S-mode responder sidelobe suppression test method and device

Abstract

The invention discloses an S-mode responder sidelobe suppression test method and device, the test device comprises a baseband pulse generation module, a radio frequency receiving and transmitting module and a radio frequency receiving and transmitting module, and the baseband pulse generation module generates a sigma beam and a digital baseband IQ signal with power corresponding to the omega beam through methods including coding and modulation. The radio frequency transceiver module modulates a digital baseband IQ signal generated by the baseband pulse generation module to a carrier through IQ modulation, and forms a radio frequency inquiry pulse through power control and transceiver switching, so as to test the S-mode responder; or the response signal of the S-mode responder is converted into a digital baseband IQ signal through transceiving switching, power control and IQ modulation for response signal processing. The baseband receiving and processing module is used for processing response signals and counting and analyzing response results according to the digital baseband IQ signals converted by the radio frequency receiving and transmitting module. According to the invention, the relative amplitude of the sidelobe pulse can be accurately controlled.

Description

technical field [0001] The invention relates to the technical field of radar detection, in particular to a sidelobe suppression test method and device for an S-mode transponder. Background technique [0002] When the secondary radar detects the target, only the aircraft within the coverage of the interrogating main lobe beam is expected to respond, which requires the transponder to have side lobe suppression (SLS) capability. After adopting the side lobe suppression technology, the side lobe response is suppressed, further reducing asynchronous or synchronous interference. In the S mode, the interrogator uses the Σ beam and the Ω beam to radiate the interrogation pulse, and the interrogation side lobe pulse (P2 or P5) is radiated through the Ω beam. After the S mode transponder receives the interrogation pulse, it needs to undergo side lobe detection, discrimination processing, etc. to decide whether to respond or not. [0003] According to the characteristics of the frequ...

AI Technical Summary

Problems solved by technology

[0011] 1) The generation of the interrogation test pulse is complicated, requiring two signal sources (ATC test equipment) and a synchronous trigger device to generate Σ beam and Ω beam RF pulse signals respectively, and the power combination uses an analog method to generate the final interrogation test pulse;

[0012] 2) No strict synchronization method is given, and there are inherent synchronization errors between test equipment

The inconsistency of loss will lead to (P2 pulse) amplitude error, and the inconsistency of phase will affect the shape of P5 synthetic pulse, thus affecting the test results;

[0014] 4) The detection of the response signal and the specific implementation method of the response probability statistics are not given, which is inconvenient for the result statistics

Images