Pulse radar device and method for registering, detecting and/or evaluating at least one object

• US 20050156779A1
• Filed: 12/11/2002
• Published: 07/21/2005
• Est. Priority Date: 02/27/2002
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Wixforth, Thomas
• Application Number:
  US10/503,856
• Publication Number:
  US 20050156779A1
• Time in Patent Office: Days
• US Class Current: 342/70
• CPC Class Codes: G01S 13/003 Bistatic radar systems; Multistatic radar systems
• CPC Class Codes: G01S 13/284 using coded pulses
• CPC Class Codes: G01S 13/4445 amplitude comparisons monopulse, i.e. comparing the echo signals received by an antenna arrangement with overlapping squinted beams
• CPC Class Codes: G01S 13/931 of land vehicles
• CPC Class Codes: G01S 2013/9314 Parking operations
• CPC Class Codes: G01S 2013/9315 Monitoring blind spots
• CPC Class Codes: G01S 2013/9321 Velocity regulation, e.g. cruise control
• CPC Class Codes: G01S 7/288 Coherent receivers

Abstract

In order to be able to further develop a pulse radar apparatus (100) and method for acquiring, detecting, and/or evaluating at least one object so that data can be obtained not only about the distance to the object, but also with regard to the angular position of the object to be detected, the invention has proposed that

• • the receiving antenna unit (30) of the pulse radar apparatus (100) be embodied
  • as a group antenna that has at least two antenna elements (32, 34, 36, 38) and is designed to receive the signals reflected against the object as vectorial signals and
  • that the reception branch (50) of the pulse radar apparatus (100) be followed by at least one receiving circuit (70), in particular an LF (low-frequency) receiving circuit, for evaluating and processing the received vectorial signals so that it is also possible to measure and determine the angular position of the at least one object.

Claims

1. A pulse radar apparatus (100) for acquisition, detection, and/or evaluation of at least one object, having

[a] at least one oscillator unit (20), in particular a microwave oscillator unit, for generating oscillator signals;

[b] at least one transmission branch (10) connected after the oscillator unit (20), with

[b.1] at least one emitted pulse switch unit (12), which can be acted on by the oscillator signals and is for generating pulse-modulated high-frequency signals, and

[b.2] at least one transmitting antenna unit (16), which is connected after the emitted pulse switch unit (12) and is for emitting the high-frequency signals generated by the emitted pulse switch unit (12);

[c] at least one reception branch (50), in particular an RF (radio frequency) branch, connected after the oscillator unit (20), with

[c.1] at least one receiving antenna unit (30) for receiving the signals reflected against the object,

[c.2] at least one received pulse switch unit (52, 54, 56, 58) connected after the receiving antenna unit (30), and

[c.3] at least one I/Q (inphase/quadrature) mixing unit (62, 64, 66, 68) that is connected after the receiving antenna unit (30) and is for mixing

[c.3.1] the signals, which are received by the receiving antenna unit (30) and can act on the first input connection of the I/Q mixing unit (62, 64, 66, 68),

[c.3.2] with the oscillator signals, which can act on the second input connection of the respective I/Q mixing unit (62, 64, 66, 68);

[d] at least one clock-pulse generator unit (22), in particular an LF (low-frequency) clock-pulse generator unit, for generating clock signals that can act on both the emitted pulse switch unit (12) and on the received pulse switch unit (52, 54, 56, 58); and

[e] at least one pulse delay unit (24) that is connected between the clock-pulse generator unit (22) and the received pulse switch unit (52, 54, 56, 58) and is for executing a defined time delay of the clock signals, which trigger the received pulse switch unit (52, 54, 56, 58), in relation to the clock signals, which trigger the emitted pulse switch unit (12),

characterized in that

the receiving antenna unit (30) is embodied

as at least one group antenna that has at least two antenna elements (32, 34, 36, 38) and

is designed to receive the signals reflected against the object as vectorial signals and that

the reception branch (50) is followed by at least one receiving circuit (70), in particular an LF (low-frequency) receiving circuit, for evaluating and processing the received vectorial signals so that it is also possible to measure and determine the angular position of the at least one object.

2. The pulse radar apparatus according to claim 1, characterized in that the oscillator unit (20) is followed by at least one power divider unit (18), which can distribute the oscillator signals generated by the oscillator unit (20) to the transmission branch (10) and the reception branch (50).

3. The pulse radar apparatus according to claim 1, characterized in that

the transmitting antenna unit (10) is preceded by at least one transmission amplifier unit (14) for amplifying the emitted high-frequency signals and/or that

the antenna elements (32, 34, 36, 38) of the group antenna are each followed by at least one reception amplifier unit (42, 44, 46, 48) for amplifying the signals received by the respective antenna element (32, 34, 36, 38).

