Radar system integrating TWS and TAS modes and its time resource scheduling method

Abstract

The present invention discloses a radar system integrating TWS and TAS modes and a time resource scheduling method thereof, which realizes the reasonable scheduling of radar time resources to adapt to targets of different threat levels. The method includes: turning on the radar, setting the threat threshold, entering the dynamic TWS mode by default, performing 360° horizontal mechanical scanning, pitching 0‑N° electronic scanning, and recording the threat value of targets in all directions in real time; comparing the threat value with the preset threshold in real time, and entering the transient TWS mode, dynamic TAS mode or transient TAS mode after making a decision according to the different threat values; recording and comparing the threat values ​​of targets in all directions in real time under different working modes; and reselecting different working modes after making a decision according to different threat values. The present invention improves the radar resource utilization and adaptability by adjusting the configuration of the turntable state dimension phased array beam, thereby improving the performance of the radar system in target detection and tracking in complex environments.

Description

Technical Field

[0001] The present invention relates to the field of radar technology, and in particular to a radar system integrating TWS and TAS modes and a time resource scheduling method thereof. Background Art

[0002] Traditional mechanical scanning phased array radars usually use Track-While-Scan (TWS) technology. However, phased array antennas have the characteristics of flexible allocation of radar resources and the beam can point to any position at any time without inertia. Search and Track (TAS) technology can be used to search and track the beam in a way of allocating time resources. The tracking and search beams in TAS mode are completely independent, giving full play to the high-precision search characteristics brought by the beam agility of the phased array antenna.

[0003] In TAS mode, the radar uses part of its time and beam resources to illuminate the discovered targets that need to be tracked. When a large number of targets are required to be tracked simultaneously, TAS will occupy more radar resources. Therefore, when considering tracking capacity, if there is no requirement for higher accuracy, the TWS mode is generally used. If a traditional single-sided phased array radar needs to cover a larger scanning and tracking range, it must rely on a turntable to assist the phased array in all-round scanning. The TWS mode is generally used to ensure tracking capacity. When the TWS and TAS modes are to be integrated, a four-sided phased array is usually required, which is more expensive. Summary of the invention

[0004] The object of the present invention is to provide a radar system integrating TWS and TAS modes.

[0005] The technical solution for achieving the purpose of the present invention is: a radar system integrating TWS and TAS modes, including a single-sided two-dimensional phased array radar system, a turntable and a command and control system. The single-sided two-dimensional phased array radar system is arranged on the turntable to achieve 360° azimuth rotation through the turntable; the single-sided two-dimensional phased array radar system includes a two-dimensional phased array antenna, up and down frequency conversion channels, and a signal processing system. The two-dimensional phased array antenna receives a signal and sends the signal to the up and down frequency conversion channel. The signal is processed by the up and down frequency conversion channel and sent to the signal processing system. The signal processing system sends the target information to the command and control system.

[0006] The present invention also proposes a time resource scheduling method for a radar system integrating TWS and TAS modes, and the specific implementation steps are as follows:

[0007] The radar is turned on and initialized to set the radar threat thresholds W1, W2 and W3, where W1<W2<W3;

[0008] The radar enters the dynamic TWS mode and uses the turntable to rotate 360° to perform mechanical scanning;

[0009] By configuring the phase and amplitude of all array elements, electronic scanning of the pitch area 0-N° is achieved, and the detected target information is output to the command and control system; at this time, the search data rate is αHz, and the tracking data rate is 0, achieving target detection in the entire airspace (360° in azimuth, 0-N° in pitch).

[0010] The signal processing system calculates the target threat level Wx in real time and compares it with the radar threat level threshold. When W2≥Wx≥W1, and the operating time in this dynamic TWS mode exceeds the preset time threshold T0, it enters the transient TWS mode; when W3≥Wx≥W2, and the operating time in this dynamic TWS mode exceeds T0, it enters the dynamic TAS mode; when Wx≥W3, it directly enters the transient TAS mode; otherwise, it will maintain the original mode and continue scanning and calculating;

[0011] If the transient TWS mode is entered, the turntable stops rotating, and the phase and amplitude of all array elements are configured to scan the airspace with an azimuth of 90° and a pitch of 0-N°. The search data rate is 4αHz, the tracking data rate is 0, and the detected target information is output to the command and control system.

