CN212301858U - Radar signal simulator with working frequency band of 6-18GHz - Google Patents

Abstract

The utility model discloses a radar signal simulator that operating frequency is 6-18GHz, including host computer control unit, host computer unit and antenna unit: the host unit comprises a DDS module, a microwave frequency conversion module and a power amplification module; the DDS module receives and comes from the signal instruction that upper computer control unit sent after, the DDS produces 400 of various frequency channels, modulation mode and repetition frequency pulse width and supplyes 600MHz intermediate frequency signal, and the microwave frequency conversion module is with 400 supplyes 600MHz 'intermediate frequency signal amplification processing for corresponding 6-18 GHz's signal with it, and antenna unit sends out the analog signal of 6-18GHz frequency channel, the utility model discloses expanded the signal workable frequency channel of radar signal simulator, enriched various modulation signal, can be used to in the radar signal simulation.

Description

Radar signal simulator with working frequency band of 6-18GHz

Technical Field

The utility model relates to a signal simulator, in particular to radar signal simulator with a working frequency band of 6-18 GHz.

Background

With the development of electronic information technology at home and abroad, the working frequency band, signal style, modulation method and the like of radars at home and abroad have been greatly developed, and the electromagnetic environment also tends to the more complicated current situation of a non-Gaussian noise model and the like. The simulation of traditional radar signals is mainly a hardware-generated signal and software-controlled method. Software control signals often generate single signal systems and cannot control complex signal modulation modes, and signals produced by existing hardware have the characteristics of narrow bandwidth, few signal patterns, poor anti-interference performance and serious attenuation, so that the existing radar signal simulator cannot keep pace with the rapid development of radar technology, lacks authenticity and cannot meet the simulation requirements of the existing radars at home and abroad.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a radar signal simulator that the frequency band of operation is 6-18GHz, it is narrow to solve traditional radar signal simulator frequency band bandwidth of working.

The purpose of the utility model is realized like this: a radar signal simulator with an operating frequency band of 6-18GHz comprises:

the upper computer control unit is used for sending an instruction to the host computer unit and controlling the host computer unit to generate a signal;

the host unit is used for generating a signal after obtaining a control instruction sent by the upper computer control unit;

the antenna unit is used for sending the signal;

the host unit comprises a DDS module, a microwave frequency conversion module and a power amplification module; after the DDS module receives a signal instruction sent by the upper computer control unit, the DDS module generates 400-plus-600 MHz intermediate frequency signals of various frequency ranges, modulation modes and repetition frequency pulse widths, the microwave frequency conversion module amplifies the 400-plus-600 MHz intermediate frequency signals and processes the signals into corresponding 6-18GHz signals, and the antenna unit sends out the analog signals of the 6-18GHz frequency ranges.

As a further limitation of the present invention, the microwave frequency conversion module includes a radio frequency amplification module, a vibration starting module, a mixing switching module and an intermediate frequency output module; the radio frequency signal is subjected to single-stage amplification through the radio frequency amplification module so as to output a radio frequency amplification signal which can be matched with the oscillation starting module in the frequency mixing switching module for frequency mixing, and the radio frequency amplification signal is output through the intermediate frequency output module.

As a further limitation of the present invention, the antenna unit employs a transmitting antenna of 6-18GHz band, and the width of the main lobe of the antenna is 30 ° × 30 °.

Compared with the prior art, the beneficial effects of the utility model reside in that: through the utility model discloses a modular design scheme has expanded radar signal simulator's signal frequency channel of working, has richened various modulation signal.

Drawings

Fig. 1 is a block diagram of the system of the present invention.

Fig. 2 is the system work flow chart of the present invention.

Detailed Description

Fig. 1 shows a radar signal simulator with an operating frequency band of 6-18GHz, which includes an upper computer control unit 1, a host unit 2 and an antenna unit 6, wherein the host unit 2 includes: a DDS module 3, a microwave frequency conversion module 4 and a power amplification module 5.

As shown in fig. 2, a user inputs various upper computer control commands 7 such as frequency, repetition frequency, pulse width and the like of signals through an operation interface of the upper computer unit; the control instruction 7 is transmitted to the DDS module to synthesize the DDS-synthesized intermediate frequency signal 8, the DDS transmits the received instruction to the pulse description control word resolving module for parameter settlement, then transmits settlement data to the pulse description control word time sequence queuing module for time permission queuing, then transmits the settlement data to the pulse description control word output control module, and finally outputs the 400-plus-600 MHz intermediate frequency signal of the corresponding instruction parameter; after the intermediate frequency signal is subjected to microwave frequency conversion 9 through a microwave frequency conversion module, the intermediate frequency signal is subjected to frequency conversion through a corresponding frequency control word to obtain an analog signal of 6-18 GHz; because the signal power after microwave frequency conversion is low, the signal is seriously attenuated after passing through different radio frequency lines, so that the normal transmitting signal cannot be ensured to influence the receiving of the signal at the same time, the signal is transmitted to a power amplification module for power amplification 10, and the final signal is transmitted to a transmitting antenna for transmitting a signal 11; and the transmitting antenna also has a signal gain function, and finally the effective radiation power of the transmitting signal can be more than 48 dBm.

