Protection device for pulse secondary radar equipment in multi-pulse environment

Abstract

The invention provides a protection device for a pulsed secondary radar device in a multi-pulse environment, and aims at providing a device which can complete the measurement task and can effectively protect the pulse secondary radar from being damaged in a multi-pulse environment. The invention is realized by the following technical scheme that a pulse secondary radar receiver carries out envelope detection of a received pulse carrier signal through a video detection circuit, performs video amplification and shaping by the video detection circuit, and performs conversion to form a high and low pulse level to an FPGA digital circuit; and in the FPGA digital circuit, the input high and low pulse level is subjected to pulse counting by a pulse counter, and the repetition frequency of the received pulse is calculated, and the pulse counter sends the calculation result to a pulse repetition frequency comparator and a fire and control circuit, comparison with the maximum safety withstand pulse repetition frequency of the pre-set pulse secondary radar in a memory is performed, the pulse repetition frequency comparator sends the comparison result to the fire and control circuit, so as to carry out the sequential control of the pulse secondary radar device.

Description

technical field [0001] The present invention relates to a kind of widely used in the radar ranging system, mainly relates to the field of radio measurement, the purpose of protecting pulse secondary radar equipment in multi-pulse environment, especially the protection device that the pulse secondary radar transmitter is not damaged . Background technique [0002] The pulses emitted by the secondary radar are in pairs, and the transmitted pulses are composed of P1, P2, and P3 pulse trains. The characteristics of the transmitted microwave signals are high power and short pulses. Due to the field effect and thermal deposition effect, the repetitive frequency high-power microwave signal will cause disturbance, saturation, instantaneous damage, degradation and even burnout. [0003] Radar often uses non-carrier pulsed electromagnetic waves as transmission signals. The pulse secondary radar equipment works in a fixed pulse repetition frequency environment. The transmitter perfor...

AI Technical Summary

Problems solved by technology

The pulse secondary radar equipment works in a fixed pulse repetition frequency environment. The transmitter performs coherent forwarding of the received pulse carrier signals one by one, and cooperates with the ground radar station to complete the system measurement task. If the multi-pulse shielding technology is not used, it will The quality of the forwarding signal is reduced, resulting in an abnormal state of the aircraft target

Once the device works in a high pulse repetition frequency or multipath environment, the transmitter still performs one-to-one coherent forwarding of the received pulses, and the total current of the device will increase due to the increase in the duty cycle of the transmitted pulse, which may easily cause damage to the device or even Burned out, seriously affecting system measurement tasks

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