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K-MC4 Datasheet(PDF) 8 Page - RFbeam Microwave GmbH |
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K-MC4 Datasheet(HTML) 8 Page - RFbeam Microwave GmbH |
8 / 11 page K-MC4 MONOPULSE RADAR TRANSCEIVER Datasheet Using VCO and IF Outputs The IF amplifier provides two outputs per channel according to Fig. 1. These outputs are designed for different requirements in processing radar signals. Both I (imaginary) and Q (real) mixer signals are available. The I and Q signals are phase shifted by +90° or -90°, depending on the moving direction of objects in range. I1 and I2 (and Q1 and Q2) signals are phase shifted by the object deviation from the normal axis (refer to chapter Fig. 3 ). FMCW generates an output signal even without an object in range because of the finite isolation between transmitter and receiver path. This effect is called self-mixing and leads to a DC signal that depends on the carrier frequency. Example showing a single target: Triangle VCO Amplitude: 8Vpp Triangle period TM = 14ms. Modulation depth fM = 160MHz IF output freq. fb = 450Hz I_AC and Q_AC outputs show a low frequency caused by local carrier feedthrough. The superposed higher frequency fb is often called beat frequency, caused by a target at a distance of about 3m. Fig. 9: Ix and Qx Output FMCW signals with triangle VCO and df = 80MHz Distance calculation R = c 0 2 ⋅ f b f M ⋅ T M 2 = 3m approx For legend refer to Fig. 9 R Range, distance to target c0 Speed of light (3 * 108 m/s) Please contact RFbeam Microwave GmbH for more informations on FMCW and also on FSK applications Ix and Qx IF Outputs These outputs provide amplified low noise signals generated by doppler effects or FMCW. They directly can drive ADC input stages of microprocessors or DSPs. Even with 10Bit of resolution only, sensitive and relatively long range Doppler detections are possible. The outputs cover a frequency range of 15Hz ... 300kHz. 12Bit ADConverters are recommended for higher sensitivity to get optimal resolution for filtering and signal processing. © RFbeam Microwave GmbH, Schuppisstrasse 7, CH-9016 St. Gallen Page 8/11 |
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