Radar apparatus supporting short and long range radar operation
Disclosed is a radar apparatus supporting short range and long range radar operations, wherein a plurality of short range transmitting chirp signals and a plurality of long range transmitting chirp signals are generated by a predetermined modulation scheme and is transmitted to an object through at least one transmitting array antenna and signals reflected from the object is received through at least one receiving array antenna, and the plurality of long range transmitting chirp signals have transmission power larger than that for the plurality of short range transmitting chirp signals.
1. A radar apparatus supporting long range and short range radar operations, comprising:
a signal processing unit configured to generate control signals for generating chirp signals used for a transceiving mode selected from the group consisting of a Short Range Radar (SRR) mode and a Long Range Radar (LRR) mode;
a transmitter configured to generate the chirp signals used for the transceiving mode based on the control signals received from the signal processing unit and a predetermined modulation scheme; and
a plurality of transmitting array antennas configured to transmit the generated chirp signals,
wherein the transmitter comprises a plurality of power amplifiers being connected to the plurality of transmitting array antennas, respectively, and configured to differently amplify transmission power of the chirp signals according to the transceiving mode.
2. The radar apparatus of claim 1 , wherein the chirp signals used for the SRR mode have a shorter detection range and a wider detection angle than chirp signals used for the LRR mode.
3. The radar apparatus of claim 1 , wherein the predetermined modulation scheme is a frequency modulated continuous-wave (FMCW) modulation scheme.
4. The radar apparatus of claim 1 , wherein the chirp signals having chirp signals used for the SRR mode and the chirp signals used for the LRR mode have different slopes of frequency with respect to time.
5. The radar apparatus of claim 4 , wherein the transmitter generates 6 or more chirp signals having different slopes of frequency with respect to time in the LRR mode, and
generates 4 or more chirp signals having different slopes of frequency with respect to time in the SRR mode.
6. The radar apparatus of claim 1 , wherein the transmitter comprises:
a frequency synthesizer configured to synthesize a frequency based on the control signals;
an oscillator configured to receive an output of the frequency synthesizer to generate a carrier signal;
a frequency multiplier configured to perform frequency multiplication of the output signal of the oscillator;
a driver configured to drive a signal of the frequency multiplier; and
the plurality of power amplifiers configured to amplify the output signal of the driver.
7. The radar apparatus of claim 1 , wherein the plurality of power amplifiers are variable gain amplifiers.
8. The radar apparatus of claim 7 , wherein the power amplifiers vary a transmitting power into two-stage or more according to the transceiving mode.
9. The radar apparatus of claim 1 , further comprising:
a plurality of receiving array antennas configured to receive reflected wave signals outputted by the plurality of transmitting array antennas and reflected by an object; and
a receiver configured to process the received reflected wave signals,
wherein the signal processing unit is configured to signal-process the processed reflected wave signals.
10. The radar apparatus of claim 9 , wherein the receiver comprises a plurality of receiving units, and
each of the receiving units includes:
a low noise amplifier configured to amplify the received reflected wave signal;
a down converting mixer configured to remove carrier component from an output of the low noise amplifier; and
a filter configured to remove noise from an output of the down converting mixer.
11. The radar apparatus of claim 9 , wherein the transmitter and the receiver are implemented in a single chip by a CMOS technology.
12. The radar apparatus of claim 9 , wherein the transmitter, the receiver and the signal processing unit are embodied by a CMOS technology and are implemented in a transmitting chip, a receiving chip and a signal processing unit chip, or implemented in a transceiving chip and a signal processing unit chip, or implemented in a single chip in which a transceiving chip and a signal processing unit chip are integrated.
13. The radar apparatus of claim 9 , wherein the plurality of transmitting array antennas and receiving array antennas are fabricated on a low temperature co-fired ceramics (LTCC) substrate.
14. The radar apparatus of claim 9 , wherein the plurality of receiving array antenna are a plurality of phase array antennas capable of detecting an azimuth angle of the object.