A method for stable acquisition and tracking of high dynamic target telemetry signals of a motorized platform

Abstract

The present application relates to the field of high dynamic target acquisition tracking of motorized platform, and discloses a kind of stable acquisition tracking method of high dynamic target telemetry signal of motorized platform, the method is aimed at the problem that high dynamic target is easy to deviate from beam range under the receiving condition of motorized platform, designs phased array feed antenna, uses phased array feed antenna to guide receiving high dynamic target in the process of vehicle movement, and based on antenna group array synthesis algorithm, the optimal weighted signal synthesis of the multi-channel receiving signal of phased array feed antenna is carried out, the signal-to-noise ratio of receiving signal is improved, while ensuring the phase continuity of synthesized signal, the performance of subsequent signal acquisition detection demodulation is improved, so that the system takes into account the advantages of large field of view search acquisition and high antenna gain.

Description

Technical Field

[0001] This invention relates to the field of acquisition and tracking of high dynamic targets on mobile platforms. By employing a phased array feed antenna and an optimal synthesis method for multi-feed source received signals, the system can achieve angular acquisition and tracking of high dynamic targets in a mobile state. It is particularly suitable for applications such as search, detection and tracking of targets in the airspace. Background Technology

[0002] High-dynamic targets are characterized by high speed, thus requiring ground platforms to quickly search for and acquire them. Mobile platforms, on the other hand, need to acquire and track targets while maneuvering, placing high demands on their stability. For target search, detection, and tracking within the airspace, a balance between a large field of view and high gain is typically required. Traditional single-feed antenna systems present a trade-off between these two aspects. Phased array feed systems offer the advantages of a single feed source providing a wide beamwidth but low gain, while multiple feed sources create multiple beams covering a large field of view. Antenna gain is improved through multi-feed source signal synthesis. Compared to traditional antenna feed systems, this method achieves a large field of view scanning through multiple feed sources and high antenna gain through multi-feed source signal synthesis. Summary of the Invention

[0003] This invention discloses a stable acquisition and tracking method for telemetry signals of high-dynamic targets on a mobile platform. Addressing the issue that high-dynamic targets easily deviate from the beam range during mobile platform reception, this method designs a phased array feed antenna. The phased array feed antenna is used for guiding and receiving high-dynamic targets during vehicle maneuvering. Based on an antenna array synthesis algorithm, the multi-channel received signals from the phased array feed antenna are optimally weighted and synthesized to improve the signal-to-noise ratio of the received signal while ensuring the phase continuity of the synthesized signal. This improves the performance of subsequent signal acquisition, detection, and demodulation, enabling the system to combine the advantages of a large field of view search and acquisition with high antenna gain.

[0004] The technical solution adopted in this invention is as follows:

[0005] A method for stable acquisition and tracking of telemetry signals from high-dynamic targets on a mobile platform includes the following steps:

[0006] S1. Design a phased array feed antenna with the main feed located at the center of the array. The outer array consists of an N×N-4 phased array square array forming an offset phased array feed, creating N×N-4 closely arranged beams in space. The main feed aperture is larger than that of the offset phased array feed, and N is a natural number greater than 1.

[0007] S2, sample and preprocess the received signals from N×N-4 offset phased array feed sources, and estimate the signal-to-noise ratio of the preprocessed received signals based on the frequency domain characteristics and signal bandwidth of the frequency-modulated telemetry signal. Based on the signal-to-noise ratio estimation results, find the channel with the largest signal-to-noise ratio from the N×N-4 received signals as the reference channel.

[0008] S3, find 3 branches with the second highest signal-to-noise ratio among the 8 adjacent channels around the reference channel, and use them as channels to participate in signal synthesis;

[0009] S4, together with the received signals from the three signal synthesis channels, the reference channel signal is used to calculate the phase weighting value using the signal synthesis algorithm, and the amplitude weighting value is calculated using the maximum ratio synthesis algorithm;

[0010] S5 synthesizes the phase-weighted and amplitude-weighted values ​​of the four signals;

[0011] S6, select the one with the highest signal-to-noise ratio among the four signals participating in the synthesis as the reference channel, and synchronously update the phase weighting value to the new reference channel, then go to S3;