A DDS module 3: outputting information sources such as frequency, pulse width, repetition frequency, power and the like of the radio frequency signal, wherein the main working process is channel control and a frequency source; because modern radar signals put forward high requirements on frequency precision, frequency setting time and signal patterns and simultaneously require a system to make quick response, the direct digital frequency synthesis of a DDS module 3 is adopted in the invention; therefore, the parallel flow-out structure of the FPGA is fully utilized, after instruction information of an upper computer is received, each pulse description control word settlement module in the FPGA works independently, a resolving result is output to a time sequence queuing module for time-delay queuing and pulse loss processing, and finally the signal is formed; and the DDS module 3 has the characteristics of low power consumption, high resolution and low time delay, and can accurately realize the stepping of fine frequency, thereby being capable of mixing and filtering and finally generating the intermediate frequency signal of 400-plus-600 MHz meeting the system requirement.

The microwave frequency conversion module 4 comprises a radio frequency amplification module, an oscillation starting module, a frequency mixing switching module and an intermediate frequency output module; the radio frequency amplification module amplifies the radio frequency signal received by the antenna to generate a radio frequency amplified signal; the oscillation starting module generates a local oscillation signal; the frequency mixing switching module performs multi-phase digital phase modulation according to the local oscillator signal and the radio frequency amplification signal to generate a local oscillator frequency signal, and performs frequency mixing according to the local oscillator frequency signal and the radio frequency amplification signal to generate various intermediate frequency signals; the intermediate frequency output module outputs an intermediate frequency signal; the microwave frequency conversion module 4 performs single-stage amplification on the radio frequency signal through the radio frequency amplification module to output a radio frequency amplification signal which can be matched with the mixing switching module, so that the circuit has a simple structure, and a large amount of cost is saved on the premise of ensuring high performance; in this embodiment, the microwave frequency conversion module 4 generates an intermediate frequency signal of 400-600MHz to the DDS module, and performs frequency conversion processing on the intermediate frequency signal to obtain a corresponding signal in the 6-18GHz band.

The power amplification module 5: in the radio frequency transceiving system of the embodiment, the performance of the power amplification module 5 plays an important role in the communication quality and the propagation distance of the whole system; the power amplification module 5 in the transmission link performs power amplification on the modulated signal to ensure a longer communication distance.

The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some replacements and transformations for some technical features without creative labor according to the disclosed technical contents, and these replacements and transformations are all within the protection scope of the present invention.

Claims (3)

1. A radar signal simulator with an operating frequency band of 6-18GHz comprises: the upper computer control unit is used for sending an instruction to the host computer unit and controlling the host computer unit to generate a signal; the host unit is used for generating a signal after obtaining a control instruction sent by the upper computer control unit; the antenna unit is used for sending the signal; the method is characterized in that: the host unit comprises a DDS module, a microwave frequency conversion module and a power amplification module; after the DDS module receives a signal instruction sent by the upper computer control unit, the DDS module generates 400-plus-600 MHz intermediate frequency signals of various frequency ranges, modulation modes and repetition frequency pulse widths, the microwave frequency conversion module amplifies the 400-plus-600 MHz intermediate frequency signals and processes the signals into corresponding 6-18GHz signals, and the antenna unit sends out the analog signals of the 6-18GHz frequency ranges.

2. The radar signal simulator with the operating frequency band of 6-18GHz according to claim 1, wherein the microwave frequency conversion module comprises a radio frequency amplification module, a vibration starting module, a frequency mixing switching module and an intermediate frequency output module; the radio frequency signal is subjected to single-stage amplification through the radio frequency amplification module so as to output a radio frequency amplification signal which can be matched with the oscillation starting module in the frequency mixing switching module for frequency mixing, and the radio frequency amplification signal is output through the intermediate frequency output module.

3. The radar signal simulator of claim 1 or 2, wherein the antenna unit is a transmitting antenna of 6-18GHz band, and the width of the antenna main lobe is 30 ° × 30 °.

Images