[0012] The signal processing system calculates the target threat level Wx in real time and compares it with the radar threat level threshold. If Wx<W1, and the operating time in this transient TWS mode exceeds the preset time threshold T0, it enters the dynamic TWS mode; if W3≥Wx≥W2, and the operating time in this transient TWS mode exceeds T0, it enters the dynamic TAS mode; if Wx≥W3, it directly enters the transient TAS mode; otherwise, it will maintain the original mode and continue scanning and calculating;

[0013] If the dynamic TAS mode is entered, the turntable stops rotating, and the phases of all array elements are configured to scan the airspace with an azimuth of 90° and an elevation of 0-N°. At this time, the radar is in a search-and-track mode, where the number of search positions is A, the number of tracking positions is B, the search data rate is βHz, the tracking data rate is δHz, and the detected target information is output to the command and control system.

[0014] The signal processing system calculates the target threat level Wx in real time and compares it with the radar threat level threshold. If Wx<W1, and the running time in this dynamic TAS mode exceeds the preset time threshold T0, it enters the dynamic TWS mode; if W2≥Wx≥W1, and the running time in this dynamic TAS mode exceeds T0; if Wx≥W3, it directly enters the transient TAS mode; otherwise, it will maintain the original mode and continue scanning and calculating;

[0015] If the transient TAS mode is entered, the turntable stops rotating, and the radar only tracks the target by configuring the phase and amplitude of all array elements, where the number of search positions is 0, the number of tracking positions is C, the search data rate is 0, the tracking data rate is εHz, and the detected target information is output to the command and control system. The signal processing system calculates the target threat level Wx in real time and compares it with the radar threat level threshold. If Wx < W1, and the running time in this transient TAS mode exceeds the preset time threshold T0, it enters the dynamic TWS mode; if W2 ≥ Wx ≥ W1, and the running time in this transient TAS mode exceeds T0, it enters the transient TWS mode; if W3 ≥ Wx ≥ W2, and the running time in this transient TAS mode exceeds T0, it enters the dynamic TAS mode; otherwise, it will maintain the original mode and continue scanning and calculating.

[0016] Compared with the prior art, the present invention has the following significant advantages: 1) The present invention achieves a balance between search and tracking requirements through a target indication method combining TWS and TAS; 2) The present invention flexibly switches the radar working mode according to the actual application scenario, thereby achieving effective allocation of data rate and improving the real-time performance of the system.

[0017] The present invention is described in further detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a flow chart of a radar system integrating TWS and TAS modes and a time resource scheduling method.

[0019] Figure 2 This is a diagram of a single-plane two-dimensional phased array radar system of the present invention.

[0020] Figure 3 It is the search wave position in dynamic TWS mode.

[0021] Figure 4 It is the search wave position in transient TWS mode.

[0022] Figure 5 It is used to search and track wave positions in dynamic TAS mode.

[0023] Figure 6 It is used to search and track the wave position in transient TAS mode. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] A radar system and time resource scheduling method integrating TWS and TAS modes, such as Figure 1 As shown, the method comprises:

[0026] Step 1: Turn on the radar, perform initialization, and set the radar threat thresholds (W1, W2, and W3);

[0027] Step 2: The radar enters the dynamic TWS mode and uses the turntable to rotate 360° in azimuth for mechanical scanning. By configuring the phase and amplitude of all array elements, electronic scanning of the pitch area 0-N° is achieved. At this time, the search data rate is αHz, and the tracking data rate is 0, which realizes target detection in the entire airspace (360° in azimuth, 0-N° in pitch), calculates the target threat level Wx in real time, and outputs the detected target information to the command and control system; after the target is found, the target's prior information is obtained, including the target's position x and velocity information v, and the speed distance threat level formula is used to calculate the threat level of a single target and the radar azimuth beam width is used as an interval to calculate the threat level of all targets within the 90° azimuth range to obtain Wx. The signal processing system determines the target threat level Wx in real time and compares it with the threat level threshold. When W2≥Wx≥W1, and the running time in this dynamic TWS mode exceeds the preset time threshold T0, it enters the transient TWS mode; when W3≥Wx≥W2, and the running time in this dynamic TWS mode exceeds T0, it enters the dynamic TAS mode; when Wx≥W3, it directly enters the transient TAS mode; otherwise, it will maintain the original mode and continue scanning and calculating;