[0012] A stable acquisition and tracking method for telemetry signals of high-dynamic targets on a mobile platform has been developed.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] This invention discloses a stable acquisition and tracking method for telemetry signals of high-dynamic targets on mobile platforms. Based on a phased array feed antenna, it utilizes the multi-beam array formed by the phased array feed to search for targets within a large field of view. Based on a signal synthesis algorithm, it automatically achieves optimal synthesis of multi-channel received signals without prior calibration, thereby improving the signal-to-noise ratio (SNR) of the received signal. This method balances large field-of-view search and high-gain reception, making it highly suitable for the telemetry, tracking, and control of targets in battlefield airspace, improving the SNR of the received signal, and expanding the detection range and probability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the phased array feed of the present invention;

[0016] Figure 2 This is a flowchart of signal processing in a phased array feed antenna system according to the present invention. Detailed Implementation

[0017] Reference Figure 1 and Figure 2 A method for stable acquisition and tracking of telemetry signals of high-dynamic targets on a mobile platform, comprising the following steps:

[0018] ① To address the issue of high-dynamic targets easily deviating from the beam range when receiving signals from a mobile platform, a design is proposed as follows: Figure 1The phased array feed antenna shown has a large-aperture main feed located at the center of the array, and the outer array consists of an N×N-4 phased array square array forming an offset phased array feed, which can form N×N-4 closely arranged beams in space to cover a certain space, where N is a natural number greater than 1.

[0019] ② Sample and preprocess the received signals from the N×N-4 offset phased array feed sources, and directly estimate the signal-to-noise ratio (SNR) of the preprocessed received signals based on the frequency domain characteristics and signal bandwidth of the frequency-modulated telemetry signal. Based on the SNR estimation results, find the channel with the highest SNR from the N×N-4 received signals as the reference channel.

[0020] ③ To improve the signal-to-noise ratio of the received signal, three branches with the second highest signal-to-noise ratio were found among the eight adjacent channels around the reference channel and used as channels for signal synthesis.

[0021] ④ Phase weighting and amplitude weighting estimation: The reference channel signal and the received signals from the three signal synthesis channels are combined using a signal synthesis algorithm to calculate the phase weighting, and the maximum ratio synthesis algorithm is used to calculate the amplitude weighting.

[0022] ⑤ Signal synthesis: Combine the phase-weighted and amplitude-weighted values ​​of the four signals;

[0023] ⑥ Reference channel iterative update: Since the reference branch is not fixed due to target movement or antenna rotation, the reference channel is updated according to the signal-to-noise ratio estimation result. In order to ensure the phase continuity of the synthesized signal, the reference channel is not selected from all channels with the highest signal-to-noise ratio. Instead, the channel with the highest signal-to-noise ratio among the four signals participating in the synthesis is selected as the reference channel, and the phase weighting value is synchronously updated to the new reference channel. Proceed to step ③.

[0024] A stable acquisition and tracking method for telemetry signals of high-dynamic targets on a mobile platform has been developed.

Claims

1. A method for stable acquisition and tracking of telemetry signals from high-dynamic targets on a mobile platform, characterized in that, Includes the following steps: S1. Design a phased array feed antenna with the main feed located at the center of the array. The outer array consists of an N×N-4 phased array square array forming an offset phased array feed, creating N×N-4 closely arranged beams in space. The main feed aperture is larger than that of the offset phased array feed, and N is a natural number. S2, sample and preprocess the received signals from N×N-4 offset phased array feed sources, and estimate the signal-to-noise ratio of the preprocessed received signals based on the frequency domain characteristics and signal bandwidth of the frequency-modulated telemetry signal. Based on the signal-to-noise ratio estimation results, find the channel with the largest signal-to-noise ratio from the N×N-4 received signals as the reference channel. S3, find 3 branches with the second highest signal-to-noise ratio among the 8 adjacent channels around the reference channel, and use them as channels to participate in signal synthesis; S4, together with the received signals from the three signal synthesis channels, the reference channel signal is used to calculate the phase weighting value using the signal synthesis algorithm, and the maximum ratio synthesis algorithm is used to calculate the amplitude weighting value. S5 synthesizes the phase-weighted and amplitude-weighted values ​​of the four signals; S6, select the one with the highest signal-to-noise ratio among the four signals participating in the synthesis as the reference channel, and synchronously update the phase weighting value to the new reference channel, then go to S3; A stable acquisition and tracking method for telemetry signals of high-dynamic targets on a mobile platform has been developed.

Images