4. The pulse radar apparatus according to claim 1, characterized in that the receiving circuit (70) has:

at least one low pass filter unit (72a, 74a, 76a, 78a) connected after the I (inphase) output connection of the I/Q mixing unit (62, 64, 66, 68) and

at least one low pass filter unit (72b, 74b, 76b, 78b) connected after the Q (quadrature) output connection of the I/Q mixing unit (62, 64, 66, 68), which low pass filter units (72a, 72b, 74a, 74b, 76a, 76b, 78a, 78b) are provided to filter and/or to integrate, and in particular to narrow the bandwidth of the analog broadband signals received;

at least one A/D (analog/digital) converter unit (82a, 82b, 84a, 84b, 86a, 86b, 88a, 88b), which is connected after the respective low pass filter unit (72a, 72b, 74a, 74b, 76a, 76b, 78a, 78b) and serves to convert the low pass-filtered analog signals with a relatively low scan rate into digital signals; and

at least one processor unit (90) connected after the AND converter units (82a, 82b, 84a, 84b, 86a, 86b, 88a, 88b), in particular a microprocessor unit, for digitally processing the digital signals, which are systematized in the form of complex-valued vectors or complex-valued scalars.

5. The pulse radar apparatus according to claim 1, characterized in that

the received pulse switch unit (52, 54, 56, 58) is disposed between the oscillator unit (20) and the respective I/Q mixing units (62, 64, 66, 68), or that

the respective received pulse switch unit (52, 54, 56, 58) is connected between the respective antenna element (32, 34, 36, 38) and the respective I/Q mixing unit (62, 64, 66, 68).

6. The pulse radar apparatus according to at claim 1, characterized in that

between the pulse delay unit (24) and the respective received pulse switch unit (52, 54, 56, 58), at least one MX (multiplex) unit (28) is provided for selectively triggering, preferably offset to one another in chronological order, the respective received pulse switch units (52, 54, 56, 58) with the chronologically delayed clock signals, and that

between the respective received pulse switch unit (52, 54, 56, 58) and the I/Q mixing unit (62), there is at least one power combiner unit (60), in particular an HF (high-frequency) power divider/combiner unit, for producing complex-valued scalars for the digital signal processing.

10. A use of at least one pulse radar apparatus (100) according to claim 1 and/or a method according to at claim 7 for measuring and determining the angular position of at least one object.

7. A method for acquisition, detection, and/or evaluation of at least one object, in which method oscillator signals are generated by means of at least one oscillator unit (22), in particular a microwave oscillator unit;

pulse-modulated high-frequency signals are generated by means of at least one emitted pulse switch unit (12) that can be acted on by the oscillator signals;

the high-frequency signals generated by the emitted pulse switch unit (12) are emitted by at least one transmitting antenna unit (16) that is connected after the emitted pulse switch unit (12);

the signals reflected against the object are received by at least one receiving antenna unit (30);

the signals, which are received by the receiving antenna unit (30) and can act on the first input connection of at least one I/Q (inphase quadrature) mixing unit (62, 64, 66, 68) connected after the receiving antenna unit (30), and the oscillator signals, which can act on the second input connection of the respective I/Q mixing unit, are mixed by means of the respective I/Q mixing unit (62, 64, 66, 68);

clock signals that can act on both the emitted pulse switch unit (12) and on at least one received pulse switch unit (52, 54, 56, 58) connected after the receiving antenna unit (30), are generated by at least one clock-pulse generator unit (22), in particular an LF (low-frequency) clock-pulse generator unit; and

at least one pulse delay unit (24) that is connected between the clock-pulse generator unit (22) and the received pulse switch unit (52, 54, 56, 58) executes a defined time delay of the clock signals, which trigger the received pulse switch unit (52, 54, 56, 58), in relation to the clock signals, which trigger the emitted pulse switch unit (12),

characterized in that

the signals reflected against the object are received as vectorial signals by means of at least one group antenna, which has at least two antenna elements (32, 34, 36, 38), and that

the received vectorial signals are evaluated and processed by means of at least one receiving circuit (70), in particular an LF (low-frequency) receiving circuit, so that the angular position of the at least one object is also measured and determined.

8. The method according to claim 7, characterized in that

the received analog broadband signals

are filtered and/or integrated, and particularly narrowed in bandwidth by means of at least one low pass filter unit (72a, 74a, 76a, 78a) connected after the I (inphase) output connection of the I/Q mixing unit (62, 64, 66, 68) and by means of at least one low pass filter unit (72b, 74b, 76b, 78b) connected after the Q (quadrature) output connection of the I/Q mixing unit (62, 64, 66, 68) and

are converted with a relatively low scan rate into digital signals by means of at least one AND (analog/digital) converter unit (82a, 82b, 84a, 84b, 86a, 86b, 88a, 88b), which is connected after the respective low pass filter unit (72a, 72b, 74a, 74b, 76a, 76b, 78a, 78b), and that

the digital signals, which are systematized in the form of complex-valued vectors or complex-valued scalars, are digitally processed by means of at least one processor unit (90), in particular microprocessor unit, connected after the A/D converter units (82a, 82b, 84a, 84b, 86a, 86b, 88a, 88b).

9. The method according to claim 7, characterized in that at least one MX (multiplex) unit (28), which is connected between the pulse delay unit (24) and the respective received pulse switch unit (52, 54, 56, 58), selectively triggers the respective received pulse switch units (52, 54, 56, 58), particularly in chronological order, with the time-delayed clock pulses, when the respective received pulse switch unit (52, 54, 56, 58) between the respective antenna element (32, 34, 36, 38) and the respective I/Q mixing unit (62, 64, 66, 68) is switched.