CN215340295U

CN215340295U - Multichannel radar responder based on frequency spectrum regeneration technology

Info

Publication number: CN215340295U
Application number: CN202120620180.9U
Authority: CN
Inventors: 王文林; 胡宗新
Original assignee: Chengdu Baotong Tianyu Electronic Science & Technology Co ltd
Current assignee: Chengdu Baotong Tianyu Electronic Science & Technology Co ltd
Priority date: 2021-03-26
Filing date: 2021-03-26
Publication date: 2021-12-28
Anticipated expiration: 2031-03-26

Abstract

The utility model discloses a multi-channel radar responder based on a frequency spectrum regeneration technology, which comprises the following components: an antenna: the short wave antenna is composed of a short wave antenna and an installation accessory, receives a short wave signal sent by a radar transmitting station, sends the short wave signal to a receiving and transmitting module, and radiates the short wave signal sent by the receiving and transmitting module; a transceiver module: the device comprises a receiving module and a transmitting module, and is used for amplifying, frequency converting and filtering short-wave signals; the signal processing module: the system comprises a digital filter and a power amplifier, and is characterized in that a frequency spectrum regeneration technology is utilized to carry out digital processing on a received signal and transmit the processed signal to a radar main control station and a receiving module; a power supply module: providing direct current power supply for each module; a timing module: and the signal processing module is connected and used for completing time-frequency synchronization of the local clock and the BD. The utility model designs a radar responder, and purifies an input signal through a frequency spectrum regeneration technology, thereby reducing the influence of interference signals and background noise on radar signals.

Description

Multichannel radar responder based on frequency spectrum regeneration technology

Technical Field

The utility model relates to the field of transponder design, in particular to a multi-channel radar transponder based on a frequency spectrum regeneration technology.

Background

The sky wave radar system is mainly used for positioning and tracking large ships on water surface to guide and strike weapons. The system works in short wave frequency band, and is transmitted by refraction of ionosphere, and the action range of the system reaches thousands of kilometers. The sky wave over-the-horizon radar usually has a plurality of transmitting stations, and the positioning accuracy of the radar can be improved by simultaneously measuring the target through a plurality of paths of transmitting signals. In the patent application with the application number CN201620340895.8, a radar transponder and a radar response system for S-mode secondary radar test are mentioned, but are not suitable for forwarding multiple radar signals.

After the over-the-horizon radar is designed and manufactured, a large number of comparison tests are needed to evaluate the function of the radar, the conventional evaluation means is mainly carried out by detecting a cooperative target or a radar responder, and the radar responder usually completes the forwarding of radar signals in a direct forwarding mode. Generally, the short wave antenna is an omnidirectional antenna, so that the transponder forwards in a mode of transmitting and receiving time-sharing operation. The forwarded signals contain pulse modulation signals, and when the forwarding mode is used for forwarding multiple paths of radar signals, the cost is high, the anti-interference capability is poor, and the forwarding success rate is low under the condition of low signal-to-noise ratio input.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a multi-channel radar responder based on a frequency spectrum regeneration technology, and aims to solve the technical problems of high cost, poor anti-interference capability and low success rate of forwarding under the condition of low signal-to-noise ratio input caused by the fact that a radar responder usually forwards multi-channel radar signals in a direct forwarding mode in the prior art.

In order to achieve the above object, the present invention provides a multi-channel radar transponder based on a spectrum regeneration technology, wherein the transponder receives a remote control instruction sent by a radar master station, the radar master station includes a radar main control station, a radar transmitting station and a radar receiving station, and the radar transponder includes:

an antenna: the short wave antenna is composed of a short wave antenna and an installation accessory, receives a short wave signal sent by a radar transmitting station, sends the short wave signal to a receiving and transmitting module, and radiates the short wave signal sent by the receiving and transmitting module;

a transceiver module: the receiving module is used for amplifying, frequency-converting and filtering short-wave signals sent by an antenna and sending the processed signals to the signal processing module, and the transmitting module is used for amplifying, frequency-converting and filtering the signals sent by the signal processing module and sending the processed signals to the antenna;

the signal processing module: the system comprises a digital filter and a power amplifier, and is characterized in that signals sent by a receiving module and a radar master control station are digitally processed by utilizing a frequency spectrum regeneration technology, and the processed signals are transmitted to the radar master control station and the receiving module;

a power supply module: connecting the signal processing module and the transceiving module and providing a direct current power supply for the signal processing module and the transceiving module;

a timing module: and the signal processing module is connected and used for completing time-frequency synchronization of the local clock and the BD.

Preferably, the radar transponder further comprises a transceiver switch, wherein the transceiver switch is controlled by the signal processing module, connected with the receiving module and the transmitting module, and used for controlling the transceiver state of the transponder.

Preferably, the transceiver switch is an electronic switch.

Preferably, the power module comprises an AC-DC conversion module, an AC-DC switching module, a DC-DC conversion module, and a charging module.

Preferably, the power amplifier is a high linearity class a power amplifier.

Preferably, the receiving channel adopts a high-linearity and low-noise receiver for receiving multiple radar signals.

