Process for range measurement with a pulse radar of high pulse repetition frequency

US4916452A · kind A · utility

Assignee

• AEG Aktiengesellschaft · DE

Inventors

• Wolfgang Borchert · Ulm, DE
• Franz Jehle · Ulm, DE
• Hermann Rohling · Wolfenbüttel, DE

Key dates

• Filing date: Mar 30, 1988
• Grant date: Apr 10, 1990
• Expiry date: Mar 30, 2008

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S13/24
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

With a frequency-agile pulsed doppler radar with high pulse repetition frequency (HPRF) in the unambiguous velocity region, in order to measure the range of a target the complex time signal derived from the echo signals of a coherent processing interval (CPI) is transformed into the frequency domain, the transformed spectrum is multiplied by a bandpass function with a mean frequency coinciding with the doppler frequency of the target, and the product is transformed back into a time signal. The real envelope of this re-transformed time signal displays a definite leading edge and a steady state region, from which the echo travel time can be estimated. Particular advantages may be derived for the pulsed doppler radar set from a plurality of frequency agile transmitter/receivers operated at the same time at different frequencies, and whose frequency switching times are time-staggered.