the angle dimension single pulse ratio curve with angle as the horizontal axis and angle dimension sum-difference ratio as the vertical axis.

6. The angle-range joint parameter estimation method based on the new radar system according to claim 4, characterized in that, The step of generating a range-dimensional single-pulse ratio curve based on the ratio of the range difference beam to the sum beam includes: Calculate the ratio of the range difference beam to the sum beam, and take the imaginary part of the resulting range dimension sum-difference ratio: In the formula, Im represents taking the imaginary part. Second proportionality coefficient Based on the imaginary part f(r) of the distance dimension sum-difference ratio, plot the distance dimension single pulse ratio curve with distance as the horizontal axis and distance dimension sum-difference ratio as the vertical axis.

7. The angle-range joint parameter estimation method based on the new radar system according to claim 4, characterized in that, The steps of calculating the angle dimension sum-difference ratio based on the output signal vector, beam weight vector, and angle difference beam weight vector, and estimating the angle of the far-field point target from the angle dimension single-pulse ratio curve, include: Calculate the angle dimension sum-difference ratio based on the output signal vector, beam weight vector, and angle difference beam weight vector: In the formula, y(θ, r) represents the output signal vector; The ratio Y of the angle dimension single pulse ratio curve and the angle dimension sum-difference ratio is... θ The corresponding angle is determined as the angle of the far-field point target.

8. The angle-range joint parameter estimation method based on the new radar system according to claim 4, characterized in that, The steps of calculating the range dimension sum-difference ratio based on the output signal vector, beam weight vector, and range difference beam weight vector, and estimating the distance to a far-field point target from the range dimension single-pulse ratio curve, include: Based on the output signal vector, beam weight vector, and range difference beam weight vector, calculate the range dimension sum-difference ratio: In the formula, y(θ, r) represents the output signal vector; The distance dimension single pulse ratio curve and the distance dimension sum difference ratio Y are used to calculate the distance dimension single pulse ratio curve. r The corresponding distance is determined as the distance to the far-field target.

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