[0028] Step 3: If the transient TAS mode is entered, the turntable stops rotating, and the phase and amplitude of all array elements are configured to scan the airspace with an azimuth of 90° and a pitch of 0-N°. The search data rate is 4αHz, the tracking data rate is 0, and the signal processing system calculates the target threat level Wx in real time. If Wx<W1, and the operating time in this transient TAS mode exceeds the preset time threshold T0, enter the dynamic TWS mode; if W3≥Wx≥W2, and the operating time in this transient TAS mode exceeds T0, enter the dynamic TAS mode; if Wx≥W3, directly enter the transient TAS mode; otherwise, maintain the original mode, and continue scanning and calculating;

[0029] Step 4: If the dynamic TAS mode is entered, the turntable stops rotating, and the phase and amplitude of all array elements are configured to scan the airspace with an azimuth of 90° and a pitch of 0-N°. At this time, it is in the search and tracking mode, where the number of search positions is A, the number of tracking positions is B, the search data rate is βHz, and the tracking data rate is δHz. The signal processing system calculates the threat value Wx in real time. If Wx<W1, and the running time in this dynamic TAS mode exceeds the preset time threshold T0, it enters the dynamic TWS mode; if W2≥Wx≥W1, and the running time in this dynamic TAS mode exceeds T0, it enters the transient TWS mode; if Wx≥W3, it directly enters the transient TAS mode; otherwise, it will maintain the original mode and continue scanning and calculating;

[0030] Step 5: If the transient TAS mode is entered, the turntable stops rotating, and the phase and amplitude of all array elements are configured to scan the airspace of 90° in azimuth and 0-N° in pitch. At this time, the radar only tracks the target. The number of search positions is 0, the number of tracking positions is C, the search data rate is 0, and the tracking data rate is εHz. The signal processing system calculates the threat value Wx in real time. If Wx < W1, and the running time in this transient TAS mode exceeds the preset time threshold T0, it enters the dynamic TWS mode; if W2 ≥ Wx ≥ W1, and the running time in this transient TAS mode exceeds T0, it enters the transient TWS mode; if W3 ≥ Wx ≥ W2, and the running time in this transient TAS mode exceeds T0, it enters the dynamic TAS mode; otherwise, it will maintain the original mode and continue scanning and calculating.

[0031] The present invention will be further described below in conjunction with the embodiments.

[0032] Release three targets in the same azimuth 0-90° and elevation 0-30° range, and set the following parameters:

[0033] The radar scanning pitch range is 0-30°, the azimuth beam width is 30°, and the elevation beam width is 6°; the target distance range is [300, 2000], and the speed range is [5, 40]; the empirical parameters of the speed distance threat formula are a=-0.02, b=1.9, c=30, T0=100s.

[0034] Step 1: Initialize the settings and set the radar threat thresholds W1, W2, and W3 to 25, 50, and 75 respectively;

[0035] Step 2: The radar enters the dynamic TWS mode and uses the turntable to rotate 360° to perform mechanical scanning. By configuring the phase of all array elements, electronic scanning of the pitch area 0-30° is achieved. The number of search wave positions is 60. The search data rate is 0.15Hz, the tracking data rate is 0, and the search wave position is as follows: Figure 3 ; Realize target detection in the entire airspace (360° in azimuth, 0-30° in elevation), and output the detected target information and its threat level Wx;

[0036] After searching for new targets 1, 2, and 3, we obtain the target's prior information, including the target's position x and velocity information v. We use the velocity distance threat degree formula W = ax + bv + c to calculate the target threat degree W. Using the radar azimuth beam width as an interval, we calculate the threat degree of all targets within the 90° azimuth range and add them together to get W. x .

[0037] The new target information found is as follows:

[0038]

[0039] The signal processing system determines the target threat level Wx in real time and compares it with the threat level threshold. When W2≥Wx≥W1, and the running time in this dynamic TWS mode exceeds the preset time threshold T0 (100s), it enters the transient TWS mode; when W3≥Wx≥W2, and the running time in this dynamic TWS mode exceeds T0 (100s), it enters the dynamic TAS mode; when Wx≥W3, it directly enters the transient TAS mode; otherwise, it will maintain the original mode and continue scanning and calculating;

[0040] If the comparison result is 50≥Wx≥25, the system enters transient TWS mode.

