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FMCW radar performance and cost

FMCW radar performance and cost. FMCW radar design. FMCW radar - key design questions: The needs of the users: Required sensitivity Range resolution Doppler capability Polarimetric capability Specification of instrument preliminary to detailed design: Dual or single antenna

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FMCW radar performance and cost

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  1. FMCW radar performance and cost

  2. FMCW radar design • FMCW radar - key design questions: • The needs of the users: • Required sensitivity • Range resolution • Doppler capability • Polarimetric capability • Specification of instrument preliminary to detailed design: • Dual or single antenna • Tx power (solid state amplifier type) • Key instrument design features to permit later upgrades: • Quality if signal • Constraints of Functionality vs Cost: • How many do we foresee being sold/deployed? • What features are likely to raise the costs above an acceptable threshold? • Target cost of instrument to customer: • <100K Euros?

  3. FMCW radar - Objectives • Radar development - activity objectives: • Maximising sensitivity to be a key objective. • Aiming to see most cloud types and fog - ~-45dBz at a range of 2km. • Range resolution should be manually selectable – depending on the target type. • (15-30 metres typically for fog) • Maximum range ~ 12 – 13 km. • Minimum near-field range ~50 metres • Doppler capability would not require additional hardware but would reduce sensitivity – • seen as a second order requirement. • Signal purity was going to be very important. • Polarimetry seen as a third order need and would require additional hardware - increasing the cost. • The radar unit needs to be rugged and robust for non-specialist users. • The radars will eventually be deployed in a range of climates – • the units will need to be weather proof, and be air-conditioned to maintain temperature control.

  4. One specification for an FMCW cloud radar The specification below is intended as an indication of the performance that can be expected from a FMCW cloud radar that makes use of components available commercially. Frequency of choice: 94 GHz Antenna configuration: Dual antenna system [30 cm diameter horn antennas] Beamwidth 0.55 degrees Transmit Power 400 mW (+26dBm) Receiver Noise Figure 6.5 dB Range resolution: 60 metres Pulse length: 1 msec Pulse Repetition Frequency: 1 kHz

  5. FMCW radar performance figures Radar sensitivity can be improved by integrating pulses so it is anticipated that: At a range of 2 km, the sensitivity would be ~ –39 dBz when integrating for 1 second. At a range of 2 km, the sensitivity would be ~ –44 dBz when integrating for 10 seconds. At a range of 10 km, the sensitivity would be ~ -37 dBz when integrating for 60 seconds.

  6. FMCW development time and cost estimates • The following estimates of development time and costs of a prototype • are for guidance only at this stage: • Development time: ~ 1 year • Development costs (components and manpower) ~ 200K Euros The objective would be to produce systems for sale at below 100K Euros

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