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When pulse radar signal is applied in a range limited anechoic chamber for target probing, the transmitted and reflected signal are coupled at the receiver. Interrupted transmitting and receiving (ITR) method can be used to solve this problem. However, the ideal rectangle ITR control signal is difficult to be generated by radio frequency simulation (RFS) system and the period of ITR is unstable in...
Vulse radar signal is widely used in radar countermeasure and detection. When pulse radar signal is adopted in radio frequency simulation (RFS) for radar countermeasure, the target echo will return before the pulse signal is totally transmitted because the size of anechoic chamber is small. The reflected signal and transmitted signal will be coupling and the radar countermeasure cannot be implemented...
This paper presents an X-band chirp radar transceiver with bandwidth reduction for range detection. The radar transceiver includes a super-heterodyne receiver including an ADC, a direct-digital synthesizer (DDS) based transmitter and a phase-locked loop (PLL) synthesizer. In a modified Weaver architecture, the down-converted baseband signal is further mixed with another chirp signal through stretch...
This paper presents an X-band direct digital synthesis (DDS) based chirp radar transmitter implemented in 0.13µm SiGe BiCMOS technology. The transmitter contains a quadrature DDS, two low-pass filters, an IF IQ modulator, a programmable gain amplifier (PGA), a RF mixer and a pre-amplifier. The DDSs, built with two digital-to-analog converters (DACs), generate two-channel IQ baseband chirp signals...
This paper presents an X-band chirp radar receiver with bandwidth reduction for range detection. The proposed receiver is composed primarily of a RF front end with reconfigurable bandwidth, a receiver baseband and an ADC. The receiver uses dual down-conversion architecture to convert the X-band chirp signal to the baseband signal, which is further mixed with a replica of the transmitted chirp through...
Capsule endoscopes have been proven useful to diagnose lesions along digestive tracts in recent years. However,the capsule moving through the GI tract can't be externally controlled, thus it may miss capturing important lesions. Locomotion is in urgent need for future in-vivo capsule endoscopy, and location is one of the most needed information to guide the movement of capsule inside the body. We...
This paper reviews the current status of 4H-SiC RF NPN bipolar junction transistors (BJT's). Process developments including precise and uniform SiC etch and low resistance p-type ohmic contact formation on a two inch SiC wafer will be presented. The high temperature operation up to 500degC and radiation hardness up to 1.6 Mrad, as well as RF performance promising for long-pulse UHF and L-band radar...
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