[0041] Step 3: If the transient TWS mode is entered, the turntable stops rotating, and the phase and amplitude of all array elements are configured to scan the airspace with an azimuth of 90° and a pitch of 0-30°. The number of search wave positions is 15, the search data rate is 0.6Hz, and the tracking data rate is 0. The search wave position is as follows: Figure 4 ; The signal processing system calculates the target threat value Wx in real time. If Wx<W1, and the operation time in this transient TWS mode exceeds T0 (100s), enter the dynamic TWS mode; if W3≥Wx≥W2, and the operation time in this transient TWS mode exceeds T0 (100s), enter the dynamic TAS mode; if Wx≥W3, directly enter the transient TAS mode; otherwise, keep the original mode, continue scanning and calculating;

[0042] Scan the airspace with an azimuth of 90° and a pitch of 0-30°, calculate the threat levels Wx of targets 1, 2, and 3, and search for new target information as shown in the following table:

[0043]

[0044] If the comparison result is 75≥Wx≥50 and the operation time in this transient TWS mode exceeds T0 (100s), the dynamic TAS mode is entered;

[0045] Step 4: If the dynamic TAS mode is entered, the turntable stops rotating and the phase of all array elements is configured to scan the airspace with an azimuth of 90° and an elevation of 0-N°. At this time, it is in the search and track mode, where the number of search positions is 10, the number of tracked positions is 5, the search data rate is 0.45Hz, the tracking data rate is 0.15Hz, and the position is Figure 5; Calculate the target threat level Wx in real time. If Wx<W1, and the running time in this dynamic TAS mode exceeds T0 (100s), enter the dynamic TWS mode; if W2≥Wx≥W1, and the running time in this dynamic TAS mode exceeds T0 (100s), enter the transient TWS mode; if Wx≥W3, directly enter the transient TAS mode; otherwise, maintain the original mode, continue scanning and calculating.

[0046] Scan the airspace with an azimuth of 90° and a pitch of 0-30°. At this time, it is in the search and track mode, calculating the threat level Wx of 1, 2, and 3 targets and outputting the target information to the command and control system;

[0047] The new target information found is as follows:

[0048]

[0049]

[0050] If the comparison result is Wx≥75, the system directly enters the transient TAS mode;

[0051] Step 5: If the transient TAS mode is entered, the turntable stops rotating, and the phase and amplitude of all array elements are configured to scan the airspace of 90° in azimuth and 0-N° in elevation. At this time, the radar only tracks the target. The number of search positions is 0, the number of tracking positions is 15, the search data rate is 0, the tracking data rate is 0.6Hz, and the position is Figure 6 The signal processing system calculates the threat level value Wx in real time. If Wx<W1, and the running time in this transient TAS mode exceeds T0 (100s), it enters the dynamic TWS mode; if W2≥Wx≥W1, and the running time in this transient TAS mode exceeds T0 (100s), it enters the transient TWS mode; if W3≥Wx≥W2, and the running time in this transient TAS mode exceeds T0 (100s), it enters the dynamic TAS mode; otherwise, it will maintain the original mode, and continue scanning and calculating.

[0052] Scan the airspace with an azimuth of 90° and a pitch of 0-30°. At this time, it is in the search and track mode, calculating the threat level Wx of 1, 2, and 3 targets and outputting the target information to the command and control system;

[0053] The new target information found is as follows:

[0054]

[0055] The comparison result is Wx<25, and the operation time in this transient TAS mode exceeds T0 (100s), and enters the dynamic TWS mode;

[0056] In the embodiment, by combining the radar TWS and TAS modes, radar resources are effectively mobilized, and the search beam position and tracking beam position can be allocated in real time according to the target threat level, and the data rate is improved.