Preferably, the transponder performs multi-path radar signal forwarding by adopting a transceiving time-sharing working mode.

The utility model has the beneficial effects that: when the radar responder forwards multiple paths of radar signals, signal separation is realized in a digital filtering mode, the separated radar signals and local signals are confirmed by an algorithm of a frequency spectrum regeneration technology, so that the influence of interference signals can be reduced, and meanwhile, because of the phase random characteristic of background noise, the correlation with the local signals is very low, the algorithm of the frequency spectrum regeneration technology has a certain inhibition effect on the noise signals, so that the responder can normally work under the condition of low signal-to-noise ratio. The signal sent by the responder is a local reference signal, the signal quality is good, and the capture probability of the radar receiver can be improved. The transponder can be matched with a radar system to finish calibration of beams and system coverage areas of all stations and calibration of detection capability and positioning accuracy of the radar system. The equipment has simple structure, less equipment amount and strong maneuverability. By being arranged on different carriers, the radar power coverage area can be calibrated at any position, the detection cost is low, a conventional evaluation means system can be simplified, and the manpower, material resources and errors which need to be lost are reduced.

Drawings

FIG. 1 is a schematic block diagram of the present invention;

FIG. 2 is an algorithmic schematic of a spectral regeneration technique;

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

As shown in fig. 1, in this embodiment, a multi-channel radar transponder based on a spectrum regeneration technology, the transponder receives a remote control command sent by a radar master station, the radar master station includes a radar master station, a radar transmitting station, and a radar receiving station, and the radar transponder includes:

specifically, the transmission and reception of signals are realized in a time-sharing working mode;

specifically, the digital filter is used for filtering stray of the transmission signal;

Specifically, the radar transponder further comprises a receiving and transmitting switch, wherein the receiving and transmitting switch is controlled by the signal processing module, is connected with the receiving module and the transmitting module, and is used for controlling the receiving and transmitting states of the transponder.

Specifically, the transceiver switch is an electronic switch.

Specifically, the power supply module is composed of an AC-DC conversion module, an alternating current-direct current switching module, a DC-DC conversion module and a charging module.

Specifically, the power amplifier is a high linearity class a power amplifier.

Specifically, the receiving channel adopts a high-linearity and low-noise receiver for receiving multiple radar signals and reducing mutual interference between the signals.

Specifically, the transponder transmits multiple paths of radar signals in a receiving and transmitting time-sharing working mode.

In this embodiment, the signal processing module separates the received signal by means of a digital filter, the separated signal is correlated with a plurality of channels of reference signals generated locally, the start time of the local signal is adjusted according to the correlation result, the adjusted reference signal is restored to an analog signal by a DAC, the signal is amplified and filtered by a transmission channel, and the analog signal is radiated by an antenna.

It is added that the algorithm schematic diagram of the spectrum regeneration technology is shown in fig. 2, wherein the original signal RF1 is a chirp continuous wave signal, and RF1 has a random unknown fixed input phase and time delay; the A/D is a sampling device which samples an original signal RF1 and converts the signal from analog to digital; the LO1 module generates two paths of LFMCW signals which have the same characteristics as the radar transmitting station and are orthogonal to each other according to the parameters set by the transponder; the signal after A/D sampling is divided into two paths, namely an I path and a Q path, which are respectively mixed with the orthogonal signal generated by the LO1 module, so as to realize the orthogonal frequency conversion and the time delay calculation of the sampled signal.

After quadrature demodulation, low-pass filtering is performed on the IQ signals, the low-pass filtered IQ signals are sent to a signal processing module, the signal processing module calculates RF1 delay, and an estimation result of the delay is transmitted to an LO2 module.

In order to simulate the effect of doppler on the original signal, the doppler information module sends a doppler signal to LO 2; the LO2 synthesizes output signals RF2 and RF2 including doppler according to the delay information obtained by the detection module and the doppler signal of the doppler information module, but removes the influence of delay.

Claims

1. The utility model provides a multichannel radar transponder based on frequency spectrum regeneration technique, the remote control instruction that the transponder sent is received to radar main website, radar main website includes radar master control station, radar transmitting station and radar receiving station, its characterized in that, the radar transponder includes:

2. The multi-channel radar transponder based on spectral regeneration technology of claim 1, wherein the radar transponder further comprises a transceiver switch, controlled by the signal processing module, connected to the receiving module and the transmitting module for controlling the transceiver state of the transponder.

3. A multi-channel radar transponder according to claim 2, characterised in that the transmit-receive switch is an electronic switch.

4. The multi-channel radar transponder based on spectral regeneration technology of claim 1, wherein the power module is composed of an AC-DC conversion module, an AC-DC switching module, a DC-DC conversion module, and a charging module.

5. A multi-channel radar transponder according to claim 1 and based on spectral regeneration, wherein the power amplifier is a high linearity class a power amplifier.

6. The multi-channel radar transponder based on spectral regeneration of claim 1, wherein the receive module employs a high linearity, low noise receiver for receiving multiple radar signals.

7. A multi-channel radar transponder according to claim 1 and based on spectral regeneration, wherein the transponder is arranged to retransmit multiple radar signals by means of time-shared operation of transmitting and receiving.