CN203930045U - A kind of antenna pattern measurement device based on Full digital high-frequency radar - Google Patents

Abstract

The utility model provides an antenna pattern measuring device based on an all-digital high-frequency radar, which includes a transmitting circuit, a receiving circuit, an FPGA chip, a USB controller, and a host; the transmitting circuit includes a transmitting antenna, a transmitter, a DDS chip, and Phase-locked loop clock synthesizer, crystal oscillator circuit; receiving circuit includes receiving antenna, analog front-end, A/D conversion circuit connected in sequence; FPGA chip is connected with phase-locked loop clock synthesizer, DDS chip, transmitter, analog front-end, A/D The D conversion circuit is connected with the USB controller; the USB controller is connected with the host computer; the phase-locked loop clock synthesizer is connected with the A/D conversion circuit. The utility model has the advantages of simple circuit, small volume, low cost and high stability, and is especially suitable for detecting dynamic parameters of the ocean surface.

Description

An Antenna Pattern Measuring Device Based on All-Digital High-Frequency Radar

technical field

The utility model relates to an antenna pattern measuring device based on an all-digital high-frequency radar.

Background technique

The key to radar target detection is to accurately estimate the azimuth angle of the target through array signal processing. The accuracy of azimuth estimation largely depends on the accuracy of the actual pattern of the antenna array. Therefore, accurate measurement of the antenna pattern is of great importance for radar target detection. very important. The common array form mainly judges the direction of incoming waves by comparing the phase difference between adjacent array elements, that is, phase comparison. The measurement of the pattern of this antenna array needs to use the phase difference information, which is realized by transponders in practical applications. In the patent named: High Frequency Ground Wave Radar Transponder, Patent No.: 03235739.7, Wuhan University introduced the design of the transponder, which can realize the following functions by generating a delay signal that is completely coherent with the radar transmitted signal : One is to provide a reference signal for the amplitude and phase correction of the multi-channel radar receiver, the other is to provide a stable signal source for the near-field measurement radar transmitting antenna pattern, and the third is to provide a calibration signal for the wide-wave velocity radar to measure the angle of arrival of the target signal, However, the circuit is very complicated and the design cost is high.

Utility model content

The purpose of this utility model is to fully consider the above-mentioned application requirements, and design a device with simpler circuit, stable performance, and low price, which is specially used for measuring the pattern of a compact ratio antenna.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

An antenna pattern measuring device based on all-digital high-frequency radar, including a transmitting circuit, a receiving circuit, an FPGA chip, a USB controller, and a host computer; the transmitting circuit includes a transmitting antenna, a transmitter, a DDS chip, and a phase-locked loop clock connected in sequence Synthesizer, crystal oscillator circuit; receiving circuit includes receiving antenna, analog front end, A/D conversion circuit connected in sequence; FPGA chip is connected with phase-locked loop clock synthesizer, DDS chip, transmitter, analog front end, A/D conversion circuit, The USB controller is connected; the USB controller is connected with the host computer; the phase-locked loop clock synthesizer is connected with the A/D conversion circuit.

The transmitter includes a transmitting switch and a power amplifier circuit, a transmitting antenna, a transmitting switch, a power amplifier circuit,

The DDS chips are connected sequentially; the analog front end includes a receiving switch, a filter circuit, and an amplifying circuit, and the receiving antenna, receiving switch, filtering circuit, amplifying circuit, and A/D conversion circuit are connected in sequence.

Compared with the prior art, the utility model does not use signal processing circuits such as demodulation, modulation and delay, and the overall structure of the circuit is very simple, the performance is stable, and the cost is lower.

Description of drawings

Fig. 1 is a block diagram of the utility model;

Fig. 2 is a schematic diagram of the emission principle of the present utility model;

Fig. 3 is a schematic diagram of the receiving principle of the utility model.

Detailed ways

The technical scheme of the utility model is described in detail below in conjunction with accompanying drawing and embodiment:

As shown in Figure 1, the utility model comprises transmitting circuit, receiving circuit, FPGA chip, USB controller, main frame; Transmitting circuit comprises transmitting antenna, transmitter, DDS chip, phase-locked loop clock synthesizer, crystal oscillator circuit connected successively; The receiving circuit includes a receiving antenna, an analog front end, and an A/D conversion circuit connected in sequence; the FPGA chip is connected to a phase-locked loop clock synthesizer, a DDS chip, a transmitter, an analog front end, an A/D conversion circuit, and a USB controller; The controller is connected to the host computer; the phase-locked loop clock synthesizer is connected to the A/D conversion circuit; among them, the FPGA chip and the DDS chip are all existing chips, the FPGA chip is XC6SLX150-2FGG676 produced by Xilinx, and the DDS chip is produced by ADI The AD9910.

The transmitter includes a transmitting switch and power amplifier circuit, transmitting antenna, transmitting switch, power amplifier circuit, DDS

The chips are connected in sequence; the analog front end includes a receiving switch, a filter circuit, and an amplifying circuit, and the receiving antenna, receiving switch, filtering circuit, amplifying circuit, and A/D conversion circuit are connected in sequence.

Figure 2 and Figure 3 are schematic diagrams of transmission and reception, where the receiver channel in Figure 2 corresponds to the analog front end (switch, filter, amplification) and A/D conversion in Figure 1, and the USB transmission corresponds to the FPGA in Figure 1 Transmission control module and USB controller, FFT module and scale are all implemented on the host side in Figure 1.

When in use, the transmitter is placed on a ship with a GPS recorder, and the ship can move around the antenna; the receiver is input to a part of the radar receiver and placed at a fixed point on the shore.

Claims (2)

1. the antenna pattern measurement device based on Full digital high-frequency radar, is characterized in that: comprise radiating circuit, receiving circuit, fpga chip, USB controller, main frame; Radiating circuit comprises emitting antenna, transmitter, DDS chip, phase-locked loop clock compositor, the crystal oscillating circuit connecting successively; Receiving circuit comprises receiving antenna, AFE (analog front end), the A/D change-over circuit connecting successively; Fpga chip is connected with phase-locked loop clock compositor, DDS chip, transmitter, AFE (analog front end), A/D change-over circuit, USB controller respectively; USB controller is connected with main frame; Phase-locked loop clock compositor is connected with A/D change-over circuit.

2. a kind of antenna pattern measurement device based on Full digital high-frequency radar according to claim 1, is characterized in that: described transmitter comprises emission switch and power amplifier, and emitting antenna, emission switch, power amplifier, DDS chip connect successively; Described AFE (analog front end) comprises receiving key, filtering circuit, amplifying circuit, and receiving antenna, receiving key, filtering circuit, amplifying circuit, A/D change-over circuit connect successively.