초록 ▼

A linear frequency-modulated pulse radar system is provided in which the echo signal is mixed with a de-ramp signal, in order to reduce the bandwidth. The transmission signal of the pulse radar and the de-ramp signal are generated with the same reference oscillator, whereby the transmission signal a

A linear frequency-modulated pulse radar system is provided in which the echo signal is mixed with a de-ramp signal, in order to reduce the bandwidth. The transmission signal of the pulse radar and the de-ramp signal are generated with the same reference oscillator, whereby the transmission signal and the de-ramp signal are generated as the upper and lower side band of an upward mixing process.

대표청구항 ▼

What is claimed is: 1. A linear frequency-modulated pulse radar system wherein an echo signal is mixed with a frequency-modulated de-ramp signal, said frequency-modulated de-ramp signal having the same chirp-rate as the transmission signal of the pulse radar and having a longer pulse duration and o

What is claimed is: 1. A linear frequency-modulated pulse radar system wherein an echo signal is mixed with a frequency-modulated de-ramp signal, said frequency-modulated de-ramp signal having the same chirp-rate as the transmission signal of the pulse radar and having a longer pulse duration and oscillating at a different mean frequency compared to the transmission signal of the pulse radar in order to reduce bandwidth, comprising a reference oscillator generating both a transmission signal of the pulse radar system and the de-ramp signal, said transmission signal and said de-ramp signal being generated as an upper and a lower side band of an upward mixing process of the signal of a signal generator whereas for generation of said transmission signal and said de-ramp signal the same mixer is used. 2. The pulse radar system according to claim 1, wherein both the upper and the lower side band can be used as the transmission signal or the de-ramp signal. 3. The pulse radar system according to claim 1, wherein the upward mixing process is set up so that one of said transmission signal and said de-ramp signal comes to lie in a Ku band, and another of said transmission signal and said de-ramp signal, in each instance, comes to lie in an X band. 4. A linear frequency-modulated pulse radar system comprising a frequency step system wherein bandwidth is increased via time-offset generation of a plurality of frequency-modulated transmission signals having different mean frequencies and wherein echo signals are mixed with a plurality of frequency-modulated de-ramp signals assigned to the individual transmission signals whereas in each case the assigned de-ramp signal has the same chirp-rate as the respective transmission signal and has a longer pulse duration and oscillates at different mean frequencies compared to the respective transmission signal, comprising a plurality of reference oscillators, a respective one of said plurality of reference oscillators generating a transmission signal and a de-ramp signal assigned to the transmission signal, said transmission signal and said de-ramp signal being generated as an upper and a lower side band of an upward mixing process in each instance, whereas for generation of said transmission signal and said de-ramp signal the same mixer is used. 5. A method of obtaining a linear frequency-modulated pulse radar system comprising the steps of: (a) generating as an upper and a lower side band of an upward mixing process a transmission signal of the pulse radar system and a frequency-modulated de-ramp signal with one reference oscillator, the frequency-modulated de-ramp signal having the same chirp-rate as the transmission signal of the pulse radar and having a longer pulse duration and oscillating at a different mean frequency compared to the transmission signal of the pulse radar; and (b) mixing an echo signal with the de-ramp signal in a mixer in order to reduce bandwidth; wherein for generation of the transmission signal and the de-ramp signal the same mixer is used. 6. The method according to claim 5 wherein both the upper and the lower side band can be used as the transmission signal or the de-ramp signal. 7. The method according to claim 5 wherein the upward mixing process is set up so that one of said transmission signal and said de-ramp signal comes to lie in a Ku band and another of said transmission signal and said de-ramp signal, in each instance, comes to lie in an X band. 8. A method of obtaining a linear frequency-modulated pulse radar system comprising a frequency step system comprising the steps of: (a) increasing bandwidth by time-offset generation of a plurality of frequency-modulated transmission signals having different mean frequencies; and (b) mixing in a mixer a plurality of echo signals with a plurality of frequency-modulated de-ramp signals assigned to the individual transmission signals; wherein a plurality of reference oscillators are provided and a respective one of the plurality of reference oscillators generates a transmission signal and a de-ramp signal assigned to the transmission signal, the transmission signal and the de-ramp signal being generated as an upper and a lower side band of an upward mixing process in each instance; wherein in each case the assigned de-ramp signal has the same chirp rate as the respective transmission signal and has a lower pulse duration and oscillates at different mean frequencies compared to the respective transmission signal; and wherein for generation of the transmission signal and the de-ramp signal the same mixer is used.