| 摘要 |
The invention relates to a driver assistance device (2) for a vehicle (1), which driver assistance device has a radar appliance (3, 4) for determining measured variable (α1, α2, R1, R2) referenced to an object (10) that is external to the vehicle, wherein the radar appliance (3, 4) comprises: at least a first and a second reception antenna (14, 15), each for receiving signals (SE1, SE2); a first down-converter (17), which is coupled to the first reception antenna (14) via a first reception path (16), and a second down-converter (23), which is coupled to the second reception antenna (15) via a second reception path (21), for down-converting the received signals (SE1, SE2) into respective baseband signals (SB1, SB2); a control device (5) for determining the measured variable (α1, α2, R1, R2) using the baseband signals (SB1, SB2); and test means (32) for producing a local check signal (SP) and for coupling the check signal (SP) into the first reception path (16) and into the second reception path (21), as a result of which the control device (5) receives the check signal (SP) that has been down-converted by the first down-converter (17) as a first test signal (ST1) and the check signal (SP) that has been down-converted by the second down-converter (23) as a second test signal (ST2). The control device (5) uses the test signals (ST1, ST2) to determine a frequency-dependent correction variable (δ(F)) for correcting the measured variable (α, α2, R1, R2). The invention also relates to an appropriate method. |
| 主权项 |
1. A driver assistance device for a vehicle, comprising:
a radar appliance for determining at least one measured variable referenced to an object that is external to the vehicle, wherein the radar appliance comprises:
at least a first and a second reception antenna, each for receiving signals,a first down-converter, which is coupled to the first reception antenna via a first reception path, and a second down-converter, which is coupled to the second reception antenna via a second reception path, each for down-converting the received signals into respective baseband signals,a control device for receiving the baseband signals and for determining the at least one measured variable using the baseband signals, andtest means for producing a local check signal and for coupling same check signal firstly into the first reception path and secondly into the second reception path, as a result of which the control device receives firstly the check signal that has been down-converted by the first down-converter as a first test signal and secondly the check signal that has been down-converted by the second down-converter as a second test signal,wherein the control device is configured to:
use the test signals to determine a correction variable for correcting the measured variable,use the test signals to determine the correction variable as a frequency-dependent variable, andoutput to the test means a first pilot signal and a second pilot signal that has a 90° phase shift in relation to the first pilot signal, wherein the test means is configured to use the first and second pilot signals to produce the check signal. |