Claims

1. A radar system integrating TWS and TAS modes, characterized in that: It includes a single-sided two-dimensional phased array radar system, a turntable and a command and control system. The single-sided two-dimensional phased array radar system is arranged on a turntable and realizes 360° azimuth rotation through the turntable. The single-sided two-dimensional phased array radar system includes a two-dimensional phased array antenna, an up and down frequency conversion channel, and a signal processing system. The two-dimensional phased array antenna receives a signal and sends the signal to the up and down frequency conversion channel. The signal is processed by the up and down frequency conversion channel and sent to the signal processing system. The signal processing system sends the target information to the command and control system. The specific implementation steps are as follows: Turn on the radar, perform initialization, and set the radar threat thresholds W1, W2, and W3, W1<W2<W3; The radar enters the dynamic TWS mode and uses the turntable to rotate 360° to perform mechanical scanning; By configuring the phase and amplitude of all array elements, electronic scanning of the pitch area 0-N° is achieved, and the detected target information and radar threat level are output to the command and control system; at this time, the search data rate is αHz and the tracking data rate is 0, achieving target detection in the entire airspace. The signal processing system calculates the target threat level Wx in real time and compares it with the radar threat level threshold. When W2≥Wx≥W1, and the operating time in this dynamic TWS mode exceeds the preset time threshold T0, it enters the transient TWS mode; when W3≥Wx≥W2, and the operating time in this dynamic TWS mode exceeds T0, it enters the dynamic TAS mode; when Wx≥W3, it directly enters the transient TAS mode; otherwise, it will maintain the original mode and continue scanning and calculating; If the transient TWS mode is entered, the turntable stops rotating, and the phase and amplitude of all array elements are configured to scan the airspace with an azimuth of 90° and a pitch of 0-N°. The search data rate is 4αHz, the tracking data rate is 0, and the detected target information and radar threat level are output to the command and control system. The signal processing system calculates the target threat level Wx in real time and compares it with the radar threat level threshold. If Wx<W1, and the operating time in this transient TWS mode exceeds the preset time threshold T0, it enters the dynamic TWS mode; if W3≥Wx≥W2, and the operating time in this transient TWS mode exceeds T0, it enters the dynamic TAS mode; if Wx≥W3, it directly enters the transient TAS mode; otherwise, it will maintain the original mode and continue scanning and calculating; If the dynamic TAS mode is entered, the turntable stops rotating, and the phases of all array elements are configured to scan the airspace with an azimuth of 90° and an elevation of 0-N°. At this time, the radar is in a search-and-track mode, where the number of search positions is A, the number of tracking positions is B, the search data rate is βHz, the tracking data rate is δHz, and the detected target information and radar threat level are output to the command and control system. The signal processing system calculates the target threat level Wx in real time and compares it with the radar threat level threshold. If Wx<W1, and the running time in this dynamic TAS mode exceeds the preset time threshold T0, it enters the dynamic TWS mode; if W2≥Wx≥W1, and the running time in this dynamic TAS mode exceeds T0; if Wx≥W3, it directly enters the transient TAS mode; otherwise, it will maintain the original mode and continue scanning and calculating; If the transient TAS mode is entered, the turntable stops rotating, and the radar only tracks the target by configuring the phase and amplitude of all array elements, where the number of search positions is 0, the number of tracking positions is C, the search data rate is 0, the tracking data rate is εHz, and the detected target information and radar threat level are output to the command and control system; the signal processing system calculates the target threat level Wx in real time and compares it with the radar threat level threshold. If Wx<W1, and the running time in this transient TAS mode exceeds the preset time threshold T0, the dynamic TWS mode is entered; if W2≥Wx≥W1, and the running time in this transient TAS mode exceeds T0, the transient TWS mode is entered; if W3≥Wx≥W2, and the running time in this transient TAS mode exceeds T0, the dynamic TAS mode is entered; otherwise, the original mode will be maintained, and scanning and calculation will continue.

2. The time resource scheduling method of the radar system integrating TWS and TAS modes according to claim 1, characterized in that: The method for calculating the target threat level Wx is as follows: after discovering the target, obtain the target's prior information, including the target's position x and speed information v, use the speed distance threat level formula to calculate the threat level of a single target, and take the target as the center and the radar azimuth beam width as the interval to calculate the threat level of all targets within the 90° azimuth range, and add up the threat levels to get the target threat level W x .

3. The time resource scheduling method of the radar system integrating TWS and TAS modes according to claim 2, characterized in that: The speed distance threat formula is as follows: W=a·x+b·v Where a and b are weight coefficients, x is the position of the target, v is the velocity information, and W is the threat level of a single target.

Images